![Smith Kerona](/img/default-banner.jpg)
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Smith Kerona
США
Добавлен 13 ноя 2011
I present Electrical Engineering related videos.
DC Motor Speed Control Using 555 timer with fixed frequency PWM
DC Motor Speed Control Using 555 timer with fixed frequency PWM
Просмотров: 471
Видео
Testing Datasheet Static Transistor Parameters Using Power Supplies and Meters
Просмотров 1,4 тыс.3 года назад
Here I test a questionable transistor that I recently bought from eBay and compare the results to the datasheet specification.
Abysmal Auto-Ranging Functionality of Ideal Multimeter - Rant
Просмотров 4653 года назад
Frustrating Functionality of Ideal Multimeter on auto-range. Check specs of the meter here: pdf.lowes.com/howtoguides/783250614868_how.pdf
Two Wire Serial Protocol for 7-segment LED Display Using MM5451N (Can Control 5 7-Segement Displays)
Просмотров 6613 года назад
Two Wire Serial Protocol for 7-segment LED Display Using MM5451N (Can Control 5 7-Segement Displays). MM5451N can also be used as port expander for a controller with limited I/O to give you a total of 35 discrete outputs that you can use. Code to control this IC using the controller PIC16F887A will be published soon.
Update: Power Amplifier Design Video Series
Просмотров 1,9 тыс.4 года назад
Update: Power Amplifier Design Video Series
Power Electronics Project Demo - High Frequency Pure Sine Wave Inverter (24VDC to 120VAC)
Просмотров 1,3 тыс.5 лет назад
Power Electronics Project Demo - High Frequency Inverter.
25W Audio Power Amplifier Design - Part_2 (Class AB Output Design)
Просмотров 30 тыс.5 лет назад
Derivation of general expression for power dissipation across output transistors.
25W Audio Power Amplifier Demo - Full Tutorial Will be Available Shortly
Просмотров 1,4 тыс.5 лет назад
25W Audio Power Amplifier Demo - Full Tutorial Will be Available Shortly
High Voltage Linear Power Supply Design and Testing (0-200V)
Просмотров 9 тыс.6 лет назад
Here I show how I designed and tested a high voltage power supply in the rage of 0 to 200V
Open Loop DC Motor Speed Controller using PWM and H-Bridge (Demo)
Просмотров 5916 лет назад
DC Motor Driver using PWM
Single Balanced Mixer Design using Variable Gain Amplifier - Amplitude Modulation (AM)
Просмотров 3,5 тыс.6 лет назад
Application of VGA to Communications - AM Transmission
Design and Testing of Voltage Controlled Variable Gain Amplifier
Просмотров 14 тыс.6 лет назад
Design and Testing of Voltage Controlled Variable Gain Amplifier Using Differential Amplifier
Differential Amplifier Design and Testing - AoE Chapter 2 Question 5 Solution
Просмотров 2,3 тыс.6 лет назад
BJT Differential Amplifier Design and Testing - AoE Chapter 2 Question 5 Solution
Use of Positive Feedback in Amplifier Design - AoE Chapter 2 Question 4 - Part-1
Просмотров 8346 лет назад
Here I solve and demonstrate how positive feedback can be used in Amplifier Design.
