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Old 12th September 2004, 07:22 PM   #1
dvdwmth is offline dvdwmth  Canada
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Join Date: Apr 2004
Location: Toronto
Default cap on speaker causing amp to cut out

I just finished assembling my lm3876 amp and I'm very pleased. At first I had it running on a pair of RS 1187s no problem. Sounded amazing. Then I decided to try it with my tang band w3871s' which have a 100uf 100v cap on them and after about 10 seconds the right channel went silent followed by the left a couple of seconds later. The only thing I could think of that was different between the two speakers was the cap on the Tang bands. When I removed it the problem went away.

Aside from this everything is working flawlessly. No hum, just good sound.

Can anyone tell me what is happening here?

This isn't really a big problem at the moment since I dont really listen that loudly and the speaker seems to be surviving without the protective cap, but my next speaker project is going to be a two way and Im worried the crossover will bring about the same problem.

By the way, I am just assuming that it is the amp cutting out. I dont know why else the signal would cut out but perhaps there is another explaination.

Thanks
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Old 12th September 2004, 10:00 PM   #2
markp is offline markp  United States
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Join Date: Oct 2003
Location: L.A., CA
It sounds like you've got the cap in parallel with the speaker and not in series with it. The amp will shut off if you try to drive a pure capacitor load which is what happens if the cap is in parallel with the driver. Look at how its wired up and if you think its right try putting a 4ohm resistor in series and see if it still turns off.
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