Digital Volume Circuits

The principle is very simple: replace the turn potentiometer with digital volume control circuit. But there are some things worth noting. To realize the reader needs to understand the scheme of the circuit shown in the picture. For the images shown are can lead you to assemble and connect the equipment functioned.
Work Series: A series of digital volume control IC uses 9. To operate the voltage regulator circuits required for 12 Volts. IC1 (555) very well to function as a flip-flop. Frequency or period can be determined by memilh value resistors R44, R45 in combination with the capacitor C6. In this series has a 0.3 second period.

Part list :
R1, 2, 3, 4 : 560R R16 : 1,5K R45 : 150K
R5 : 680R R17 : 3,3K C1 : 0,01uF
R6, 8 : 100K R18 : 5,6K C2, 3 : 100nF
R7 : 1M R19 : 8,2K C4 : 1uF/50V
R9 : 10R R20 : 15K C5 : 100nF
R10 : 12R R21 : 33K IC1 : 555
R11 : 42R R22 : 56K IC2 : 74193
R12 : 100R R23 : 1,5M IC3 : CD4067
R13 : 220R R24...R39 : 560R IC4 : CD4067
R14 : 470R R40..R43 : 4,7K IC5 : 7805
R15 : 820R R44 : 330K IC6 (N1-N4) : 7407

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