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Tenma 72-8695 2 x 32v 3A + 5V @ 2A mini-review / teardown

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Daz:
Thanks. So the regulators are only using the chassis as a heatsink... that's interesting, I understand now.

There are a few other brands of 3 channel PSU in the same price range... I wonder if their fixed 5v channels also have -ve connected to chassis ground? This is the kind of info that's not shown in the spec!

Am I right about not using a scope on channel 3 of this PSU if -ve is connected to chassis earth?

Thanks.

Geoffa:
Hi ,

Does anyone have a circuit giagram for Tenma 72-8695 with the PCB 20100521 ?
Will be much appreciated to repair - otherwise excellent PSU.

F1GWR:
As this contains a toroidal transformer, does this power supply contain transil diodes to avoid high voltage kick back at switch off?
Cause it's already three 74HC ICs powered through a 78L05 that died unexpectedly...

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