On Sun, Mar 30, 2025 at 02:25 PM, Jerry Gaffke wrote:
Strikes me as a very bad idea to apply reverse power to the QMX from your power supply, if that is what you did.
You could wind up with a whole bunch more problems to diagnose.
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I don't buy this, sounds like FUD to me.
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My meter in diode mode generates 3.9V and, crucially 1.5mA.? This into a circuit that's protected from reverse voltage by the TVS diode, Q103 and Q105.? A lot needs to be broken before this gets anywhere where harm could be done and the 1.5mA max current will also help.? In continuity check it's more like 2V and 0.25mA.
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The point I was making in the rest of the post was that by being careful with the power supplied, using low voltage and current limits my QMX was preserved.
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