0-30V 2mA 3A Adjustable DC Regulated Power Supply DIY Kit Assembly (In-depth Assembly)

[@ddistrbd1]

I watched this video 3 times already, then you inspired me to order the unit to practice on, you are not getting enough recognition for your editing and also your workmanship.

[@Ianistrip]

*for second power transistor in parallel for 5-6A bellow : 1)Transformer 24V AC & 6A of AC current, 2)You need to add another similar output transistor Q5 in parallel with Q4, so that the bases of both transistors should be joined together, the collectors of the two transistors should be joined together, and from emitters of each transistor to the output positive teminal should be add one resistor 0.22 Ohm / 3 or 5 W, in order to balance the power load of the two parallel connected output transistors Q4 and Q5. These transistors have to be mounted on larger aluminum heat sink. 3) Diodes (1N5408) from bridge rectifier should be replaced by higher current ones, or instead of using 4 diodes, an adequate higher current bridge rectifier can be used. 4)The resistor R7 (0,47 ohm - 5W) have to be replaced with 0.33 ohms - 12W resistor. 5)The resistor R18 (56k) that determines the maximum output current that then can be accurately limited to a lower value with potentiometer P2, should be replaced with 33k resistor. 6)For higher output current, it is necessary to put another electrolytic capacitor with a larger capacity in parallel to capacitor C1 (eg 4700μF / 50 V). It is best if you apply the rule that for every one ampere output current, it is necessary to predict at least 1000μF capacity for C1 capacitor.

[@fernsgilbert]

if you don't show its operation the purpose of the video is lost. Anyone coming here to see this video would definitely know how to assemble any PCB circuit... that too with a legend on it

[@grahamhall2662]

good build well 🙂

[@A_Kartik]

How to install voltmeter and ammeter?

[@pier-dante]

Hello everyone: This circuit is quite good but the power transformer should not exceed 20V. The DC voltage in the supply (+ Vdc, -Vdc) in the operational ones when setting the 24V voltage exceeds the maximum values for which the manufacturer designed it. The maximum data sheet voltage says + Vcc - (- Vcc) = 36V, recommended 30V. It may work well for a while and then the operational ones will burn.

[@TPOCWGF]

How should the 100k potentiometer be set, it was missing from my kit and so I had to buy it separately

[@Manche-De-Pelle]

I just received mine today but I'm confused with one resistor. There's one with 100k ohm but It's written something else (270k) on the place to put it like the blue part with the little screw is 100k. If so, the seller made a mistake

[@KuntalGhosh]

U need much bigger heatsink.. that transistor can give off 90+ watts at full dead short on the output. And that small heatsink will over heat fast & then the transistor also has no thermal protection so it will just fry and go dead short and kill your load and other parts. It will be better if u use a computer cpu heatsink & a thermal 70°c thermal cut off.

[@Electronics-n2w]

While testing st 10 ohm resistance 33 ohm resistance give smoke what is the reason

[@haroldandresleguizamonsand382]

Hola buen día compré un kid igual a este pero al probarlo no me da mas de 13 voltios que será lo que sucede?

[@michelluizvalente7024]

Good afternoon, I bought a 24 + 24 3A transformer and when connecting and measuring with a multimeter I saw that the output voltage is 25v, I would like to know if I can connect this board with this Trafo?

[@arklanbk]

yes u can

[@michaelbarton4787]

I do not recommend anyone considering buying one of these kits. Please do a search and you will discover big issues with it - note that I got 2 of these kits. Can't add any more as comment is being deleted ....

[@arpitawebsite6981]

hi Can i use a 24v 5amps Transformer with the above circuit. thanks

[@LahisTechLT]

As per its specs : Input voltage: 24V AC Input current: 3A maximum

[@tiloalo]

Yes, but it need to be AC, not DC!

[@franzotto448]

Hallo wo bleibt der Test, mich interessiert wie die Poti für Ampere und Volt sich drehen, ich habe für Volt ein Multirundenpotentiometer genommen, kann ich dir nur empfehlen. Beim ersten Test die Temperatur am R2 83 ohm prüfen, das scheind eine heikle Stelle in der Schaldung zu sein. Hello where is the test, I'm interested in how the potentiometer for amps and volts turn, I've taken a multi-turn potentiometer for Volt, I can only recommend. At the first test, check the temperature at the R2 83 ohms, which is a delicate place in the peat.

[@LahisTechLT]

Here is the Testing Video : kzbin.info/www/bejne/eZmXaaufbq11nJY

[@chipid4571]

Saya memilikinya, tapi amper sangat kecil

[@ddistrbd1]

Lahis, I just sent you an email about this power supply, hope to hear a response from you, I can only get one output of 14.6Vdc, no matter where I turn the potentiometers I still get no change in the output. please share your thoughts and comments if you could.

[@forcovers438]

sir if you give the schematic & circuit diagram along with the parts list then, maybe we could make one by ourself at home.... 😌😌please, we need this kinda' power supplies.....

[@slavarybkin7869]

1- Without LED You lost main idea of this project 2- Power items MUST be ventilated, so not touched the board - power diodes, resistors, etc. 3- Heat sinks must be connected to transistor BEFORE this transistor soldered.

[@LahisTechLT]

It is working without any issue. kzbin.info/www/bejne/eZmXaaufbq11nJY

[@959aleksander]

Очень гавённый блок питания

[@MrAnimeAmv1]

hey i have a Problem, i have the same board and used an led plug (24v) for the input but it doesnt work. when i measure the input voltage it was 31v (idk why) und the output voltage was -0,59v. is my board fried or does anyone have an idea what could be the problem? thanks

[@LahisTechLT]

The input voltage should be AC with a center-tapped transformer.

[@MrAnimeAmv1]

@@LahisTechLT thanks, i was usind ac, just not that kind of a transformer... the led was also glowing, what does that mean?