Circuit Skills: Power Supply
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- Опубликовано: 29 авг 2011
- Find more at the Maker Shed: makershed.com
The requisite starting point for anything electronic - you won't get much blinking, buzzing, or processing done without a power supply!
Learn more here:
makezine.com/video/circuit-ski... 
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Ive been coming back to Colin's videos since I was a 15 year-old when these videos were first released... Thank you Colin for helping me realise my love of engineering!
I love it when I click on one of these videos.
As soon as I hear the familiar background music, I immediately pause it, turn the TV to mute, and get comfortable.
You always know you're going to learn something interesting!
Collin Cunningham's videos never cease to impress, entertain or enlighten. He speaks with a cadence that is both patient and lucid. Frankly: I could only wish everyone was as good a teacher as he is.
This is how to make RUclips videos. If your RUclips is over 10 minutes, you need to re-think it. I stumbled on these just last week. These are probably the best on electronics out there. I have viewed other popular ones, but who has time for 30-60 minutes on a topic that can be effectively covered in the time Collin does these? This one is 7 years old. It is still relevant. I hope he still makes videos. They are engaging, provide the information I am looking for, and don't consume extraordinary amounts of time like others. Thanks Collin - 7 years after you made this.
Colin, you have style. Loving your work. Half the time I don't even care about what you're building, I just like your presenting. OK, so I do care about what you're building...
Collin, your videos are excellent. Your presentation style is very clear and easy to understand, thanks!
Awesome as ever, probably the only reason why I'm still subscribed to this channel.
he has the most relaxed way of teaching i have ever seen, and i love it!
You and your videos are awesome man! Also, watching you talk about something you're passionate about is so attractive
Colin! Where did you go? Your videos have alway been my favorite to learn or develop electronics from. "Make" some more please :)
Thanks Colin...I'm a musician (not my day job) that got bit by the DIY bug. On top of that, I found out how much the bits of gear cost to build as compared to the butt raping retail that places like Guitar Center charge and looking inside at the circuitry, I realized that this stuff isn't that complex. You, and a few other RUclipsrs are my bridge to realizing my dream of building my own preamps, power amps, stompboxes, pedal board switching loops ...you get the idea.
Have you published any books or manuals with basic projects that will let me build, for example a push pull, Class AB 20 watt amp using all solid state with a preamp that allows for adjustment of the bass, mid and treble bands. I'd be happy with a passive three band Eq that simply rolls off the treble, mids and bass in their respective ranges...sort of a mixer, but for frequencies or a low, high and all pass kind of tone control circuit?
Collin's electronic vids are excellent! They're really interesting and I always end up learning something new. More like these please, Make!
I wanted the PWM "Circuit skills" because I love your videos !!!
Thanks Mr Collin
your videos are wonderful
I know nothing about circuits, but I still watch those videos!
this guy is amazing! !
redcinos Yeah! He is so ugly yet so cool! How that is possible?
i miss Collin please come back you're amazing
He's still around somewhere just look for him
Actually , i want to meet him, since im almost as crazy interested in electronics as Collin himself XD
we've been watching you with great interest, Mr anderson.
I feel like I've learned more from this video than any other circuit video. Keep em coming Collin :D
i put mine in a large plastic case I bought from Radio Shack (yes we still got one!). I cut out a square on the front that extends across the front of the top and covered the top with some protective mesh. This allows access to the PCB mounted binding posts and prevents hands from touching further back than the PCB mounted potentiometers. I finally added two digital voltmeters to the front sides. 👍
Always Interesting and NEVER BORING,,,Another Great Video From MAKE,,,Thanks Collin,,,,,,Best Regards from MR.OHM!!!
Great video, Thanks MakeMagazine and Mr. Cunningham.
Multi Multimeters, Mega Multi Multimeters
Again the only reason I'm still subscribed.
Fantastic job! Thanks again for these wonderful videos.
Informative as usual, keep it up! As always, i'm inspired to make something!
He didn't say he is usign those, he just wanted an example of a circuit that needs both positive and negative rails. You are right about the 'newer' rail-to-rail devices, they make life easier :) Another example would be high-end transistor audio amplifiers I guess, but they seem to favor much higher voltages, both positive and negative.
@3:10 Super graphic explanation of the transformation and rectification process.
Thank you!
this should be re-titled building shit on acid.
Great stuff Collin
Bravo!!! Excellent explanation!
Awesome video as usual. I just wish you would of put it in an enclosure at the end.. Still a great one, keep 'em comin. I always look forward to the circuit skills videos.
The only reason I'm subscribed to make magazine
You need to realise that he's aiming these tutorials at people who do not already have these kinds of skills. His cadence and facial expressions are so the viewer feels like they are learning along with him.
