Lets talk about Frequency counters


Joined Jan 1, 2020
That circuit appeared in an old Engineer's Notebook II sold and distributed by Radio Shack and written by Forrest M. Mims III first printing 1982 pages 34 & 35. There is a three digit, half the complete version, also. I actually used it along with a reflective photo cell (LDR) circuit involving V to F. When I used it it worked fine. The V to F was a FV9400 I think. That was a long, long time ago. :)

I have that book.
I’ve seen the circuit.
Here’s a compilation of his work