Hi,
Problem:
I get a continous knocking sound on my speaker when connected.
History:
I built my LM3886 and connected my CD player source. Was working perfectly fine. When switching on initially, there used to be a knocking sound , and this died within a few seconds and the source played fine.
I later built a pre-amp using NE5532 and this boosted the output very well and I had no problems again except that this knocking sound on the 16 ohm speaker played for a few seconds initially and the source was in. I got some hum and the chip was also heating up. I switched off after about 3 to 4 minutes.
Next day I switch on the same setup (no reconnections ) and connected my source again. This time I dont hear anything except the continous knocking sound which occurs something like two thumps per sec. its something like |^^_|^^_|^^_| where ^ determines the knocking, one second duration between | and |.
The schematic is from ESP site's http://sound.westhost.com/project115.htm . R7 value was 10K.
Any inputs on what the basic problem could be? I am actually planning to rewire the whole thing, but any suggestions would help.
Thanks
Din
Problem:
I get a continous knocking sound on my speaker when connected.
History:
I built my LM3886 and connected my CD player source. Was working perfectly fine. When switching on initially, there used to be a knocking sound , and this died within a few seconds and the source played fine.
I later built a pre-amp using NE5532 and this boosted the output very well and I had no problems again except that this knocking sound on the 16 ohm speaker played for a few seconds initially and the source was in. I got some hum and the chip was also heating up. I switched off after about 3 to 4 minutes.
Next day I switch on the same setup (no reconnections ) and connected my source again. This time I dont hear anything except the continous knocking sound which occurs something like two thumps per sec. its something like |^^_|^^_|^^_| where ^ determines the knocking, one second duration between | and |.
The schematic is from ESP site's http://sound.westhost.com/project115.htm . R7 value was 10K.
Any inputs on what the basic problem could be? I am actually planning to rewire the whole thing, but any suggestions would help.
Thanks
Din
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