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20 binary counter using CD4017

As shown on the grounds of two CD4017, a CD4066 and a CD4013 binary counter circuit 20 together form. Including IC3, IC4 used as a counter, IC2 IC3 or IC4 used to connect the power supply and counting pulse input channels, IC1 is used to control or IC4 IC3 IC2 is connected to the power supply and counting pulse input channels. C1, R2 components IC1 IC3 reset circuit and the circuit is set to 1. C2, R3 component of the reset circuit IC4. VD1, VD2 conversion control circuit for the counter isolation diodes.

20 binary counter using CD4017.