This shorts the outputs to ground. Remove the connections from the balance control wipers to ground.
Thanks I will make PCB for this circuit and test, the result will post here
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Take care how you wire the balance pot, it's the opposite ends of each of the tracks that connect to earth, ie, not exactly as you've drawn it
In other words:
The right channel balance pot attenuates the right ch as the control is turned counter-clockwise.
Also the left channel balance pot attenuates the left ch as the control is turned clockwise.
Thank you for your remind, when I finished the PCB I Will upload the pic and please help me to check out
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Draw an arrow near each wiper to show the direction the wiper moves
when turning the control clockwise. This removes the ambiguities.
A track type balance control and a switching balance control use a zero resistance half track so that no attenuation occurs in both both channels when the control is centred.
Then progressively attenuates one channel as the control is turned in the other direction.
Then progressively attenuates one channel as the control is turned in the other direction.
Could you draw a picture to help me to understand it?thank you
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How to decided the value of RL and RR? Is it fixed or calculated according the circuit?
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the BC 750k is the balance control.
Note the wiggly symbol for the resistance track.
But the other half is shown as a black _ to indicate zero resistance.
Note the wiggly symbol for the resistance track.
But the other half is shown as a black _ to indicate zero resistance.
The idea is to convert a linear pot to logarithmic, if you read the paragraph that figure 9 is in in the link I posted it tells you how. 33k is used instead of 22k (with 100k lin pot) in the balance circuit to give finer adjustment at the the midway area
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