I think Jedrider has it right...

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In Reply to: RE: Baffled by a switch mode power supply problem. posted by jedrider on March 30, 2021 at 10:21:40:

The thing wants to see some voltage above 12V at its input, probably because it has its own internal regulators that drop some voltage. If you don't feed it enough to trigger, it's dead. I had the same or a similar experience with a linear supply I built for a solid state phono stage. The preamp had markings on its PS input socket stating the min and max DC voltages it wanted to be fed, so I knew what my problem was in that case.

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Follow Ups Full Thread

Topic - Baffled by a switch mode power supply problem. - mg16 10:28:12 03/29/21 (7)

RE: Baffled by a switch mode power supply problem. - jedrider 10:21:40 03/30/21 (1)

I think Jedrider has it right... - Lew 18:19:19 04/09/21 (0)

That is weird. Polarity reversed maybe? (nt) - Jonesy 10:56:27 03/29/21 (4)

RE: That is weird. Polarity reversed maybe? (nt) - mg16 11:32:19 03/29/21 (3)

Or... existing adapter is non SMPS? - Jonesy 12:28:44 03/31/21 (0)

RE: That is weird. Polarity reversed maybe? (nt) - Duster 15:42:19 03/29/21 (1)

RE: That is weird. Polarity reversed maybe? (nt) - mg16 08:35:35 03/30/21 (0)

Follow Ups

I think Jedrider has it right... - Lew 18:19:19 04/09/21 (0)

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