I needed this to power avalanche transistor circuitry and high voltage “operational” amplifiers. They have an output range of +/-100V, so with some headroom +/-120V is a usable supply voltage. For auxiliary purposes, I have added a +/-15V 40mA in the same box. The internals look like this:
Click here for a higher resolution picture …
To the left, we have two coolers with temperature switches and BUZ325 pass transistors. In the middle (lower half of PCB), we have two power supply sections (see power supply pages for schematics) and the auxiliary 2x15V 40mA supply on top of the PCB. On the right, there are 4 analog panel meters and the output terminals. The 100VA toroid isolation transformer at the bottom provides 2x115V for the secondary sides.
The PCB looks like this:
This is a one-sided (mirrored) PCB. All PSU sections are floating and can be at any potential. Short circuit on the HV side is ca. 220mA, the temperature protection is set to 70°C. The BUZ325 is a rather old device with 12.5A/400V/125W max. Here we use ca. 0.22A/160V/35W maximum and there is temperature protection.
Full load ripple was a few mVpp, otherwise there were no special effects.
The schematics is shown below:
Electronic Projects for Fun 
Can you please post hi-res picture of the Schematic?
Thank You.
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