One more idea for those who are more into digital: If we use one 4047 to generate highest Nogier frequency - 4,672kHz, we can drive series of J-K Flip Flops which will divide incoming frequency by 2. Their Q output will be 1/2 of incoming signal, so the square output of second IC will be 1/4 of the clocking signal. By adding more Flip Flops we can get precise division all the way to 73Hz. Just an idea to try it.
Thanks
Vtech
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