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Old 9th June 2011, 08:19 PM   #11
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Everything from the output of the opto-coupler to the driver float with the source leg of the output transistors. This includes the 10v supplies. The other half of the amp is different. Email me if you want a diagram of the BD amps.

babin_perry@yahoo.com
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Old 9th June 2011, 08:38 PM   #12
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you have sent me one already,.
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Old 19th June 2011, 03:02 AM   #13
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Replaced the LM6171, and the amplifier is stable and working fine.

How did you know the op-amp was defective? That way i know for future reference.
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Old 19th June 2011, 03:41 AM   #14
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With the inverting input higher than the non-inverting input, the output should have been near the negative rail.
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