03-02-2018, 11:14 AM
(This post was last modified: 03-02-2018, 11:16 AM by Old Sparky.)
Fair comment, Nick, but the (presumed) 50vDC in this PSU should be present when mains is applied, so that the associated power amplifier PCB, which also contains the switcing line, is powered. From there, via a momentary switch, the PSU is controlled, and outputs +7 & -7v to the (as far as I can tell) the preamplifier, which is on the same PCB as the power amp. (That's how I understand the circuit anyway) I don't have any bench PSU which goes above 24v, but can use that as a substitute for the main DC supply, but will have to make up or buy a dual rail 7v supply to replace the other one. This will prove if the amplifier works, at least! BTW, I have a long running thread over on UKVRRRDF about this problem, and included in it is a link to a similar ATX PSU.
