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Old 24th February 2015, 01:21 AM   #1
aluks is offline aluks  United Kingdom
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Default Preamp with active gain and Balance control

Hello everyone, Im new to this forum and it has helped me greatly as Im building my own 50W integrated amplifier.
So here is the configuration im intending to implement for my pre-amp http://i.imgur.com/9lvOb8z.png
Now here is the circuit with additional balance control too.
http://i.imgur.com/To9LZqa.png
Heres my question would the gain for the new circuit be http://i.imgur.com/JJHbyHJ.png or Im I going wrong somewhere.
Thanks
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Old 24th February 2015, 02:09 PM   #2
aluks is offline aluks  United Kingdom
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Join Date: Jan 2013
Location: Liverpool
its xRV2 thats in parallel and not (1-x)RV2 and the parallel fixed resistor is used to change the control law of the potentiometer to a more logarithmic law i think . This design is from one of cambridge audios preamps maybe they didnt have accurate logarithmic potentiometer suppliers at the time.
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