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Cheap, variable, dual rail supply for amp testing?
Cheap, variable, dual rail supply for amp testing?
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Old 13th September 2019, 08:07 PM   #11
Rallyfinnen is offline Rallyfinnen  Sweden
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Thank you for the tip!
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Old 13th September 2019, 09:22 PM   #12
sasha70 is offline sasha70  United Kingdom
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Hi, I have seen a few good review about this DC to DC converter.
DPS5015 DC 50V 15A Regulated Parts Digital LCD Display Power Module Step Down | eBay
Best regards.
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Old 16th September 2019, 06:27 PM   #13
Andersonix is offline Andersonix  Sweden
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Cheap, variable, dual rail supply for amp testing?
Originally Posted by Rallyfinnen View Post
Variac would be nice, but kind of fall out of the cheap-category..
Keep your eye out for a used variac, as itís exactly what you need.
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Old 26th September 2019, 07:25 AM   #14
Rallyfinnen is offline Rallyfinnen  Sweden
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Originally Posted by ubergeeknz View Post
I hope they work out but they do look like they're designed for eg. Battery charging where there's a steady draw, and may not limit current instantly, in the way you would like. I'd test one into a dead short or a small value load resistor with a low current set and see what it actually does before trying to use it. My 2c.
I received the boards and tested this with a 5ohm resistor, and it seems fine. Delay varies depending on the set current limit vs actual current, 10-30ms delay with the settings I tested. I think a fuse would not do better.

Ripple seems ok too. Maybe something I could use instead of a massive capacitor bank on a class a amp..

Last edited by Rallyfinnen; 26th September 2019 at 07:36 AM.
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Old 27th September 2019, 10:49 AM   #15
zjjwwa is offline zjjwwa  Poland
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Cheap, variable, dual rail supply for amp testing?
How about something linear, with traditional transformer?
A voltage source / current source?
Any good designs with precision voltage setting between 2V - 60V
and with the possibility of fallback into current limiting mode, 0 - 5 A,
but with this current limiting mode also with precision setting capability,
so that it could also be used as a "current source"?
... In view of the fairly cheap readily abundant readily available Chinese universal laboratory voltage power supplies, does it make any sense to considering building one by oneself?
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Old 28th September 2019, 01:33 PM   #16
jackinnj is offline jackinnj  United States
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Cheap, variable, dual rail supply for amp testing?
Most of the Antec transformers have dual primary and dual secondary windings. Two such transformers can provide a multiplicity of configurations satisfying most power amplifier supply rails by putting the primary in parallel or series.

For power amplifiers, regulated supply isn't necessarily good for testing output stages -- the regulator can put its own signature on the supply rails.

Me, I have a big Variac bought from a fella who used it to power up his air conditioner when Jersey Central Power and Light had one of its frequent brown-outs.
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