Use of Positive Feedback in Amplifier Design - AoE Chapter 2 Question 4 - Part-2
Просмотров 4446 лет назад
Use of Positive Feedback in Amplifier Design - AoE Chapter 2 Question 4 - Part-2
Fake/Damaged Electronic Components from Ebay
Просмотров 1,3 тыс.6 лет назад
Fake/Damaged Electronic Components from Ebay
Common Emitter Amplifier Design - AoE Chapter 2 Problem 3
Просмотров 8 тыс.6 лет назад
Common Emitter Amplifier Design - AoE Chapter 2 Problem 3
Transistor Current Source and Its Non-ideal Properties - Part-2 - AoE Chapters 2 Problem 2 Solution
Просмотров 4526 лет назад
Transistor Current Source and Its Non-ideal Properties - Part-2 - AoE Chapters 2 Problem 2 Solution
Transistor Current Source and Its Non-ideal Properties - Part-1 - AoE Chapters 2 Problem 2 Solution
Просмотров 7676 лет назад
Transistor Current Source and Its Non-ideal Properties - Part-1 - AoE Chapters 2 Problem 2 Solution
Design of Transistor Switch - The Art of Electronics Chapter 2 Problem 1 Solution
Просмотров 2,4 тыс.6 лет назад
Design of Transistor Switch - The Art of Electronics Chapter 2 Problem 1 Solution
Lab Lecture: Understanding MOSFET Characteristics Using 2N7000 Transistor
Просмотров 2,8 тыс.6 лет назад
Lab Lecture: Understanding MOSFET Characteristics Using 2N7000 Transistor
LAB Lecture: BJT Differential Amplifier Analysis and Design
Просмотров 2 тыс.6 лет назад
LAB Lecture: BJT Differential Amplifier Analysis and Design
Lab Lecture of Design of Two stage Transistor Amplifier
Просмотров 13 тыс.6 лет назад
Lab Lecture of Design of Two stage Transistor Amplifier
Bootstrapped Class AB Op-amp Audio Power Amplifier Design
Просмотров 22 тыс.6 лет назад
Bootstrapped Class AB Op-amp Audio Power Amplifier Design
Follow up video to LM741 Audio Power Amplifier
Просмотров 12 тыс.6 лет назад
Follow up video to LM741 Audio Power Amplifier
Unusual LM741 or UA741 Op-amp Power Amplifier Using Darlington Output Transistors
Просмотров 18 тыс.6 лет назад
Unusual LM741 or UA741 Op-amp Power Amplifier Using Darlington Output Transistors
High Frequency Inverter Boost Stage 24VDC to 180VDC Design and Testing Using SG3525
Просмотров 2,2 тыс.7 лет назад
High Frequency Inverter Boost Stage 24VDC to 180VDC Design and Testing Using SG3525
I just started the video, so you will probably say it later, anyway... wouldn't it be better to actually have a capacitor on the voltage divider at the input on the second transistor (Q2) of the input diff. pair? I mean, the voltage divider works miracle for AC signal, but for DC ones you'll have a diff. pair which is not balanced, and as far as I know, that can't be good as far as common-motion rejection goes, right?
Hi..Thanks for the detailed video.How can pick an inductance value of speaker for simulation. Is it by sweeping speaker on an impedance analyser and find the inductance of the speaker for the frequency of operation? @25.00 is there any reason why which you didn't plot the power dissipation curve instead of differential of power dissipation
Using the +ve input of the MC34072 as feedback (made -ve by the mosfet) is begging for oscillation. I see the 150pf in the feedback, I hope it is enough, BUT it is part of a 150pf/1,000pf divider at higher freq.
12:45 Why is so hard to have a no-damaged speaker, this days? 🤣
Sir, i tried ur schematic on multism, the output is smaller than the input. May u give me some advice? what i did wrong?
An inverting loop made so by the mosfet inverting to positive input, your are BEGGING for oscillation, no matter the mosfet C!!!!!!!! ....SERIOSULY!!!!!!!!!!!!!!
Wow, the 100k will be dissipating 6.4Watts when the voltage is set to 0V output!
That is incorrect! The DC bus that the 100k resistor is connected to can at best go to 200V. At that voltage, if the output is set to 0V, the 100k resistor will only dissipate 0.4 watts. And that is the worst case scenario. Now if you have watched the whole video I do mention that when I build the 800V supply, all the components need to be selected appropriately.
But for the purpose of this video and this particular circuit, the 100K resistor is more than adequate.
@@SmithKerona Ooops, my maths is a little off :) ...I get into such things because I have a pet peeve about wasted power, so my emotions got the better of me! Btw, I design electronics stuff , sometimes power supply, and it is almost always hybrid tracking, because I like clean power, but hate power waste. :)
@@SmithKerona Yep! :)
No over temp (high risk in this), no over current or short circuit protection. You might find what useful what a RUclips channel "FesZ Electronics" did. :)
Omg you are a madman
Well, it is now 3 years later... sadly there is no more video about your work on the amp. So i save my time and do not have a look at the 2nd part.
I made a similar circuit, used Fallstad simulator, i adjusted the circuit to deliver 1 amp @ 1around 9 V.p.p. swing from a 2 x 15 V transformer, so 2 x 19.6 V. Using BD137, BD140, it follows the input voltage perfectly, pcb made, on it's way. wonder how it sounds, also included 2 pole Sallen Key filter. How much watts would that be would your recon? P = U x I, states like 19 ,6 watts, right or wrong?
