Quote:
Originally Posted by Al Skierkiewicz
A13,
Are you saying the PD has the high pitch sound? That is normal, some more than others.
If you are saying the Wireless access is emitting a high pitch sound, I don't think there is anything in the box that can do that. I would check the voltage with an oscilloscope or try setting your VOM to AC and measure again. If either of those instruments shows an AC voltage (more than 100mV), there may be a problem with the PD. Eric, have you seen any output caps fail?
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Al,
You are correct in that a failed output capacitor
could damage a radio, but I believe this to be extremely unlikely for the following reasons:
1) I have not seen any failed output capacitors.
2) A single failed capacitor would not cause damage, at least two would need to die.
3) The boost ratio is close to nil for the 12V supply during normal operation.
4) The wall adaptor it is used to being powered has a rather ugly output - the input stage of these things can handle that, so it can handle this case.
If it was "plug into PD, immediate failure", it would point to reverse polarity.
If it was "plug into PD, lights turn on for a while and then failure", it would point to something broken that causes a second breakage.