RED 0-30V 2mA-3A power supply kit SOLUTION 

@robertalabla Hi Razzle Dazzle.. Yes, the LT081 was faulty so with a quick swap out for genuine it works as it should.

PS. I swapped all three LT081's for genuine to give the best chance of long term success.

@@Elecifun Nice. Glad to hear it.

Yes nice results compadres! 🤔

@faristabakovic147 stopped working? no power anything? have you tried replacing the LT081's with genuine?

@@Elecifun I measured the voltage on the board and it is 30v, but there is no voltage at the output from the board.

​@@faristabakovic147 Swap out the op-amps and double check the big shunt resistor is OK, and the power transistor. Should fix it. Pretty much all the supplied op amps are fakes. Or use UA741's instead. Both are fine. Always use sockets on the op amps. Saves a lot of hassle.

Also check your -5V supply. R2 (82ohm) gets very hot and can fail. If it does, the board won't work. Replace it with a 1/2 watt or two 160ohm 1/4 w in parallel. You actually should replace it anyway.

@@uni-byte Very true, thanks.

@johnproudlock2900 I bought 9 for 3 boards at 40p each. the SN is 304-223 I hope everyone that watches and has had an issue can get theirs up and running. TL081CP 4MHz DIP8

@@Elecifun Thanks for that. I decided to use my geniuine hiland board TL081CP i switched out the 3 as their in dip sockets and it went from 26.97v to 30.64v. I know its not a big change but its working as descibed now. A bit thanks to you and demnoss.

@decem_unosquattro9538 up to a max of 3 Amps with a 3 amp transformer. The pass transistors in the kit can only dissipate a 25C 90 watts.

@@Elecifun oh wow that's interesting! 🤔 So basically your saying this can put out its rated voltage and current. That's a very interesting a good result compadre. 👍🏻

@decem_unosquattro9538 In an ideal setup, yes. In reality not quite. Much of getting the maximum will depend on components used. Remembering the main output (pass) transistor can only dissipate 90 watts at 25C. The transistor will get hotter than 25C and then it de-rates not giving the max output. The load regulation on the transformer can effect the max output. As the load increases the transformer can drop in output voltage which in turn means the voltage going in is not 24vac, again this effects the output max wattage.

@@Elecifun OK. Thats most interesting.🤔 I guess that's why that dude attached a massive heat sink to the big transistor. To dispute the intense heat that's generated. 🔥

@@Elecifun So in hindsight how many watts is this regulated power supply actually capable of? I mean sustain wattage?