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Old 30th May 2008, 07:40 AM   #1
norstar815 is offline norstar815  Philippines
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Location: manila
Default 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


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Old 30th May 2008, 05:08 PM   #2
jaycee is offline jaycee  United Kingdom
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Location: Norwich, UK
Do you mean this circuit?
Click the image to open in full size.

If so, you can just leave out one of the 22K resistors, and associated speaker connection.
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Old 31st May 2008, 10:35 PM   #3
dutch diy is offline dutch diy  Netherlands
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Default Speaker protect


Maybe this device can work for your sub-protection.


J-amp powers Avantgarde-Acoustic Trio
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Old 31st May 2008, 11:31 PM   #4
Nordic is offline Nordic  South Africa
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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)...
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Old 1st June 2008, 04:40 AM   #5
bigpanda is offline bigpanda  Hong Kong
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Hi jaycee,

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