Delay Amp power up using a relay.

HAUDIO · 20th June 2011, 03:48 PM

Newbie learning here.
After months of reading lots of useful information I'm finally doing my first post.

I have a setup like the following:
Preamp -> DSP -> Power Amp
When turning on I'm getting a loud pop from the DSP and another when turning off from the preamp. One of the turn on pops already destroyed a tweeter so I'm trying to delay powering up the amp using a micro controller and relay circuit.
I already built a test circuit based on this with a 12V 3 amp relay but think that the relay wouldn't handle the amp load.

My question is what kind of relay should I get and where could I get it?
Here is what I have:

Amp module:Sure 4x100W @ 4 Ohm TK2050 Class-D Audio Amplifier Board
Computer PSU to power it up (12 Volts)
microcontroller with 5 volt 100ma signal.

Thanks in advance

smartx21 · 20th June 2011, 06:01 PM

The Loudspeaker Protection http://www.nabucoeletronica.com.br/d...-schematic.pdf described in this website www-dot-dx-dot-kinghost-dot-net works pretty fine, connecting speakers only after a few seconds since the amplifier has been turned on. And also disconnects speakers immediately after amplifier has been turned off.

AndrewT · 20th June 2011, 06:15 PM

read ESP. He has published a variety of projects for controlling start-ups and shut downs.

HAUDIO · 21st June 2011, 02:36 AM

Thanks for the quick replies SMART21 and ANDREWT.
I was hoping to do the relay at the dc stage of the amp board but after reading the pages you pointed it seems that it should be done at the speaker level.
What disadvantage would I get by having the relay before the amp DC input?

20th June 2011, 03:48 PM	#1
HAUDIO diyAudio Member Join Date: Apr 2011	Delay Amp power up using a relay. Newbie learning here. After months of reading lots of useful information I'm finally doing my first post. I have a setup like the following: Preamp -> DSP -> Power Amp When turning on I'm getting a loud pop from the DSP and another when turning off from the preamp. One of the turn on pops already destroyed a tweeter so I'm trying to delay powering up the amp using a micro controller and relay circuit. I already built a test circuit based on this with a 12V 3 amp relay but think that the relay wouldn't handle the amp load. My question is what kind of relay should I get and where could I get it? Here is what I have: Amp module:Sure 4x100W @ 4 Ohm TK2050 Class-D Audio Amplifier Board Computer PSU to power it up (12 Volts) microcontroller with 5 volt 100ma signal. Thanks in advance

20th June 2011, 06:01 PM	#2
smartx21 diyAudio Member Join Date: Mar 2010 Location: Santiago, RS/ Brasil	The Loudspeaker Protection http://www.nabucoeletronica.com.br/d...-schematic.pdf described in this website www-dot-dx-dot-kinghost-dot-net works pretty fine, connecting speakers only after a few seconds since the amplifier has been turned on. And also disconnects speakers immediately after amplifier has been turned off. __________________ We should not dwell on what we do not have, but, instead, be grateful for what we do have!

20th June 2011, 06:15 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	read ESP. He has published a variety of projects for controlling start-ups and shut downs. __________________ regards Andrew T.

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21st June 2011, 02:36 AM	#4
HAUDIO diyAudio Member Join Date: Apr 2011	Thanks for the quick replies SMART21 and ANDREWT. I was hoping to do the relay at the dc stage of the amp board but after reading the pages you pointed it seems that it should be done at the speaker level. What disadvantage would I get by having the relay before the amp DC input?

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