My older brother had a friend who did electronics and one day he explained voltage, current and some basic components by comparing it with plumbing. It has stayed with me for well over 40 years. I know its common, but for me the visualisation was very powerful.
Good point about learning by looking at things. This was my experience too: i.e.., recognized components before understanding anything deeply. My dad worked for Allen-Bradley nearly all his life and would bring components home for me. I'm still working through resistors he gave me in the '80s, from work. He passed away more than 30 years ago and would be over the moon to know what I've repaired with them. :)
Years ago while I was playing with my new multimeter I discovered that I could create resistors of various values with the carbon lines of a number two pencil on a sheet of paper. Copper and silver will mark on paper as well so I guess it would be possible to make a working circuit, say a receiver. Might be cool. Transistors and such might be problematic. Imagine a schematic that you could apply voltage to and make it work.
I am so pleased to find that there are others who stare at resistors. I stare at capacitors too, but mainly at my AVR microcontrollers. Is there a help group I can join ?
I did the same as a kid, over 40 years ago, I was taking everything apart. I wanted to know what things were and I slowly learned as I went. There were some parts that confused me for awhile, because they could be wildly different looking. Then I got my first electronics kit, the kind with all the spring terminals and you wire up different circuits. I really started learning what those parts did and how they worked, and I learned all the schematic symbols. Then one day I picked up a broken copy machine, and my first exposure to surface mount parts. It really was amazing to me at the time. It took quite a bit of time to finally learn what they were.
All the sockets of my 1/2" drive socket-set are *resistor paint* *color* *coded* : BLK for 10mm, 20mm 30mm RED for 12 & 22 & 32 mm GRN for 15 /25mm sure you get what I mean. You can't imagine how easy that makes it to quickly find the one you want without having to pick them up one at the time and read the size numbers
When I was young as a hobbyist with good eyes, I had an ice cream container full of random value resistors. I could rummage through and instantly identify any value with the colours. Now even with glasses I need to measure every resistor with my meter.
I saw a new kind I never saw on EEBlog where he was tearing down a boom box. They were called MELF resistors. Basically the old through-hole type with the leads chopped off.
We both have a similar path to electronics in our early age. I loved going to the surplus places and the WW II stuff was great to study and mess with. I don't know how many times the insides of an old tube radio bit or burned me. You eventually learn what not to touch. But your right once I started a formal education in the field I was far a head of the pack by all that early fascination. 👍
In my early teen years, Philips made experimenting boxes. I had an EE 1050 and EE 1052. There were resistors, capacitors, transistors, an LDR, a potentiometer and like two dozen of circuits to try out on a frame. Very educational. I learnt the resistor color codes this way.
Another resistor story: my first job out of school was at Teradyne, and there was a very senior EE who decided resistor power ratings were bullshit so he embarked on a test-to-destruction data gathering campaign to determine power ratings to *his* satisfaction. The reason he did this was (according to legend) he decided to make his own heated gloves to wear when riding his BMW to work in Boston in the winter and one day he walked in to work with his hands all blackened.
Power ratings aren't BS but you definitely need to understand how things work in real circuits. The power rating of a resistor is usually based on the maximum allowable temperature and of course temperature rise is a function of power input and the rate of heat removal. The structure of the resistor plays a big role. In a thin film resistor, for example, the actual resistive element is only a very small fraction of the total package size, so it is very dependent on getting heat from that thin element to the package. With carbon composition resistors the element is a substantial fraction of the overall package volume. Wirewound resistors fall somewhere in between. I've often designed to operate a resistor well below its rated power, not out of concern for the resistor itself but out of concern for the printed circuit board. Anyone who has been in electronics for long has seen PCBs charred under power resistors or around the pads to which the leads of such a resistor are soldered. That can be life-limiting for the product. These days you can get things like 5 watt SM resistors. Woe betide you if you don't pay close attention to adequate heat removal, which can be a big challenge. I've also greatly "under run" resistors in precision analog circuitry. This is because the self-heating of a resistor, even when the power dissipated is very small and the resistor has a low temperature coefficient of resistance can be enough to degrade the performance of the circuit. In some circumstances it's OK to run a resistor so hot it glows dull red. Years ago I ran across a datasheet for a Philips wire-wound resistor that specified the power rating at a maximum "room temperature" of, iirc, 300 °C. I used to use Philips CR25 carbon film resistors for most general work. They were quite impressive. You could typically run one at such high power that the insulating lacquer would burn off and find the resistor to still be within its specified tolerance.
