Steam locomotive (T315E)

This 1967 modeling circuit mimics the whistle of a locomotive. The steam-shrieking wheezing is set in a 2k2 potentiometer.

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Audible Direction indicator (CB7116E)
Found in a Popular Electronics from the 90s, this circuit uses a double 555 to emit beeps when the...
Simple field strength meter (CB4114E)
The more sensitive the instrument used the better the sensitivity of the indicated meter. We...
Adafruit Breakout PDM Microphone
Adafruit Breakout PDM Microphone This Adafruit tested microphone card is available from Mouser...