Every time he builds a circuit he has the most awesome geeky background music!
Yea! Collin! Good to see you again. Thanks for the vid.
I almost forgot why am I subscribed here, then I saw a new Collin video is up.
I didn't remember that "Circuit Skills" was Collin's show, so I didn't know what to expect when I clicked on the video, then I heard Collin's theme song and I thought, "YES! Collin's Lab, haven't seen one of those in a while!"
Finally! Another Collin video!
Cool, as always !
Collin for President!!! As usual good episode.
nice nice vids, nice editing, nice explaining, cheers
Dont forget that the switching frequency of your switching power supply can create noise on the power line which is detrimental to an analog synthesizer!
And my Ham Radio.
And my effects pedals
I love this guy!
Finally, a Collin video!
This guy is awesome!
Thank you very much, this helped me a lot.
About the linear vs. switchmode issue: you must always be aware of the ripple on the output of a switchmode psu!
the biggest advantage of transformer is that you can bash it in the head of the guy complaining about switchmode converters.
Collin! your videos are by far the best on this channel. Switching power supplies are indeed very interesting. However, given that the input and the output circuits are not isolated from eachother (not sure isolated is the right word), this change of frequence that it creates generates harmonics which increase the current in the power lines. I don't know how it is in the U.S. but in Argentina this reactive power is CHARGED if not corrected. Of course, if you use a lot of these power supplies :P
COllin collin collin! I missed you man! Make moar vids bro, you are my inspiration!
Thanks a lot! Now i know how to get a "negative voltage" - which I didn't know before this video. Thank you! :)
Nice work 😎
Pretty cool. It would look great in a clear acrylic case!
Excellent and funny too. Thanks!
how did u changed the output value ? was it a pot or regulator or something else ?
With great power comes... great current squared times resistance. I thought you were going there. Interesting video none the less.
@LightSwitchr The supply Colin assembled, is fixed to 115V input, so you would need a 230V primary, 12.6V 2-amp Split secondary (3-wire, 12.6-GND-12.6) transformer, and at that level of voltage, a enclosure,nevermind electrical tape over the primary wiring. Also a 230V primary transformer might not mount on the board as the 115V one does, though you could still run the wiring to the secondary points on the board.
I like your style
u also make awesome beats btw.
@StoreFood In a pinch, you can always use two wall warts and swap the wires of one to get the two different polarities needed by a ckt. You wouldn't want to do that if something bad would happen if only one voltage was present (one of the wall warts might get unplugged accidentally). If you are using two metal-cased supplies where the negative is attached to the case (meaning the supply is not "floating"), then you would have to make sure the cases never touch each other or ground, else sparks.
@ZboneWalker There are lots of videos on PCB making on RUclips. Some are for fairly complicated designs. For simple stuff, you can cut strips from electrical tape, stick them on the copper where you want the traces to be, and drop it in etching solution until the unwanted copper is eaten up. Do it all on paper first, marking where you will drill the holes for the parts, etc.
Finally a collin video!
@davidenelson It's because the capacitor store some more power upping it up to around 17 volts because voltage regulators need a little more power then they output.
Whoa I hadn't noticed that until now. I couldn't put my finger on who he sounded like until I saw your comment.
@BunnySk8rProductions Two designs: Charger feeds batt which feeds ckts (complicated) or when the batt dies, remove it and charge separately. Use a DC power supply ("wall wart") of a few volts more than the batt volt, thru a resistor, to charge the batt, then put it back in the ckt. The resistor is sized (in ohms) to limit the charging current to that which won't overheat the batt (it absorbs the diff between PS and batt volts. Start large and reduce ohms until max charging current is reached.
@CampKohler Thanks for the explanation
kipkay, collin, and tiny yellow house are the best of all!
Wall worts, killed me with that one Collin!
More circuit skills videos,please.
@LightSwitchr The number of turns of wire in the transformer primary is designed to limit the amount of current that flows in the primary (even without using the secondary winding). Putting a 120V unit across 240V will burn up the primary, because there won't be enough inductance to keep the current in check. Using a 240V on 120V won't burn up, but it may have weak output under full load. Just look for a kit manufacturer in your own country, so that it is compatible without worrying.
120 volts? Come on! Get some 240!
+StarTrek123456 fuck your shitty europe, europeice of shit
+StarTrek123456
Go easy on the americans, 120 volts is more than enough to make bacon!
+Gustav Ferdman mmmm bacon....
Edward Deaney
They don't even have their own money, fucking borrowers.
In Sweden we switched from left to right in 1969 and it's actually bin less accidents per year since then, and if you still think it's safer to drive on the left side then why does almost every country switch to the right side?
