Does anyone know of an off the shelf regulator that will give me 60-65vdc. The psu for my westrex high frequency limiter died. Looks like it's the transformer. I have some dual secondary 30v torroids. The westrex are supposed to use 65v but I figure a little less won't be terrible. I wouldn't mind buing a 65v supply(i know it's sacrilidge) but I can't find one. Any suggestions?
65vdc regulator
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BYacey
Well-known member
Use a 7824 regulator, and put a 41 volt zener between the ground pin of the regulator and power supply ground; cathode towards the regulator. This will float the 7824 and regulate at 65V.
> I wouldn't mind buying a 65v supply(i know it's sacrilege)
Since we know you are running a business on that thing, customers lined-up in the streets, we forgive you for taking care of business before DIY.
> but I can't find one.
You can find "+/-15VDC" supplies everywhere. A commodity supply, frame or wall-wart, will have floating outputs, ground separate from "0V". The "0V" does not have to be at system ground, just within a hundred volts or so.
Get two and wire like this:
I have not shown any Ground or Common connection on the 60V. If you are replacing an existing power supply, that is probably handled in the wiring harness, so just get your plus and minus the same as before.
For 66V, use a "+/-15V" and a "+/-18V" in series.
Since we know you are running a business on that thing, customers lined-up in the streets, we forgive you for taking care of business before DIY.
> but I can't find one.
You can find "+/-15VDC" supplies everywhere. A commodity supply, frame or wall-wart, will have floating outputs, ground separate from "0V". The "0V" does not have to be at system ground, just within a hundred volts or so.
Get two and wire like this:
I have not shown any Ground or Common connection on the 60V. If you are replacing an existing power supply, that is probably handled in the wiring harness, so just get your plus and minus the same as before.
For 66V, use a "+/-15V" and a "+/-18V" in series.
BYacey
Well-known member
The only thing I would add to PRR's scheme is to ensure that the power supplies 0V terminals do not have any reference to chassis or AC supply ground. These have to be electrically isolated.
