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Old 15th February 2003, 09:03 AM   #1
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Default transducer's balanced phono amp

Quote:
Originally posted by transducer


I'm not sure, I didn't own a scope at the time. What was happening was that only one channel would work. If I touched the ground of the input RCA jack, both channels worked. I had originally had the small caps in place and the unit worked fine. Upon removing them it started to cut out on me.

The design is a balanced input using a BB INA103 opamp, although I use RCA jacks for input, both the hot AND ground are isolated from the chassis. The circuit is basically stolen from the BB app notes, with a passive RIAA network from the Analog Devices applications guide, and then an OPA604 output (will soon replace with OPA627.

Cheers,
RonS
Thread from my 1% polyprop discussion.

Ron, have you thought about that the signal from your pickup is floating but if you want to use this "balanced" signal you must change cable, a shieled pair cable or two shielded cables per channel.

Check Klaus Böning and his balanced amp ”La Bohème”

http://www.klaus-boening.de/
http://www.klaus-boening.de/html/laboheme.html

Check especially his balanced inputs.
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