At a place I worked long ago there were three guys who hung out together and they were each colour-blind. Between them they had a system to work out what a colour was.
Please consider rethinking the camera setup. Those fancy cameras, with shallow depth of field, set on automatic focus, make for a challenging watching experience.
I got some advice in a video to get 8ohm non-inductive resistors for audio output dummy loads. They were a bit hard to find as wire wound is so common. I bought two. The need for non-inductive was to prevent inductive feedback screwing up the audio output. I haven't actually used them yet. They are 100W. A good value for the ohms since I can parallel them to 4ohms or series to get 16ohms. I desperately need to build a workshop table. And new glasses, since I just can't see well enough up close anymore. Old age sucks. But the added experience is nice! Thanks for the useful video.
I'm an old man like you. Those little thin-film or composition resistors - I keep the ohmmeter handy because I'm ridiculously color-blind. I recall explaining to the lab TA for the practical in my first formal electronics course that I can interpret the color-code - tell me the bands and I'll tell you the value - but I can't distinguish all the colors. He had a real problem with that. The high-current wire-wound reisstors in the axial-lead packages are usually also distinguished by having a double-width first band. A lot of the high-precision resistors also specify their temperature coefficients and get used in temperature compensation circuits. I've seen 100 MΩ resistors built into long glass insulators with the corrugations for flashover prevention. They were used in voltage dividers to measure multi-kilovolt anode voltages in exotic vacuum devices. (Helical TWT's, maybe? It's been years.) What sort of label maker are you using that does Greek letters? I'm looking at getting another label maker since the tape in my old one keeps jamming (cleaning didn't help) and it would be nice to be able to label resistor boxes like yours.
I need to stop thinking I have anything ontop of anyone else once the secrets out. and then just make sure they know about it so theres no secret anymore.
Its all related to the opportunities offered to you at the time. I wanted to attend an engineering college. Due to a serious disability I could not travel to a far off campus thus I used my local Suny Albany University. At the time it only had what is called Software Engineering and though I started in the major I was soon a convert to the math major and spent the rest of my time at Universities going thru the three degreed programs. Had things been different it very well might have been Electronics. Do I miss not having gone thru an EE program? Yes, but I would not trade. I'd go for both if I had the patience and devotion to cause or aim to do both well.
Did you noticed than modern resistors have thinner leads than those old ones? On every kit I buy, I mostly use old resistors (even salvaged ones) instead those that came in the kit. Back in late 80s and 90s when SMD components were hard to get, I used resistors with cut leads like SMD, when I made circuits that I wanted to be very small.
My high school shop teacher, too. I hate the sexism and misogyny of it. There are other mnemonic phrases that aren't as awful, but I can't remember any. Here's how I remember the colors: it goes black, brown, because black is nothing (zero) and brown is slightly brighter. Then it's the colors of the rainbow ROYGBV (indigo isn't real so it's not there), then grey and white because white is all the colors so it's 9, and grey is almost 9, hence 8. This isn't nearly as snappy a mnemonic but it works for me. At this point in life I just know the colors instead of using the mnemonic, but it's what got me to that point of memorization.
@@stephentrier5569 the problem is, memorability is crucial. steven jay gould wrote about this, relating to teaching the names of geologic time periods.
Steel end caps and leads on small resistors have been common for a very long time. There are no particular issues with them in terms of longevity in-circuit. They are much harder than copper so you want to avoid using your $100 precision cutters on them. Steel leads don't conduct heat nearly as well as copper leads. That can be either an advantage or a disadvantage. The low thermal conductivity means it is harder to transfer heat to the foils of a circuit board, resulting in the resistor itself running hotter but protecting the PCB from excessive heat that can eventually damage the board.
