[sdiy] Load testing dual PSU

Rob Spencer Rob at gmsn.co.uk
Mon Nov 3 16:07:55 CET 2014

Hi Roman,

Thanks for the confirmation. In fairness I probably just need to get some higher power resistors. For some reason I had it in my head that they would be hugely expensive. I think I was picturing massive heavy ones that I remember from college. I'm sure they aren't as expensive as I thought.

P.S. Friend request sent. I'd like to see the photos of that's okay.



> On 3 Nov 2014, at 12:49, Roman Sowa <modular at go2.pl> wrote:
> hi,
> actually I use both :)
> A string of 1 ohm 20W resistors, about 15 of them, so I can adjust load
> resistance with banana cable by clamping part of the string. And there
> is also G4 socket with soldered across part of the ladder, so I can see
> if there's heavy current flowing or not witout looking at power supply
> Amp meter. This is usable when testing switching circuits. I plug there
> 5W, 10W or 20W bulb depending on needed load capacity.
> It get's hot, no matter what you do, just learn to live with that. Not really pssssst hot, the resistors get nicely warm/hot after some time at 3A.
> Your temperatures will stabilize in manner of minutes, not days, so unless you are doing burn-in test, there's no need to leave it on for so long.
> Roman
> PS for my Facebook friends, few hours ago I posted a picture with the load fixture described here.
> W dniu 2014-11-03 13:24, Rob Spencer pisze:
>> Hi,
>> I've recently developed a +-12v PSU, with +5v and post voltage
>> protection and am looking to do some load testing. I know I could
>> stick a low resistance across it but that's going to get very hot
>> very quickly. The other thing I'm thinking is to place some 12v light
>> bulbs across the rails and leave it running for a few days with
>> temperature monitoring in place on the voltage regulators.
>> I'm wondering how other people have tackled this in the past.
>> Cheers
>> Rob _______________________________________________ Synth-diy mailing
>> list Synth-diy at synth-diy.org
>> http://synth-diy.org/mailman/listinfo/synth-diy
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