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.
Hi,
not turn it ON, or not turn it OFF.
You choose which option suits you better.
Had a bad day?
Hi
I use this circuit with my tda2050 sytem. It's simple and have few components.
Features
DC protection
Delay Power On
AC cut Off
No Pop On-Off
Tested!
Files attached
I use this circuit with my tda2050 sytem. It's simple and have few components.
Features
DC protection
Delay Power On
AC cut Off
No Pop On-Off
Tested!
Files attached
Attachments
Last edited:
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!
The hard click noise is from ac main switch , the soft click is from relay.Dlay +- 1.5seconds
regards!
Last edited:
Try to use a bleeder resistor across the PS capacitors. They will discharge the capacitors faster minimizing the noise.
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.
Hi,
I listen to your video and the only noise is the mechanical noise. It is what the noise your are talking about? I can not heard the speaker noise.
Yes , only mechanical noise, no pop on-off noise. There´s a soundtrack.
Let me do a better video.
Last edited:
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.
Last edited:
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?
Hi,
I listen to your video and the only noise is the mechanical noise. It is what the noise your are talking about? I can not heard the speaker noise.
I don't hear any objectional speaker pop either.
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