@@d614gakadoug9 thanks for the time you spent writing this. My main concern regards galvanic corrosion: dissimilar metals like copper and iron (or steel, for that matter) do not go well together and their union will result in the slow corrosion of one of the two. I am not sure if covering both with solder, or even coating them with a thin polymeric layer can prevent the degradation due to the different electrochemical potential. What I know is that when I used one of these iron terminals to experiment with a circuit under water , the terminal dissolved like a biscuit in hot tea. I am kind of sensitive to this because I am about to encase a dozen temperature sensors in concrete (inside a protective tubing) and bury them under a sidewalk where they will no longer be accessible. Risking the iron terminals to dissolve after a few years is not an option
AUDIO SUGGESTION: I want to help you... What software are you using to edit your videos?.... (I'm gonna get you the solution to your one sided sound....)
I tried to get more efficient with my video editing and made a master file with all my normal settings. each time I use this file as a starting point. many videos later, someone pointed out the 50% pan to right. Oh no.... I had made a bunch of videos with this new master file and it would be too much work to go back and re-do each file. So much for efficiency 😕
My university professor shared a story where a Ph.D. candidate asked the prof. if it mattered which direction that the resistor was inserted!? It is true that much practical knowledge comes from tinkering with electronic stuff at an early age. Thank you for the informational video.
Since it was an episode for beginners here’s a beginners question… What dictates the values of the resistors? Specifically, why are there 4.7k, 1.1k, etc? There must be a reason because as you were showing the vintage resistors, that had the same values. Good video, I’ve been wanting to ask that for a while and the explanations I found on the internet changed as I changed sites. Thanks
Keeping math simple, standard resistor values are mathematically derived so that their values are spaced at about twice the tolerance. So for 10% resistors, if one resistor has resistance value of R, the next value in the series will be around 1.2*R. The actual values are chosen so that the series repeats every decade.
Inrush current reduction, contact spark supression (with capacitor), accuracy unnecessary. The best one I'd seen is 47 ohm 25W yellow one used in an "RF Dummy Load", to win a bet
Often then general description of the resistor in the circuit would be "burn off a bunch of energy that would be inconvenient in other places in the circuit." As another example... I have a nice linear power supply where the overall goal is to start with a brute-force supply at the input providing the maximum voltage we'll ever need, and then use a transistor (or two) to chew up enough current to get the desired voltage at the output. If the difference between the input and output voltages is very high, lots of power needs to be dropped. The transistor(s) can do it, but it would be nice to not push them so hard, to keep them from running so hot. So... a little circuit sort of off to the side that passes a big chunk of that current through a big-old power resistor that lives on the back panel of the chassis, dissipating a lot of that energy as heat, thus reducing the load on the transistor. So, yes... small space heater. :)
@@ydonl That is brilliant! I think if I had been able to read your message a few weeks ago I would've felt differently about it than I do now. I would have said "ahhh, that's a big waste, use a SMPS!" Now, I just spent a bunch of time and money unsuccessfully attempting to fix the faulty power supply in a Tek 2235A I bought on eBay. Now I wish it had a nice, simple, linear power supply like that with a big honking oversized transformer built to last!
@@chongli297Well, the parallel resistor is a Power Designs concept; very nice linear, hot, sorta heavy, (but not really), precise, wonderful power supplies. For a Tek, I think I'd try to keep it sort of original, just out of respect. The 7904 supply is pretty funky... early switcher before switches became normal. Tick tick tick... Pop! There goes another tantalum! I haven't looked at the "newer" ones.
Why would you ever need a 50 mega ohm in that large size. A 50 meg resistor is going dissipate a tiny fraction of a watt even at high voltage so it could be a lot smaller.
I believe all students should be introduced to resistors in elementary or middle school instead of New Resistors the woke programs are teaching. Also teach them life’s a circuit if I had known that back then I’d be a lot further along today then I am now.
@@PatientZiro I know right. It’s going to be a great cartoon series I’ve been working on. Common components being separated and replaced by SMD CoNponets. I call it Make Analog Great Again.
The camera is looking for contrasty edges while it's trying to focus. So... having those little drawers in the background was not helping you! :-) Nice vid. I especially liked the Julie Research 4-wire. Nice stuff!
Hi Imsay, nice video for beginners 🤔 I just wanted to ask what exactly is the resistor 🤔 what does it actually do, how does it work, how should I choose the value, how many Watts. 🤔 I need to get those orange resistors, they will go well with my black PCB in the new project 😁 and my wife's dress 😂 I'll have to buy those small boxes too, I'm old THT school, I do use SMD too, but so far I only have them in my belts and I also have a lot of them stored in the carpet 🤣 sometimes I even tried to find them 🤣 Nice day 🙂 Tom
ask every question you just asked, but individually on google. one by one, and you will get all the answer you need. you can even search the answer in youtube and your most likely to find the answer too more in depth.
