Frequency meter (CB7383E)

Found in a Popular Electronics from the 90s, this circuit reaches 100 kHz and battery power is recommended.

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LM331 Voltage Ratio do Frequency Converter (CB14436E)
This circuit converts the relationship between two input voltages into a frequency. The circuit was...
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Intended for amplification of signals in the 1.7 MHz to 1 30 MHz range, this circuit uses a dual...