speaker protect

norstar815 · 30th May 2008, 07:40 AM

Hello guys,

As i know, most of the speaker protect i have seen is for two channels, left and right.

Now, a friend bought a preamp from junk shop but needs 3 amps
i.e. left-right and a sub. I told him to use the M250 speaker protect but needs one more for the sub and i can't find single one.

Needs some help here, i am a newbee and just starting to learn some basic electronics but sure can make my own if theres enough guide to follow. A schem, pcb with parts placement will be
fine.

thanks.

john

jaycee · 30th May 2008, 05:08 PM

Do you mean this circuit?

If so, you can just leave out one of the 22K resistors, and associated speaker connection.

dutch diy · 31st May 2008, 10:35 PM

Hi,

Maybe this device can work for your sub-protection.

http://quadrevisionspot.blogspot.com/2008/03/dada-loudspeaker-protection-delay-pre.html

Jos

Nordic · 31st May 2008, 11:31 PM

If I understand you allready have a 2 channel protection...

Look at the inputs... I suspect you will see they are both connected to the same point.. pin on the module, only seperated by 2 resistors..... it this is the case... you can hardwire another resistor into that point to add a 3rd cahnnel...

Lol, I actualy tested a protection module to destruction levels tonight, shot a nice big chip off the chip even made a small flame, but it died quickly. (lol, pun, I know)...

bigpanda · 1st June 2008, 04:40 AM

Hi jaycee,

Your link for the circuit doesn't seem to work, think you can show it again?

30th May 2008, 07:40 AM	#1
norstar815 diyAudio Member Join Date: Jun 2004 Location: manila	speaker protect Hello guys, As i know, most of the speaker protect i have seen is for two channels, left and right. Now, a friend bought a preamp from junk shop but needs 3 amps i.e. left-right and a sub. I told him to use the M250 speaker protect but needs one more for the sub and i can't find single one. Needs some help here, i am a newbee and just starting to learn some basic electronics but sure can make my own if theres enough guide to follow. A schem, pcb with parts placement will be fine. thanks. john __________________ norstar815

31st May 2008, 10:35 PM	#3
dutch diy diyAudio Member Join Date: May 2001 Location: NL, The Hague	Speaker protect Hi, Maybe this device can work for your sub-protection. http://quadrevisionspot.blogspot.com/2008/03/dada-loudspeaker-protection-delay-pre.html Jos __________________ J-amp powers Avantgarde-Acoustic Trio

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30th May 2008, 05:08 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Do you mean this circuit? If so, you can just leave out one of the 22K resistors, and associated speaker connection.

31st May 2008, 11:31 PM	#4
Nordic diyAudio Member Join Date: Sep 2005	If I understand you allready have a 2 channel protection... Look at the inputs... I suspect you will see they are both connected to the same point.. pin on the module, only seperated by 2 resistors..... it this is the case... you can hardwire another resistor into that point to add a 3rd cahnnel... Lol, I actualy tested a protection module to destruction levels tonight, shot a nice big chip off the chip even made a small flame, but it died quickly. (lol, pun, I know)...

1st June 2008, 04:40 AM	#5
bigpanda diyAudio Member Join Date: Jun 2004 Location: HKSAR	Hi jaycee, Your link for the circuit doesn't seem to work, think you can show it again?