@@originsdecoded3508 In case you didn't get it, it was all meant as a joke, ,hence the smileys. I've been dealing with electronics for more than 50 years, so I think I've already seen some resistance (including resistance to work) 😁 I'm just such a prankster Nice day 😁 Tom
@@IMSAIGuy Not a common thing today. They sometimes used for pulse load applications or when you need higher operating voltage in small SMD package. Also there is low inductance series from Vishay for high frequency operation. BTW the smallest MELF package fits in 0805 footprint.
High voltage, also very small current measuring in devices such as electrometers. They can get even higher, at these resistances leakage currents on pcbs and fingerprints become issues that can reduce the resistance and screw up measurments. If you are interested, look up "Electrometer schematic" and go to images, some schematics show 500G resistors!
The glass-cased ones, showed here, designed for measurements application. It rated only 100V and it's power rating even not specified by developer/manufacturer.
One use for high-value resistors is in a transimpedance amplifier. Mr. Ohm tells us that voltage = current * resistance. So suppose you have a very small current, and you want to measure it by turning it into a voltage. The very small current, times a very large resistance, will give a reasonable voltage that can be fairly easily measured. If you know how big the resistance is, you can divide the voltage by it, and find out what the current was. So if I want to be able to measure at about a 1 volt level, because that's what I can measure accurately, a 40G resistance lets me work with a current of 25 picoamps. Tiny. A mere 156 million electrons per second! Generally speaking... since resistance is the ratio of voltage to current, anytime that ratio is very high (high voltage / low current), the resistance involved is very high.
For historical purposes only: en.wikipedia.org/wiki/List_of_electronic_color_code_mnemonics#:~:text=The%20following%20historical%20mnemonics%20are,girls%20behind%20victory%20garden%20walls.
![[#2024MAMA] G-DRAGON - 무제(Untitled, 2014)+POWER+HOME SWEET HOME+뱅뱅뱅+FANTASTIC BABY | Mnet 241123 방송](http://i.ytimg.com/vi/Ox29z5Nf1Uk/mqdefault.jpg)
SMD boxes: search ebay for 'smd mini container'
In german they are called Mäuseklo or mouse loo in english
My older brother had a friend who did electronics and one day he explained voltage, current and some basic components by comparing it with plumbing. It has stayed with me for well over 40 years. I know its common, but for me the visualisation was very powerful.
Good point about learning by looking at things. This was my experience too: i.e.., recognized components before understanding anything deeply. My dad worked for Allen-Bradley nearly all his life and would bring components home for me. I'm still working through resistors he gave me in the '80s, from work. He passed away more than 30 years ago and would be over the moon to know what I've repaired with them. :)
Years ago while I was playing with my new multimeter I discovered that I could create resistors of various values with the carbon lines of a number two pencil
on a sheet of paper. Copper and silver will mark on paper as well so I guess it would be possible to make a working circuit, say a receiver.
Might be cool.
Transistors and such might be problematic.
Imagine a schematic that you could apply voltage to and make it work.
I am so pleased to find that there are others who stare at resistors. I stare at capacitors too, but mainly at my AVR microcontrollers. Is there a help group I can join ?
One of the first color codes I learned is : BAD BEER ROTS OUR YOUNG GUTS BUT VODKA GOES WELL .
BAD BOYS R@PE OUR YOUNG GIRLS BUT VIOLET GIVES WILLINGLY
I did the same as a kid, over 40 years ago, I was taking everything apart. I wanted to know what things were and I slowly learned as I went. There were some parts that confused me for awhile, because they could be wildly different looking. Then I got my first electronics kit, the kind with all the spring terminals and you wire up different circuits. I really started learning what those parts did and how they worked, and I learned all the schematic symbols. Then one day I picked up a broken copy machine, and my first exposure to surface mount parts. It really was amazing to me at the time. It took quite a bit of time to finally learn what they were.
All the sockets of my 1/2" drive socket-set are *resistor paint* *color* *coded* : BLK for 10mm, 20mm 30mm RED for 12 & 22 & 32 mm GRN for 15 /25mm sure you get what I mean.
