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Chip Amps Amplifiers based on integrated circuits

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Old 23rd March 2005, 04:47 PM   #21
Wyloch is offline Wyloch  United States
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Join Date: Dec 2004
Location: Classified
Oh, man. The symptoms you're describing sound exactly like what I was getting when I was working on my first one. The answer is probably not your problem, givin that you're far from being an amateur, but it came down to the wire I was using to go from my CD player to the amp input jack. It was a standard 1/8 mini to mini, except it only had one ring on the tip: it was mono. I switched it out for a cable with two rings on the tip and the damn thing sprang to life. Again, probably not your problem, but what you're describing matches so closely I though it was worth mentioning.

Provided that that is not the problem, can you post a pic of the PCB you're using? I always just use protoboard...

ALSO, moreoever, where exactly are you? Have you wired up the input/output jacks yet? Do you have a pot or LED in there? Is it in the chassis yet? Or are you still in testing with alligator clips?
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Old 23rd March 2005, 10:26 PM   #22
Bose(o) is offline Bose(o)  Canada
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Join Date: Dec 2001
Location: Ottawa, Ontario, Canada
Thank you for replying Wyloch!

I'll swap my cable none the less, it's from Ratshack and I figure it's been screwing up the audio for my tuner card.

I'm at about the 7th rebuild of the circuit, I have everything on my breadboard (no pcb or proto yet), so I can easily swap and make adjustments, measurements, etc.

Not sure if this will help, but throwing in a sine wave (full blast, 0dB. 100Hz.) input voltage = 0.678V (pin 3), pin 2 (inverting input) ~ 0.330V and pin 1 (output) ~0.0166V. This is definitely not gaining at all.

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