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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Tachometer (CB4960E)
We found this version of the automotive tachometer in a 1980s publication. Variations from other...
Two Transistor Audio Stage (CB458)
This circuit can be used as a low Power audio booster for experimental projects such as radios,...
AVX W2S Feedtrough Surface Mount Capacitors
June 2017 - These new AVX capacitors are suitable for filter applications, considerably reducing...