You can't imagine how easy that makes it to quickly find the one you want without having to pick them up one at the time and read the size numbers
When I was young as a hobbyist with good eyes, I had an ice cream container full of random value resistors. I could rummage through and instantly identify any value with the colours. Now even with glasses I need to measure every resistor with my meter.
I saw a new kind I never saw on EEBlog where he was tearing down a boom box. They were called MELF resistors. Basically the old through-hole type with the leads chopped off.
We both have a similar path to electronics in our early age. I loved going to the surplus places and the WW II stuff was great to study and mess with. I don't know how many times the insides of an old tube radio bit or burned me. You eventually learn what not to touch. But your right once I started a formal education in the field I was far a head of the pack by all that early fascination. 👍
In my early teen years, Philips made experimenting boxes. I had an EE 1050 and EE 1052. There were resistors, capacitors, transistors, an LDR, a potentiometer and like two dozen of circuits to try out on a frame. Very educational. I learnt the resistor color codes this way.
Another resistor story: my first job out of school was at Teradyne, and there was a very senior EE who decided resistor power ratings were bullshit so he embarked on a test-to-destruction data gathering campaign to determine power ratings to *his* satisfaction. The reason he did this was (according to legend) he decided to make his own heated gloves to wear when riding his BMW to work in Boston in the winter and one day he walked in to work with his hands all blackened.
Power ratings aren't BS but you definitely need to understand how things work in real circuits.
The power rating of a resistor is usually based on the maximum allowable temperature and of course temperature rise is a function of power input and the rate of heat removal. The structure of the resistor plays a big role. In a thin film resistor, for example, the actual resistive element is only a very small fraction of the total package size, so it is very dependent on getting heat from that thin element to the package. With carbon composition resistors the element is a substantial fraction of the overall package volume. Wirewound resistors fall somewhere in between.
I've often designed to operate a resistor well below its rated power, not out of concern for the resistor itself but out of concern for the printed circuit board. Anyone who has been in electronics for long has seen PCBs charred under power resistors or around the pads to which the leads of such a resistor are soldered. That can be life-limiting for the product. These days you can get things like 5 watt SM resistors. Woe betide you if you don't pay close attention to adequate heat removal, which can be a big challenge.
I've also greatly "under run" resistors in precision analog circuitry. This is because the self-heating of a resistor, even when the power dissipated is very small and the resistor has a low temperature coefficient of resistance can be enough to degrade the performance of the circuit.
In some circumstances it's OK to run a resistor so hot it glows dull red.
Years ago I ran across a datasheet for a Philips wire-wound resistor that specified the power rating at a maximum "room temperature" of, iirc, 300 °C.
I used to use Philips CR25 carbon film resistors for most general work. They were quite impressive. You could typically run one at such high power that the insulating lacquer would burn off and find the resistor to still be within its specified tolerance.
I first learned I was color blind when I kept having to ask my family what colors the bands were on various resistors.
I can relate because I asked my son what color the bands were and found out he was also color blind.
At a place I worked long ago there were three guys who hung out together and they were each colour-blind. Between them they had a system to work out what a colour was.
@@jagmarc That’s Awesome.
I stare at where the smd resistor was before I sneezed.
Great collection.
Please consider rethinking the camera setup. Those fancy cameras, with shallow depth of field, set on automatic focus, make for a challenging watching experience.
I got some advice in a video to get 8ohm non-inductive resistors for audio output dummy loads. They were a bit hard to find as wire wound is so common. I bought two. The need for non-inductive was to prevent inductive feedback screwing up the audio output. I haven't actually used them yet.
They are 100W. A good value for the ohms since I can parallel them to 4ohms or series to get 16ohms. I desperately need to build a workshop table. And new glasses, since I just can't see well enough up close anymore. Old age sucks. But the added experience is nice!
Thanks for the useful video.
A great video on resistors 👍 Should be required viewing for every first year electronics course.
Generally, if I take something apart it's automatically broken afterwards. It generally goes frome a fact finding mission to a rescue mission.
Hi, great videos thanks. Thought I would let you know though, that your audio in your last two videos is Right channel only.
I'm an old man like you.