Hi there, I hope you are doing well, its good to hear that you made the circuit, I want to ask you about how did you find out what type of capacitors he was using, like ceramic, tantalum or electrolytic. Plus are you talking about the power calculations across the capacitors or at the speaker itself, You could easily calculate that by using a simulator, or by the equations that he had described in the video, if you know the parameters
@@Gagandeepsingh-uf2un The pcb's are on the way.
@@AnalogDude_ but that does not answer my question
@@Gagandeepsingh-uf2un I use big 4700 electrolytic, 5 of them, 23500 uF in total and some film/ceramic. for just one speaker. Is that what you're looking for?
@@AnalogDude_ yes, thank you for the response. Means a lot
thank you very much
Magnifico, grandioso !! ⭐⭐⭐⭐⭐
This is excellent! Where is the rest of the videos?
Op amp drive huh🙃
just found this, its v good. any follow up?
Very well executed and thoroughly tested with great effort, I am very impressed! I am just wondering why the op-amps are functioning correctly, as they are controlled by two potentials: 15V from the power supply and at the sensor input from the output potential 0-150V. I did not know that this was possible at all. Or is it a special function of this type of op-amp? I assume that both potentials are referenced to ground, is that correct?
Hi.a question what is difference between video and audio amplifier pls answer me if you know
Video amplifier typically is a wideband amplifier which means it is able to amplify signals with frequencies from few hertzs to hundreds of megahertzs. While an audio amplifier is meant to amplify signals from few hertzs to hundreds of kilohertzs.
For example NE592 is a typical video amplifier while LM386 is an audio amplifier. Take a look at their datasheets to learn the difference between video amplifier and audio amplifier.
I wanna have your bench 😢 goddamn with your set up. At my pace , it would take me prob 10years to have those goodies. Thank you for the vid, I will copy it and test a few things. I can't believe I understand everything, I'm amazed at myself.
Very nice. Thanks.
I have a question when it comes to the inductance value of the load. What if you're designing a general purpose audio amplifier rather than pairing it to a specific driver of known parameters? Y'know, what a lot of car audio amplifiers are, what a lot of unpowered bookshelf speaker amplifiers are, what a lot of the DIY enclosures use, etc. Is there a good inductance value to use for this? Do you just pick a generalized range for inductance, such as if I'm looking at an amp for car audio subwoofers where the driver Le (the notation for inductance in T/S parameters) is commonly around 6.5mH at the high end with a handful of outliers being within the 8.5+mH range, just from glancing at some databases, would it be fair to just use Zl=Rl*1e-2 and just have the extra overhead for versatility? In the example of anything but car audio subwoofers, I know drivers are typically <<1mH, again from glancing at the same database, so would a general purpose amp just use Zl=Rl*1e-3 for the typical upper end with ample overhead?
Great job!
Out of my own curiosity, regarding Ideal #61-484, when you are in diode mode, and there is a short, does it make a beep noise like Fluke 87V? I am talking about when it is in diode mode. NOT in Continuity Mode with noise. Thanks.
Your dome is pushed-in. Not serious about the business.
Yes, and the schematic paper was precariously clipped to the clipboard 📋. So, another minus of 150 points.
Are you ever going to finish the 25W audio amp design? I has been 4 years since this was started and 3 years since you said you would restart/complete this series. Really appreciate this series but just looks like we'll never see it completed... 😒
which sensor you have used for feedback ?
nice!!!!
EXCELENTE VIDEO
I wish electronics was taught like this in college. Info is easier to absorb because of an objective which is to design.
no part 3? 😢
It's beautiful
Man this is unbelievable, thanks for the video
Hİ, which are you using books ?
Cool idea! Did you try it with only local feedback for the op amp?
