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Dual Channel Digital Volume Control

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                                                                                                          CIRCUIT        IDEAS




Dual-Channel Digital                                                                       mum count being 15 (all outputs logic
                                                                                           1) and minimum count being 0 (all out-
                                                                                           puts logic 0), it results in maximum and

Volume Control                                                               . DH
                                                                                 ILLO
                                                                                     N
                                                                                           minimum volume respectively.
                                                                                               The active high outputs A, B, C and
                                                                                           D of the counter are used for control-
                                                                                           ling two quad bi-polar analogue switches
                                                                        A.P.S              in each of the two CD4066 ICs (IC3 and
SHEENA K.                                                                                  IC4). Each of the output bits, when high,
                                                                                           short a part of the resistor network com-


T
        his circuit could be used for re-     quency pulses to up/down clock input         prising series resistors R6 through R9
        placing your manual volume con-       pins of pre-setable up/down counter          for one channel and R10 through R13
        trol in a stereo amplifier. In this   74LS193 (IC2) via push-to-on switches        for      the         other       channel,
circuit, push-to-on switch S1 controls the    S1 and S2. To vary the pulse width of        and thereby control the output of the
forward (volume increase) operation of        pulses from IC1, one may replace tim-        audio signals being fed to the inputs of
both channels while a similar switch          ing resistor R1 with a variable resistor.    stereo amplifier. Push-to-on switch S3
S2 controls reverse (volume decrease)             Operation of switch S1 (up) causes       is used for resetting the output of
operation of both channels.                   the binary output to increment while         counter to 0000, and thereby turning
    Here IC1 timer 555 is configured as       operation of S2 (down) causes the bi-        the volume of both channels to the mini-
an astable flip-flop to provide low-fre-      nary output to decrement. The maxi-          mum level.




                                                     ELECTRONICS FOR YOU n  AUGUST '99

				
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