Those little thin-film or composition resistors - I keep the ohmmeter handy because I'm ridiculously color-blind. I recall explaining to the lab TA for the practical in my first formal electronics course that I can interpret the color-code - tell me the bands and I'll tell you the value - but I can't distinguish all the colors. He had a real problem with that.
The high-current wire-wound reisstors in the axial-lead packages are usually also distinguished by having a double-width first band.
A lot of the high-precision resistors also specify their temperature coefficients and get used in temperature compensation circuits.
I've seen 100 MΩ resistors built into long glass insulators with the corrugations for flashover prevention. They were used in voltage dividers to measure multi-kilovolt anode voltages in exotic vacuum devices. (Helical TWT's, maybe? It's been years.)
What sort of label maker are you using that does Greek letters? I'm looking at getting another label maker since the tape in my old one keeps jamming (cleaning didn't help) and it would be nice to be able to label resistor boxes like yours.
Brother P-touch
I need to stop thinking I have anything ontop of anyone else once the secrets out. and then just make sure they know about it so theres no secret anymore.
Its all related to the opportunities offered to you at the time. I wanted to attend an engineering college. Due to a serious disability I could not travel to a far off campus thus I used my local Suny Albany University. At the time it only had what is called Software Engineering and though I started in the major I was soon a convert to the math major and spent the rest of my time at Universities going thru the three degreed programs.
Had things been different it very well might have been Electronics. Do I miss not having gone thru an EE program? Yes, but I would not trade. I'd go for both if I had the patience and devotion to cause or aim to do both well.
Did you noticed than modern resistors have thinner leads than those old ones? On every kit I buy, I mostly use old resistors (even salvaged ones) instead those that came in the kit.
Back in late 80s and 90s when SMD components were hard to get, I used resistors with cut leads like SMD, when I made circuits that I wanted to be very small.
Not only that, but some of the real cheap components have copper coated steel, just get out a magnet and see if some of them stick !!!
My HS shop teacher taught us "Bad Boys R*** Our Young Girls But Violet Goes Willingly"
Close to the one I know!
My high school shop teacher, too. I hate the sexism and misogyny of it.
There are other mnemonic phrases that aren't as awful, but I can't remember any. Here's how I remember the colors: it goes black, brown, because black is nothing (zero) and brown is slightly brighter. Then it's the colors of the rainbow ROYGBV (indigo isn't real so it's not there), then grey and white because white is all the colors so it's 9, and grey is almost 9, hence 8. This isn't nearly as snappy a mnemonic but it works for me. At this point in life I just know the colors instead of using the mnemonic, but it's what got me to that point of memorization.
@@andymouse behind victory garden walls
@@stephentrier5569 the problem is, memorability is crucial. steven jay gould wrote about this, relating to teaching the names of geologic time periods.
Nope :)@@nickcaruso
The cheapest resistors on ebay and amazon have iron terminals. I wonder what that would do long term to a circuit once soldered to copper PCBs.
Steel end caps and leads on small resistors have been common for a very long time. There are no particular issues with them in terms of longevity in-circuit. They are much harder than copper so you want to avoid using your $100 precision cutters on them.
Steel leads don't conduct heat nearly as well as copper leads. That can be either an advantage or a disadvantage. The low thermal conductivity means it is harder to transfer heat to the foils of a circuit board, resulting in the resistor itself running hotter but protecting the PCB from excessive heat that can eventually damage the board.
@@d614gakadoug9 thanks for the time you spent writing this. My main concern regards galvanic corrosion: dissimilar metals like copper and iron (or steel, for that matter) do not go well together and their union will result in the slow corrosion of one of the two. I am not sure if covering both with solder, or even coating them with a thin polymeric layer can prevent the degradation due to the different electrochemical potential. What I know is that when I used one of these iron terminals to experiment with a circuit under water , the terminal dissolved like a biscuit in hot tea.
I am kind of sensitive to this because I am about to encase a dozen temperature sensors in concrete (inside a protective tubing) and bury them under a sidewalk where they will no longer be accessible. Risking the iron terminals to dissolve after a few years is not an option
Thank you for teaching us this wizardry, its the real magic.
The box for holding the SMD resistors is nice. Please send us the make and model of it or a website link of it.
search ebay for 'smd mini container'
AUDIO SUGGESTION: I want to help you... What software are you using to edit your videos?.... (I'm gonna get you the solution to your one sided sound....)