1:40 This circuit has quite a few design flaws. The input stage has a very low bias current of abt. 1.7mA, leading to low transconductance and current starving of the voltage amplifier stage at frequencies above 1kHz, which in turn causes poor slew rate and distortion (mostly 2nd harmonic). It's also hugely disbalanced, because one transistor draws abt. 0.46mA (0.7V/1.5k), while the other one draws 1.7-0.46 = 1.24mA. The whole point of a differential pair is to be perfectly balanced. Deviations in transistor currents over 1% cause a significant increase in distortion (2nd and 3rd harmonic). The best solution here would be to use a current mirror - the increase in complexity and cost is negligible compared to the great improvement it makes. It's also beneficial to increase the bias current to abt. 6mA and add emitter degeneration resistors of abt. 33 Ohm to the differential pair. The dominant pole capacitor (220p) is too big. The whole point of the dominant pole compensation is to bring the open-loop gain down to unity just before the phase shift at the output approaches 180 degrees, thus turning an amplifier into an oscillator. The value of Cdom is determined by the current sourcing/sinking capabilities of the transconductance stage and the VAS collector impedance. The open-loop gain here is not that high to begin with, due to the aforementioned low transconductance and current starving of VAS. All of this leads to a poor slew rate and great increase in distortion at higher frequencies. The VAS collector is loaded by a current sink, which is correct, but there is never a need to adjust the exact current flowing through it, so the 10k potentiometer is useless. The 2.24k pot is placed between the Vbe multiplier's base and collector, which is a timebomb, because if it fails, the bias voltage will increase to a maximum, likely causing the output transistors to blow up. It's always a better idea to put it between the base and the emitter. The 3K resistor between the driver transistors' emitters is too big. Reduce it by a factor of ten and put a 0.1-1uF capacitor in parallel. Its purpose is to provide a small reverse-bias voltage to the output transistors, making them turn off faster. Doesn't hugely matter in this relatively low-power circuit. It's always a good idea to couple the lower leg resistor of the feedback circuit (10K) to ground through a large (470uF+) capacitor, thus bringing the DC gain down to unity. The input pair is never going to be perfectly matched, and you don't need to amplify the DC offset voltage. The 220K will then have to be reduced to the same value as the input bias resistor (10K in this case) to match the impedances. It's always better to keep the value of these resistors as low as practically possible to reduce the Johnson noise (the exact values will ultimately depend of the signal source's output impedance). It's also necessary to put a small (4.7-33pF) capacitor in parallel with the upper leg resistor of the feedback circuit. This circuit is likely to work fine without it because its dominant pole frequency and slew rate are very low and therefore the Nyquist stability is not compromised - but the noise and distortion figures most definitely are. That's all. :)
@@waynecummings5021 It's all complete gibberish, I assure you.😊 A really good book to read would be "Audio Power Amplifier Design Handbook" by Douglas Self. You can download it for free. It does require some knowledge of electronics though. Power amps are relatively simple circuits. About 95% of all amps use the same basic topology shown here, it's only the details that differ (but they do make a big difference). The best way to get started is by learning about positive and negative feedback, and how a differential amplifier works. I can't recommend any videos because back when I was learning this stuff, there weren't any, and now I rarely watch them. You could watch some about operational amplifiers, because that's what power amps basically are: big, discrete op-amps. What kind of "glitch"? Analog circuits rarely glitch in the same way computers and other digital devices do. Normally, if they stop working properly, it's due to a component failure. If your amp hasn't blown up, if there's voltage on the supply rails, and the output transistors are not shorted (which you can easily check with a multimeter when the power is OFF), then you could probably fix it.
@@waynecummings5021 As someone who likes posting huge Walls of Text™, I really don't mind a long answer. :) I've taken a look at the STR-DE585 service manual. Lots of stuff there. If all the channels have the same kind of malfunction simultaneously, then the problem is clearly not with the output amplifiers themselves. It's most likely in the digital circuitry before it. The first problem might indeed be caused by false triggering of the thermal protection circuitry. Or by a leaky diode or transistor that starts drawing too much current as it heats up. The second problem can be caused by lots of things. It can be just a loose contact due to a mechanical failure (cracked solder, SMD resistor or capacitor), or an actual digital glitch - anything. But it's definitely in the input circuitry, not in the output amp. It's very hard to diagnose anything remotely. The process of finding a malfunction is not that hard per se, but it's very tedious. The standard procedure is to connect a signal generator to the input and follow the signal path throughout the entire circuitry until a point where it breaks. Then compare all the logic levels and DC voltages to those given in the service manual to find out what's responsible for that. Oscilloscope is required. The third one sounds like an actual amp problem. If it's a relay that clicks at a 5 sec interval, then it's definitely the speaker protection. You need to measure the DC voltage at the output, it should normally be close (within 100mV) to zero. It could also be the over-current protection. Both these problems are normally caused by an output transistor failure (one of them must be either shorted or non-conducting at all), but not always.
