วีดีโอ

hoping this is going to be the best series ever

Very nice video, well explained. Very instructive for me. I love this project that I'm building alongside your explanation. Thank you so much for sharing this!

great videos, but it would be easier on my ears if there wasn't lip smacking between sentences.

I’m a big fan of the Darlington pairs. A less obvious advantage of sharing the same case is thermal stability.

What you explain so well is all contained within the OpAmp, and is just one of the things an OpAmp does so well. What is not part of 99.9% of all OpAmps is a high current output stage. I recommend designers use OpAmps to drive a discrete current stage such as you are using because of the OpAmp’s convenient dual inputs and extremely low distortion. There is literally NO downside. The complete amplifier can operate on a single end supply or dual supply if available. The dual supply allows a DC-coupled amplifier if needed.

WOW very impressive 😍😍

I had the same idea, but never built it. I was trying to figure out how to bias and stabilize the amplifier transistor, but I never even drew it. There is no worse management than that which is not done. Thanks for that video. I'll try it.

Verbal diarrhea aside, i was wondering how youd separate the embedded (redundant) controller. I plan to have everything running on custom firmware but as we know any sbc or controller i use run on low voltage. I was going to galvanically isolate the variac from the nema by using a custom coupling mechanism thats non conductive and any fail state fails safely. Im 45, a nerd and retired haha. Plus i dont want any smps noise on my bench. All my power supplies are linear for dc. I was thinking id build an emi shielded box for the power supply and controller for the setup. Kinda like when i build guitars haha. I reqlly do not want to use bulbs to indicate shorts.

Cool video. Im into embedded design as a hobby and im working on a touch screen interface and plugs where i integrate a variac, 1kva isolation transformer, touch screen, power resistors and plugs which will have a digital indicator of what they are and what's safe and such. Its part of a workbench renovation and i have a bunch of parts, motors, embedded controllers. I want all the heavy stuff off my bench and there only be a touch screen with controls, clear state indication of the plugs, variac status, isolation transformer and short detection for the dut. I was going to put the isolation in a wooden box along wirh the variac but separate them with wood or acrylic. This will be a permanent installation. I was going to use a canbus setup along with high end relays to put things in and out of the chain. The variac was going to be controlled by a nema23 via the touch screen interface wirh granular or linear control for the desired output voltages. The plugs will open with servos and such so nothing can be used unsafely. Plus i want it to look cool af haha i was going to print a mechanical panel which covers the plugs and barrels using a statemachine i code.

Sparkos op amps are discrete class a as an operational amp

Clear and helpful. From start to the end. ❤

Did you thermally couple them?

Does anyone know what happened to this channel? I tried to contact the creator via EMail, but he did not answer 😞 It bothers me that it has so less followers and views. Because it is really, really good quality! So, if anyone knows more about it please answer here.

Also, how do you determine which lead goes where for the electrolytic capacitors? How do you decide whether to use a polarized electrolytic or non-polarized ceramic?

The two 10k resistors in parallel with the base of the transistor would have an impedance of (10k + 10k) // Transistor_Base, correct?

How do you select the resistor at the base for the diode configuration? You said something about needing the current through the resistor and series of diodes to be greater than the current at the base. Why is that, and how would I go about figuring it out?

Thanks for sharing. I did not find the leafLoad project, in your videos. Please provide a link.

@8.43, no need to subtract Vbe1.

@12:34 isnt two 100nF caps in series 50nF ?? the screen says 10nF ??

I don’t know why you get so little views/likes. This is good stuff.

Cool stuff… I’m trying to make amp for a 1W 8ohm speaker driven by microcontroller output of 3v p-p and about <5mA. I got it going with a 12V rail and burning about 1A. But gets nice and hot (using heat sink ). On the scope getting some distortion so something still not right. Hopefully I find my mistakes from this series. In a nutshell it’s the impedance that messes me up.

Love it.

Why is the Vin of the Voltage divider Vc? Rc is clearly connected to V+. What did i get wrong?

You flipped the inputs of the inverting opamp 🙂

Hi, thanks for this videoseries. I've learned a lot over the previous parts. What i don't get here, is why you are adding Ve and VceSat to get Vc? Thanks in advance and greetings from Germany 🙂

i'm still confused on how you got 13.99,is it not 14.28 if you multiply 12v 0.119?

That bandaid...,

Can you tell from your experience what current do need Apple iPod headphones, to be loud enough?

This particular video has been very useful for me, as I've never heard about the Sziklai pair, I always used the darlington pair or a MOSFET.

Great job..

I would recommend to avoid the simmetrical clipping technique. lets just the wave get a ansymetrical clipping. That will make sure that the harmonic content with the distortion have more even harmonics.

Duting the fisrt few seconds I've notice you are in Portugal. Um grande abraço de um colega de profissão.

vc é Tuga?

If I use a 24V power supply, It will work? Is there simple spots to change or it has to be all recalculated again? Thanks

Thanks, I used your Voltage gain circuit, but I used a mosfet current gain instead of BJTs and a linear PS. Is hot, is inefficient AF but sound great.

these videos have been really useful, i hope you're not done with youtube

Nice info, thanks

Dear i want to build similer circuit but in the end of video you said its THD Is 0.065 for mobile hand frees now i am confused that should i build it or not and what will be the sound quality on hand free

Good work!

vacuum tube Yess!!

You explain everything very well, thanks!

Great content, very well explained!

what will be the current sink resistors? A few omh? A few hundred oms? Or even Kilo ohms? I want to get rid of my huge chungus resistor on my class A amp and thats why, on reddit everybody recommended that technique :D

Dude, this is absolutely priceless playlist , thanks a lot. Please explain jlh 1969 design in one of your videos, really can't wrap my brain around it. Pls ,pretty pls

Thank you very much

Bon Dia! Your videos are so good, stick with it until the algorithm catches up. Cheers from the USA.

Great video! Thanks

nice video! this should get a larger audience.

Thank you for teaching 🙏

Please provide subtitles in Portuguese, please!