I tried to get more efficient with my video editing and made a master file with all my normal settings. each time I use this file as a starting point. many videos later, someone pointed out the 50% pan to right. Oh no.... I had made a bunch of videos with this new master file and it would be too much work to go back and re-do each file. So much for efficiency 😕
Great title, reminds me of the great movie and an even better book!
My university professor shared a story where a Ph.D. candidate asked the prof. if it mattered which direction that the resistor was inserted!? It is true that much practical knowledge comes from tinkering with electronic stuff at an early age. Thank you for the informational video.
The obvious question is: did he get his doctorate?
@@IMSAIGuy I'm not sure because names were not used. Having said that, I highly suspect that at least one professor was biased against the candidate.
@@k.c.sunshine1934Perhaps he did get his PhD, and went into AudioPhoolery. :-)
Yea I'd like to know where you got those boxes for the SMD resistors too!
search ebay for 'smd mini container'
Show me your Vishay Bulk Metal Foil Resistors!
I've got some, not much to look at (black rectangle), but they have a good heart
Nice resistors, but rather expensive!
Since it was an episode for beginners here’s a beginners question…
What dictates the values of the resistors? Specifically, why are there 4.7k, 1.1k, etc? There must be a reason because as you were showing the vintage resistors, that had the same values. Good video, I’ve been wanting to ask that for a while and the explanations I found on the internet changed as I changed sites. Thanks
www.rfcafe.com/references/electrical/resistor-values.htm
Keeping math simple, standard resistor values are mathematically derived so that their values are spaced at about twice the tolerance. So for 10% resistors, if one resistor has resistance value of R, the next value in the series will be around 1.2*R. The actual values are chosen so that the series repeats every decade.
Sounds like a scene out of Monty Python !!! My people tease me for looking at "electronics porn"🤣
www.imdb.com/title/tt1234548/
When I was a kid, my resistors had much shorter leads. ;)
yours had leads? I had to add mine. 😎
...hmmm, why do I feel surprised that this video involves no goats...?!?
I too love the 0805 !
Nice video (as usual ;-)) Where did you buy these nice boxes for the SMD-resistors? I might need some.
search ebay for 'smd mini container'
@@IMSAIGuy thanks, that worked.
11:31 Nice to see Soviet KVM resistors there.
What would you use one of those low-value, inaccurate, high-wattage resistors for? Small space heater?
Inrush current reduction, contact spark supression (with capacitor), accuracy unnecessary.
The best one I'd seen is 47 ohm 25W yellow one used in an "RF Dummy Load", to win a bet
Often then general description of the resistor in the circuit would be "burn off a bunch of energy that would be inconvenient in other places in the circuit."
As another example... I have a nice linear power supply where the overall goal is to start with a brute-force supply at the input providing the maximum voltage we'll ever need, and then use a transistor (or two) to chew up enough current to get the desired voltage at the output. If the difference between the input and output voltages is very high, lots of power needs to be dropped. The transistor(s) can do it, but it would be nice to not push them so hard, to keep them from running so hot. So... a little circuit sort of off to the side that passes a big chunk of that current through a big-old power resistor that lives on the back panel of the chassis, dissipating a lot of that energy as heat, thus reducing the load on the transistor.
So, yes... small space heater. :)
Do you mean "fixed ballast to variable linear dissipation element"? @@ydonl
@@ydonl That is brilliant! I think if I had been able to read your message a few weeks ago I would've felt differently about it than I do now. I would have said "ahhh, that's a big waste, use a SMPS!" Now, I just spent a bunch of time and money unsuccessfully attempting to fix the faulty power supply in a Tek 2235A I bought on eBay. Now I wish it had a nice, simple, linear power supply like that with a big honking oversized transformer built to last!
@@chongli297Well, the parallel resistor is a Power Designs concept; very nice linear, hot, sorta heavy, (but not really), precise, wonderful power supplies. For a Tek, I think I'd try to keep it sort of original, just out of respect. The 7904 supply is pretty funky... early switcher before switches became normal. Tick tick tick... Pop! There goes another tantalum! I haven't looked at the "newer" ones.
