#713

Рет қаралды 13,541

3 жыл бұрын

Episode 713
Back to basics: Power Supply
Voltage regulation and pass transistor, heat sink considerations
Product:
www.banggood.com/EQKIT-Consta...
Manual:
www.icstation.com/product_docu...
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Пікірлер: 27

@Savan_Triveda 3 ай бұрын

This is by far the best electronics teaching I found so far on youtube.

@HelmutTschemernjak 3 жыл бұрын

The power supply course is exactly what many of us needs to learn. Thank you so much for educating us.

@IMSAIGuy 3 жыл бұрын

good to hear

@ef7408 3 жыл бұрын

I like when you explain the use of relays on linear PSU to optimize efficiency and reduce the heat sink size ! Very clearful. Great !

@Cabalist3131 3 жыл бұрын

These are so lucid. Thanks for this. A lot of things are all getting pulled together in my mind

@IMSAIGuy 3 жыл бұрын

Glad you like them!

@MrAlFuture 3 жыл бұрын

This is a wonderful series of videos. Thank you!

@IMSAIGuy 3 жыл бұрын

Glad you like them!

@absurdengineering Жыл бұрын

Hint for “young players”: toss a 2nd pass element configured as a follower between the rectifier and the storage capacitor. Since AC isn’t on all the time, you get up to 35% power dissipation reduction for almost no effort, and the “final”’regulator stage can operate with very low dropout voltage.

@wagsman9999 10 ай бұрын

Brilliant! Thanks.

@Enigma758 3 жыл бұрын

If your power supply has a selector switch which selects a relay which then selects a coil tap, why can't the switch itself select the coil tap?

@IMSAIGuy 3 жыл бұрын

there is a manual switch in many supplies. Usually two ranges.

@rudrakshavegad1999 3 жыл бұрын

Great explanation sir . Iam also building a power supply ( 30V ,1 A ) I have a transformer with 0 ,15 and 30 V taps .now the problem is when I change the taps with relay, say 15 V tap to 30 V tap the the filter cap (3500uf) creates sparks at relay . I have searched a lot about snubber for this configuration but nothing works . Can you please help ? With a video or a schematic to learn this tap changing technique.

@IMSAIGuy 3 жыл бұрын

Here is a schematic of a supply with relay switching. elektrotanya.com/mastech_hy-1803d_single-output-dc-power-supply_sch.pdf/download.html you could try a surge protector: www.mouser.com/ProductDetail/Littelfuse/ST1R020B/?qs=gGwQ3tp6HcQeByB84iAXFw%3D%3D or resistor. I would guess a spark is normal and the relay must be good enough to handle this.

@IMSAIGuy 3 жыл бұрын

I looked at my HP E3631A supply and it uses triacs bta06-600b

@jenntek.101 2 жыл бұрын

could you use a fairly large Heat sink and Thermo-electric Cooler plate at 12v 100watts? or something similar? In place of a noisy fan?

@IMSAIGuy 2 жыл бұрын

sure, many of the old HP power supplies had a very large cast aluminum heat sink

@IMSAIGuy 2 жыл бұрын

like this one: kzfaq.info/get/bejne/aZZggbag3rGog2g.html

@unwonek Жыл бұрын

What is the role of C4?

@IMSAIGuy Жыл бұрын

low pass, smoothing

@andel0792 9 ай бұрын

+V has to be greater than 30V if we want the output to reach 30V. Where do you get that +V from?

@IMSAIGuy 9 ай бұрын

it is generated by a bridge rectifier from a transformer, didn't you watch part 1?

@andel0792 9 ай бұрын

@@IMSAIGuy Yes, I watched it. Great video by the way! On part 2 you say that the OPAMPs are supplied at -5V/+30V. This means that the output of this circuit will always be smaller than 30V. Even if the OPAMPs are rail to rail you are losing at least 1 volt from the Darlington pair. Am I missing something?

@IMSAIGuy 9 ай бұрын

@@andel0792 sure, if you needed 30V then the supply will need to be a volt or two more

@andel0792 9 ай бұрын

@@IMSAIGuy And why do we need the -5V?

@IMSAIGuy 9 ай бұрын

@@andel0792 so it can operate at zero volts well