[0-30 Vdc Stabilized Power Supply]

Guys

You have been awesome supporting this project. I have built this PSU (see attached) but need some help!

I have a step-down transformer with 2x75VA secondary windings. If I connect them in series I get 34.0v AC and 52.0v rectified. This I think is too much for the OPA445s, in fact I know it is because 2 of them blew up after I connected it  ;D

As a test for the circuit, I disconnected one of the secondary windings and replaced my dead OPA445s with 60p TL081s. With P1 cranked up, I measured [email protected] across pins 3 and 4  8)

With the 2 windings connected, the reference voltage is ok - 5.6v appearing across D8 - and 11.v at pin 6 of U1. U2 is not happy though, he gets an input voltage at pin 3 proportional to P1's setting but nothing at pin 6.

What's my best bet? Upgrade R1? If so, what to?

Thanks fellas
spy

[0-30 Vdc Stabilized Power Supply]

Hi audioguru and others,

Very much looking forward to building this but want to be 100% sure of the approach from the start. I'm fairly new to electronics though so please excuse the stupid questions... in replacing D1-D4 diodes with a single bridge and Q1/Q2 with TIP31A,