Why would you ever need a 50 mega ohm in that large size. A 50 meg resistor is going dissipate a tiny fraction of a watt even at high voltage so it could be a lot smaller.
high voltage breakdown
I believe all students should be introduced to resistors in elementary or middle school instead of New Resistors the woke programs are teaching. Also teach them life’s a circuit if I had known that back then I’d be a lot further along today then I am now.
New Resistors 😂
@@PatientZiro I know right. It’s going to be a great cartoon series I’ve been working on. Common components being separated and replaced by SMD CoNponets. I call it Make Analog Great Again.
Imagine their faces when learning the color chart and finding that white equals 9 and black is 0.
@@joseppuig925 Reeeeeeeeee.
similar childhood.
The camera is looking for contrasty edges while it's trying to focus. So... having those little drawers in the background was not helping you! :-)
Nice vid. I especially liked the Julie Research 4-wire. Nice stuff!
I.G. the focus will probably come out better if you put your hand behind the object that you‘re showing.
Love the title! 🤣 🤣 🤣
Hi Imsay, nice video for beginners 🤔 I just wanted to ask what exactly is the resistor 🤔 what does it actually do, how does it work, how should I choose the value, how many Watts.
🤔 I need to get those orange resistors, they will go well with my black PCB in the new project 😁 and my wife's dress 😂
I'll have to buy those small boxes too, I'm old THT school, I do use SMD too, but so far I only have them in my belts and I also have a lot of them stored in the carpet 🤣 sometimes I even tried to find them 🤣
Nice day 🙂 Tom
ask every question you just asked, but individually on google. one by one, and you will get all the answer you need. you can even search the answer in youtube and your most likely to find the answer too more in depth.
@@originsdecoded3508 Google 🤔 I don't know such a component
@@Edisson. its not a component, but a wave function. you just type it.
@@originsdecoded3508 In case you didn't get it, it was all meant as a joke, ,hence the smileys. I've been dealing with electronics for more than 50 years, so I think I've already seen some resistance (including resistance to work) 😁 I'm just such a prankster
Nice day 😁 Tom
@@Edisson. how come you still watch this beginning learning videos if you have 50 yrs of experience? or u still have more you wanna learn?
Are MELFs still a thing ?
I hope not
@@IMSAIGuy Not a common thing today. They sometimes used for pulse load applications or when you need higher operating voltage in small SMD package. Also there is low inductance series from Vishay for high frequency operation.
BTW the smallest MELF package fits in 0805 footprint.
Hello.😊
I didn't know there was a 40G Ohm resistor! 🤯
What kinds of applications are these super high values used for? 🤔
High Voltage divider
High voltage applications in the kV range would be one way to use them. Like a high voltage divider or RC snubber resistor.
High voltage, also very small current measuring in devices such as electrometers. They can get even higher, at these resistances leakage currents on pcbs and fingerprints become issues that can reduce the resistance and screw up measurments. If you are interested, look up "Electrometer schematic" and go to images, some schematics show 500G resistors!
The glass-cased ones, showed here, designed for measurements application. It rated only 100V and it's power rating even not specified by developer/manufacturer.
One use for high-value resistors is in a transimpedance amplifier. Mr. Ohm tells us that voltage = current * resistance. So suppose you have a very small current, and you want to measure it by turning it into a voltage. The very small current, times a very large resistance, will give a reasonable voltage that can be fairly easily measured. If you know how big the resistance is, you can divide the voltage by it, and find out what the current was.
So if I want to be able to measure at about a 1 volt level, because that's what I can measure accurately, a 40G resistance lets me work with a current of 25 picoamps. Tiny. A mere 156 million electrons per second!
Generally speaking... since resistance is the ratio of voltage to current, anytime that ratio is very high (high voltage / low current), the resistance involved is very high.
U'r fired any way! 5min late! yup! great video as always!
love little Jimmy's play house! glad to see U got u'r allowance!
you must be grow up in megacity Sir
no, was raised in a very remote small town
For historical purposes only: en.wikipedia.org/wiki/List_of_electronic_color_code_mnemonics#:~:text=The%20following%20historical%20mnemonics%20are,girls%20behind%20victory%20garden%20walls.
Did you throw away all of your way out of tolerance carbon comp resistors?
@@davebleamwa2bxy799 My resistors all believe in Diversity, Inclusion and Equity.