@@noneofyerbeeswax8194 Thanks for the heads up bud! I will check the systems as I go and learn as I do it - which is the whole point anyway, so I had to jump in the electronics pool at some point. I don't mind looking for the issue as it's both interesting and practical. You mention a service manual? I have already asked Sony for information like a schematic and they are telling me they only give them out to Sony engineers and such. They also called my 585s 'senior'!!!, in that they've had a good life, just left them pass away with dignity. The cheek of it! I explained to them that I bet they have a 'Let's save the Planet' mantra and yet here they are telling me to trash 99% of a great machine because it has a broken spring. I also told them they better not say that to their Directors as I bet a lot of them are 'senior', but I bet they don't want to be trashed. I am actually looking forward to diagnosing the exact issue/s if I can. It's a very transferable skill in this world. The oscilloscope sounds like a must I have realised. I am at that stage where I am slowly purchasing things like needle nose pliers, MESR-100 Capacitor meter, Atlas DCA55 component analyser, and researching other diagnosis aids. I have a cheap multimeter (MM) that for the first time last night I ran around the amp while it was powered up. I was nervous, but I saw a guy use a MM with negative on earth and live touching various parts remembering that current finds the shortest path, hence it gives readings without going pop. I really want to know how to find exact component failures. I want to know the exact culprit in a den of culprits. I love finding the specific failure if I can, but I appreciate that isn't always the case.
@@waynecummings5021 I found the service manual just by goolaging it. 52 pages, schematics, PCB layout etc.. Can't put a l!nk here because YT will nuke my comment. Yeah, let's save the planet by throwing a piece of equipment away. Somebody will pick it up, and it will probably end up in China one day where they'll desolder it and sell the used components on Aliexpress. Someone will then buy them and make another amplifier, and thus the circle of life will be completed. Oh, yeah, and they will have thrown all the parts they don't need into the sea cuz why not. The senior directors joke was hilarious. Very true!🤣 Performing measurements with power on is perfectly normal. A cheap MM goes a long way. They are usually rated to 1000V DC/ 750 AC, so you can measure the mains voltage directly if you want to. Just be careful and choose the right setting. Voltmeters have a very high input resistance and can be connected to a voltage source without any consequences, but you don't want to accidentally set it to amperemeter and put the probes into an outlet - this will cause quite a lightshow!💣 A caveat regarding oscilloscopes: their chassis is always grounded - meaning, it's connected to real earth via the mains outlet, and thus to the mains neutral wire. Therefore, you cannot connect an osc probe's ground to any device powered directly by mains voltage because it will create a short circuit. A power amp's supply rails are isolated from the mains by its power transformer, but its chassis is normally grounded too, so if you connect the osc ground to any other spot than the amp ground, it will create a short circuit too. There are several ways to solve this. I've done it by simply disconnecting the ground wire in my oscilloscope, but it's definitely not an officially recommended and authorized procedure! (It bears no safety hazards whatsoever, quite the contrary, but there are other reasons why it's not recommended.)
@@waynecummings5021 Regarding the books, I've somehow forgotten about The "Bible": "The Art of Electronics" by Horowitz&Hill. Great stuff!
MAn i have been lookin at this .Symbolic amplifier design..There is only one book i have not been abel to get >and they use mathematica ..You solved all my needs
Outdated croc of shitt😮
Sir please explain the circuit , make a detail video on this circuit
High order harming is way too high, their bad can be described as n^2/n, not good performance on such design.
Great video thank you 👍👍🇩🇿🇩🇿
Very creative use of power rails, lol. I’m surprised it even works as well as it did - there must be all sorts of non-linearities between the signal and power line circuits in an op amp. Kudos for creativity.
Alvrg soy mexican. En estados unidos están a otro nivel. CHido el amplificador.
Nice video, thanks :)
There's no capacitor in Q2 after 10k resistance, so how to ground ?????
Hi, greate video and explanation!. Any progress with the video and schematic for the 800VDC regulated power supply?
All those scopes and analyzers and the one your probes are hooked to is a Rigol. 😢
Seu laboratório é incrível.
I guess you must have been on the recieving end of a company recycle, they often get rid of perfectly good equipment to justify getting the latest gear. Am I jealous? well-er-yes.
Good music..good courses