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Old 21st February 2011, 07:57 PM   #1
OMaudio is offline OMaudio  Germany
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Default speaker pop LM1875

Hello,

i have a speaker pop by Power OFF!

What can i do?


Regards Olaf
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Old 22nd February 2011, 10:32 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
not turn it ON, or not turn it OFF.
You choose which option suits you better.
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regards Andrew T.
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Old 22nd February 2011, 12:45 PM   #3
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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.
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Old 22nd February 2011, 07:25 PM   #4
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Quote:
Originally Posted by AndrewT View Post
Hi,
not turn it ON, or not turn it OFF.
You choose which option suits you better.
Had a bad day?
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If you've always done it like that, then it's probably wrong. (Henry Ford)
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Old 22nd February 2011, 08:36 PM   #5
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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
Attached Images
File Type: png protector.PNG (38.8 KB, 445 views)
File Type: jpg ampli fuente proteccion_1023x768.jpg (151.7 KB, 425 views)
Attached Files
File Type: pdf detector_dc_v2.pdf (154.9 KB, 136 views)

Last edited by electroconico; 22nd February 2011 at 08:49 PM. Reason: Files attached
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Old 24th February 2011, 01:51 AM   #6
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Hi,
Try to use a bleeder resistor across the PS capacitors. They will discharge the capacitors faster minimizing the noise.
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Old 25th February 2011, 04:35 AM   #7
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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!

Last edited by electroconico; 25th February 2011 at 04:38 AM.
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Old 25th February 2011, 04:46 PM   #8
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Quote:
Originally Posted by tauro0221 View Post
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.
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Old 25th February 2011, 06:03 PM   #9
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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.
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Old 25th February 2011, 07:18 PM   #10
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Quote:
Originally Posted by tauro0221 View Post
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 by electroconico; 25th February 2011 at 07:43 PM.
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