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Dual pot in a mono gain circuit
Dual pot in a mono gain circuit
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Old 8th October 2007, 05:51 PM   #1
Netlist is offline Netlist  Belgium
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Default Dual pot in a mono gain circuit

Is there any particular reason why a dual unit pot is used in a single channel circuit (gain)?
The schematic shows 10ka and the pot is a 20ka Alps which is paralleled by the PCB traces.
http://uk.farnell.com/jsp/search/pro...jsp?sku=642990

/Hugo
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Old 8th October 2007, 06:05 PM   #2
Boris_The_Blade is offline Boris_The_Blade  United States
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Can't seem to find a schematic there, but a lot of times dual potentiometers are used to form a constant impedance attenuator.
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Old 8th October 2007, 06:15 PM   #3
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The taper is connected via the 18k resistor to the inverted input of the other half of the 4558.
I can only think that no 10ka was available and they didn't mind spending more production money.

/Hugo
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