it may exhibit a hiss or whistle
it may run hot at idle
it may burn a small resistor accross the output
if you can monitor the mains current it may raise with a load
if it's at a low level it's hard
it may run hot at idle
it may burn a small resistor accross the output
if you can monitor the mains current it may raise with a load
if it's at a low level it's hard
Unfortunately, smoke is usually the first and only sign of the bad sine.🙁 In fact, even with a good scope, such oscillations may be too high for it to see.
Of course if the amp has a stable design to begin with...🙂
Of course if the amp has a stable design to begin with...🙂
Oscillation
Might I suggest mysteriously blowing tweeter fuses too. Sounds like an amplifier is trying to be a transmitter, eh?
Might I suggest mysteriously blowing tweeter fuses too. Sounds like an amplifier is trying to be a transmitter, eh?
A lightbulb in series with a 100nF -> 1uF capacitor on the output works. The cap blocks any DC content in the output but AC oscillations pass straight through lighting the bulb for all to see.
Obviously, you need to size the bulb to your power rails.... A 12v car bulb with a series resistor would work.
Nice one,
David.
Obviously, you need to size the bulb to your power rails.... A 12v car bulb with a series resistor would work.
Nice one,
David.
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