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Old 29th September 2012, 09:16 AM   #51
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No 47.5 ohms
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Old 29th September 2012, 09:18 AM   #52
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What is R2 marked?
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Old 29th September 2012, 09:19 AM   #53
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470=47 ohms
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Old 29th September 2012, 09:21 AM   #54
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OK. It's 10 ohms on both diagrams.

Post the DC voltage on all pins of U201.
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Old 29th September 2012, 09:45 AM   #55
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[QUOTE=Perry Babin;3182707]Post the DC voltage on all pins of U201.

Pin 1: -16.40
Pin 2: -8.13
Pin 3: 0.058
Pin 4: -18.16
Pin 5: 0.058
Pin 6: -17.05
Pin 7: -17.07
Pin 8:-17.98
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Old 29th September 2012, 09:52 AM   #56
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Are you sure that pin 8 is negative?
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Old 29th September 2012, 10:03 AM   #57
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very sure it is negative thats

what the meter says
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Old 29th September 2012, 10:04 AM   #58
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Determine why it doesn't have +15 like the other op-amps.
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Old 29th September 2012, 10:10 AM   #59
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Because R19 is burned in half a 47 ohm resistor maybe? As soon as I replaced R19 and powered up the amp it instantly burned in half again.
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Old 29th September 2012, 10:34 AM   #60
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I found R19 burned in half because the op-amp was sending negative voltage meeting positive voltage at the other side of R19 which supplies the op-amp with positive voltage. Thus burning it in half. Faulty op-amp.

Does this make sense?
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