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Digital Double Volume Control
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This circuit can be used as a digital stereo master volume control in audio applications.
Using a special IC designed to satisfy this purpose reduced the circuit compiexity and
made it simple.
The circuit specification:
* Voltage supply: +6V ~ +12V
* Current consumption: 1 ~ 3 mA
* Signal attenuation: 0 ~ -68dB (32 steps)
* Maximum input signal level: 4 Vrms
* Frequency response: up to 650KHz
* Distortion: 0.01%
The input stereo signal is applied to the pin1 of connectors J1 and J2, and the output is received from the pin2 of
the connectors. This integrated circuit mimic a potentiometer (resistive volume control) where one of two fix pins
is gounded. With the push-buttons UP and DOWN indicated in the circuit diagram, someone can change the volume in
32-step. Please note that if you hear the output sound episodic, the input signal level is too high. The LM358 OpAmp
is used in the circuit as buffer units for left and right channels. For more details, please see the datasheet of
PT2253 from Princeton Technology Corp.
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