The Circuit
The counter circuit is designed using discrete digital ICs. The number of ICs are more in this design. However the cost of the counter well lower that a single IC design. The circuit is capable of counting up, counting down and also capable of programming initial value. This feature is often required if you want to know the frequency of a station tuned by using your super heterodyne receiver. We can display the station tuned in by measuring the local oscillator frequency. The actual frequency is + or - , if the frequency from the local oscillator frequency. The IF frequency can be loaded by using the dip switches on the counter board (BCD value).