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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Logarithmic photometer LM10 (CB14329E)
We found this circuit in the National Semiconductor Linear Applications Handbook of 1994. The...
Simple mixer (CB917E)
This is 4-input audio mixer using an integrated circuit 741 and two more operational amplifiers....
Hybrid H Bridge (CB11282E)
This shield circuit for controlling the direction of rotation of DC motors with current up to 500...