If you drive a strong signal into the amp, do the channels that pop mute to the same level (before end of mute delay) as the quiet channels?
This would best be done by monitoring with a scope with no load since a signal strong enough to be useful will likely drive the amp into hard clipping when the muting ends.
This would best be done by monitoring with a scope with no load since a signal strong enough to be useful will likely drive the amp into hard clipping when the muting ends.
I have tryed.
With 3v input and ampli gain to max, on the "pop" channel i have 15V level output, on the good channel i have 20V level output
The output are semi-sine wave, positive
Picco,
I don't believe you have mentioned what the DC voltage is on the offending speaker outputs. Also, what is the DC voltage at the op amp outputs?
Looking at the schematic posted by Perry, any offset from the op amp will go to the speakers. Excessive offset from the op amp may not be fully muted, as Perry has mentioned.
It may be that the main amp simply has pop, and it's normal, and you just have to learn to live with it. That SS amp is from the days when designers were not so obsessive about making start-up totally inaudible.
--Russell
I don't believe you have mentioned what the DC voltage is on the offending speaker outputs. Also, what is the DC voltage at the op amp outputs?
Looking at the schematic posted by Perry, any offset from the op amp will go to the speakers. Excessive offset from the op amp may not be fully muted, as Perry has mentioned.
It may be that the main amp simply has pop, and it's normal, and you just have to learn to live with it. That SS amp is from the days when designers were not so obsessive about making start-up totally inaudible.
--Russell
With 2.5v input, i have on the "pop" channel semi-sine wave with 2v level, on the good channel 0v
I have no DC voltage on the speakers output (both good and bad channel) and have no dc voltage on op-amp output.
Maybe is normal pop for this amplifier, but i have four soundstream lil wonder 3a gen. Amplifier and all without power on pop.. this is strange
Above is from post #18.
You stated that you have from 0.01-0.09v on the resistors. Does this drop to 0v on all if you leave the amp off for longer
If you leave the amp off longer is the pop less or more than if you cycle the amp quickly?
The pop don't is emitter-voltage depend. This voltage is variable, also after more time, is variable from 0.09v to 0v..
After more on -off quickly sequence(1-2sec), i have no pop, if i wait muting-off, and then power off, now i have the pop.
Short terminals 1 and 2 of the optocoupler. Leave the amp off 5-6 minutes (long enough for no pop).
With the optocoupler shorted, does any channel pop?
If not, does any time off make it pop?
With the optocoupler shorted, does any channel pop?
If not, does any time off make it pop?
Terminal 1 and 2 or 3 and 4? Find optocoupler pinout in attached
Attachments
Remove the bridge.
What's the DC voltage across terminals 1 and 2 before the end of the mute delay?
What's the DC voltage across terminals 1 and 2 before the end of the mute delay?