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Old 24th December 2012, 05:18 PM   #21
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Scope set to 5 ms 10 volts/div

200 hz sine wave


First pic is on the positive terminal

2nd pic is the negative terminal
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File Type: jpg Earthquake 1.JPG (208.7 KB, 56 views)
File Type: jpg Earthquake 2.JPG (198.3 KB, 52 views)
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Old 24th December 2012, 05:57 PM   #22
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Do you have a triangle waveform on pin 6 of the 4080?
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Old 24th December 2012, 06:05 PM   #23
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Yes
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Old 24th December 2012, 09:35 PM   #24
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Do you have audio on pin 7?

Does this amp have pull-down resistors on the output transistors?
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Old 25th December 2012, 01:36 AM   #25
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It has audio on Pin 7 but its clipped the bottom of the sine wave is flat..

Yes the outputs have pulldown resistors..
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Old 25th December 2012, 12:18 PM   #26
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If you're absolutely sure that it has pull-down resistors on the outputs, remove the 4080 and see if it has a clean signal on pin 7.
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Old 25th December 2012, 09:39 PM   #27
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Pulled the HIP4080 and tested for audio on Pin 7 I get a square wave on Pin 7 so the audio is clipped
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Old 25th December 2012, 09:45 PM   #28
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Do you get clean audio if you short pins 8 and 9 of IC2?
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Old 25th December 2012, 10:04 PM   #29
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Yes
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Old 25th December 2012, 10:14 PM   #30
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That would seem to indicate that the components feeding the 4080 are OK. Remove the jumper.

Do you get clean rail-rail oscillation on the output transistors?
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