Use a relay to disconnect the speaker when you turn off the amplifier.
A simple way would be to use a mains voltage relay (switching the speaker outputs), connected in parallel with the transformer primary.
Then, the relay will turn off (and disconnect the speakers) before your capacitor banks discharge.
I wouldn't fuss with it for a woofer (who cares) or multi-way speaker. Only if the amplifier is driving a tweeter.
A simple way would be to use a mains voltage relay (switching the speaker outputs), connected in parallel with the transformer primary.
Then, the relay will turn off (and disconnect the speakers) before your capacitor banks discharge.
I wouldn't fuss with it for a woofer (who cares) or multi-way speaker. Only if the amplifier is driving a tweeter.
Here´s a short 
video of the speaker protection
The hard click noise is from ac main switch , the soft click is from relay.Dlay +- 1.5seconds
regards!
video of the speaker protection The hard click noise is from ac main switch , the soft click is from relay.Dlay +- 1.5seconds
regards!
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This must be a misunderstanding. The bleeders discharge the capacitors when the amp is switched off. Noise should not be an issue by that time. While the amp is on, the bleeders do nothing except convert some electric energy into heat. They don't reduce noise.
Yes , only mechanical noise, no pop on-off noise. There´s a soundtrack.
Let me do a better video.
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Here it is.
Left side is my mp3 player , rigth side is the speaker protector / amp / speaker.
It had max volumen.
You can see how the speaker prototector led turned On and sound come out without pop noise.
Left side is my mp3 player , rigth side is the speaker protector / amp / speaker.
It had max volumen.
You can see how the speaker prototector led turned On and sound come out without pop noise.
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Hi,
This is may sound silly but did you try to cover the relay with a foam? Maybe you can try another relay that are not so noisy. I think you may try lowering the relay voltage or bring slowing the relay voltage. You may increase the R3 to slowly charge the capacitor and removed the J3 transistor and make a jumper from the base of J3 to the J3 emitter. This will slowly bring the collector voltage of the J4 until the relay close. Now why the mechanical noisy bother you?
This is may sound silly but did you try to cover the relay with a foam? Maybe you can try another relay that are not so noisy. I think you may try lowering the relay voltage or bring slowing the relay voltage. You may increase the R3 to slowly charge the capacitor and removed the J3 transistor and make a jumper from the base of J3 to the J3 emitter. This will slowly bring the collector voltage of the J4 until the relay close. Now why the mechanical noisy bother you?
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