Products > Test Equipment
Inside the new Korad KA3305P linear PSU
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torch:
Not quite what you asked for, more like "a punishing pulse test", but instead of using the on/off button, here I left the PSU on, made contact with then dragged a wire across a coarse file to repeatedly break the circuit. There's an interesting initial brief voltage spike before it ramps up as the bulbs start glowing. Because the load is inductive? Because the resistance increases dramatically as the bulb starts to heat up?

Salas:
It can't recover so fast to hold a resemblance of a DC line on that. Using the file on a PSU rings a bell but I can't recall exactly. Was it some guru like Bob Pease or Jim Williams who did it first? Good it did not break something. At least now you know its tough. Money well spent.
Hmm... How a classic linear chip like 78XX, 317 etc. would react when dragged along that file for a load it could bear? That could give some kind of scaled down screenshot comparison.
dom0:

--- Quote from: Salas on September 07, 2015, 08:53:49 am ---How a classic linear chip like 78XX, 317 etc. would react when dragged along that file for a load it could bear? That could give some kind of scaled down screenshot comparison.

--- End quote ---

Not much, as stability is mostly an issue with "discrete" (i.e. op amp based) PSUs, while the integrated emitter-output regulators are very stable (they don't have a lot of loop gain to begin with and their fT is in the region of 500-1000 kHz). So output waveform will mainly depend on the output capacitor.
george graves:
Can't say I'm a fan of that user interface.  Too bad they didn't make more room for it.
torch:

--- Quote from: Salas on September 07, 2015, 08:53:49 am ---Using the file on a PSU rings a bell but I can't recall exactly. Was it some guru like Bob Pease or Jim Williams who did it first?
--- End quote ---

I can't say I know of the file test being applied to a PSU. However, it's certainly not original to me: it is an old trick for down-and-dirty testing of automotive ignition coils. Scrape the primary wire along a coarse file and look for a series of sparks jumping a gap tester attached to the secondary.
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