speaker pop LM1875

OMaudio · 21st February 2011, 07:57 PM

Hello,

i have a speaker pop by Power OFF!

What can i do?

Regards Olaf

AndrewT · 22nd February 2011, 10:32 AM

Hi,
not turn it ON, or not turn it OFF.
You choose which option suits you better.

pmbrunelle · 22nd February 2011, 12:45 PM

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.

pacificblue · 22nd February 2011, 07:25 PM

Quote:

Originally Posted by AndrewT

Hi,
not turn it ON, or not turn it OFF.
You choose which option suits you better.

Had a bad day?

electroconico · 08:49 PM

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

tauro0221 · 24th February 2011, 01:51 AM

Hi,
Try to use a bleeder resistor across the PS capacitors. They will discharge the capacitors faster minimizing the noise.

electroconico · 04:38 AM

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!

pacificblue · 25th February 2011, 04:46 PM

Quote:

Originally Posted by tauro0221

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.

tauro0221 · 25th February 2011, 06:03 PM

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.

electroconico · 07:43 PM

Quote:

Originally Posted by tauro0221

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.

21st February 2011, 07:57 PM	#1
OMaudio diyAudio Member Join Date: Feb 2010	speaker pop LM1875 Hello, i have a speaker pop by Power OFF! What can i do? Regards Olaf

22nd February 2011, 10:32 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, not turn it ON, or not turn it OFF. You choose which option suits you better. __________________ regards Andrew T.

25th February 2011, 04:35 AM	#7
electroconico diyAudio Member Join Date: Jun 2010	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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22nd February 2011, 12:45 PM	#3
pmbrunelle diyAudio Member Join Date: Sep 2005	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.

24th February 2011, 01:51 AM	#6
tauro0221 diyAudio Member Join Date: Nov 2008 Location: Victoria,TX	Hi, Try to use a bleeder resistor across the PS capacitors. They will discharge the capacitors faster minimizing the noise.

25th February 2011, 06:03 PM	#9
tauro0221 diyAudio Member Join Date: Nov 2008 Location: Victoria,TX	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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