10H2 to 2MH2 frequency counter circuit

The 7208 seven-stage decimal counter can be used as the frequency counter, it has the latch and multiplexing functions, and it has the direct digital driving circuit and the display driving circuit. 7207IC 6.5536MHZ crystal oscillator`s output frequency is divided by 2K to create the 1600HZ square wave for the multiple conversions of the calculator and the m..

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