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This circuit could be used
for replacing your manual volume control in a stereo
amplifier. In this circuit, push-to-on switch S1 controls
the forward (volume increase) operation of both channels
while a similar switch S2 controls reverse (volume decrease)
operation of both channels.
A readily available IC from
Dallas semiconductor, DS1669 is used here.
mechanical variable resistors
interface provided for digital as well as
differential input voltage range between
4.5 and 8 volts
position is maintained in the absence of
alternative to mechanical controls
include volume, tone, contrast,brightness,
and dimmer control
circuit is extremely simple and compact requiring
very few external components.
power supply can vary from 4.5V to 8V.
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