@CampKohler i know all of that stuff, but i mean the desingn of the board, i mean copper traces to be placed smartly so the board is as small as possible
@thewii552 The tip is likely bent to get into tight spaces. In this case, it allows the tip to be placed flat against the work (as opposed to just touching it with the tiny point). The more intimate contact allows better heat transfer (lower thermal resistance), so the joint heats to soldering temp. quicker. Quicker is better, because the glue that holds the traces to the board doesn't cook as long; ditto the components. That is better than using a big blob of solder to improve the heat flow.
And...Switching supplies are a lot more noisy in the RF domain which can sometimes be a real problem. Nice video. Thanks!
I realy don't tinker with electronics much except for rc planes and thats all plug and play components so no skill required. I like these videos a lot anyway I'm learning a lot.
@FrancekPirosrancek it depends on ic's, i think in the kit there's a lm7818 and a 7918 and they provide 1Amp with heatsink.
7:26 With great power comes great responsibility. 😲
@uut0 Many power supplies are built like you suggest, with a mains/line cord, especially for expensive portable use devices such as laptops, etc. However, it costs extra, and when the device is likely to stay plugged in and is being built to a price, they elect the cheaper two prongs.
The Bell System, recoginizing the "easiness" of which you speak, supplied 2-ft-long 3-conductor extension cords to allow no-cord wall warts to be plugged into tight places.
@WTF1wr1ownage je bent zo'n goeie rijmer!
i subscribed to makemagazin just for Collin's videos
@CampKohler or you could use a chisel tip. Or hold the iron sideways
@mewmaster151 I know that old picture-tube type TVs made a high pitched sound like that. The "flyback transformer" that controlled the beam, made an audible high whistle or whine that you just had to ignore. And the older electronic flash units for cameras did too... may still, for all I know. So it is more than likely the items are actually making a noise you can hear.
Great video and soundtrack. Is there a way to get some Collin's music?
Collin is awesome.
Great video as always, but the actual product isn't much so. I bought the kit from Jameco after watching this, just out of curiosity. Well... There is no input protection at all, no full bridge rectifier and the PCB itself has no silkscreen and no solder mask - just like the ones you get from Bare Bones PCB. Some caps appear to be of questionable brands and quality. If that would have been a hobbyist DIY LED Blinking project, it would be okay, but for a power supply - it's too expensive to use such cheap design and components and without any kind of protection this is just outrageously dangerous. Be very careful if you buy this kit.
@j7512 Plastic enclosures reduce the design precautions required to keep line voltage away from the user. However, metal is more rugged (doesn't crack when impacted or melt from component heat) and provides shielding, i.e. keeps signals in and noise out. Plastic is quicker and cheaper to build with. "You pays your money and you takes your choice."
@ZboneWalker Oh. What can I say? You lay out the parts on the board so that they fit nicely (don't physically interfere, heat from one part doesn't cook another, noisy ckts are separated from sensitive ones, air flow isn't blocked and so forth). Then you draw traces with a pencil (or two colors if it is double sided) until you have you connect everything with the least number of feed-throughs and the most direct runs. It's almost art. Beyond that, do you have any specific questions?
Hi Collin's could you make on of these series on OP-AMPs?
Can you use that for the color organ or is there any power supply included in the kit?
@mtj770 our 3 phase is 415v, I was talking about household electricity from a socket
Cool!
I liked Kip, for sure. Kip was fun and original. Becky and Bre, of course, too. Actually, they're all pretty awesome people. Make has always chose wisely. But Collin is very methodical. And I believe: if you gave the man a chimp, he could probably teach it to solder...and maybe jam on theremin too.
Collin is a hero.
@CampKohler Thanks for the useful information! ;)
@rockybyt it's okay because it has a built in resistor (on the board)
collin you should make videos more often, thumbs up if you think he should
Since this is posted last year you have probably already read this, but switching PSU's are in general more noisy, as in PWM instability have some procent less clean power, the best way to describe this is with a battery that give a constant volt-value when filled up. A linear supply give a very close constant volt-value, while switching supplies although more effective give the least constant volt-value of the three. That makes a switching supply bad for sensitive equipment, such as audio.
Do you think a relitive beginner could do this or is it just completely based on scamatics?
How to correctly use multi meter to test the component burn or broken on the circuit board ?
Classic Collin!
@Whisper6911 just regular caps, some have 2 wires on one side, others have one on each
Congrats on replying to my 7 month old comment, gold star to you! I was saying that power isn't volts. And its not.. its volts * current, like you, and everyone else on this video has mentioned. And, i too am an electrical engineer.. i just dont rub it in peoples faces.