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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Continuity Tester (CB4351E)
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
40W Transistorized Amplifier (CB11574E)
This circuit consists of a traditional amplifier version with complementary output using BD series...
Basic Monostable Using the 7555 (CMOS) (CB120E)
The CMOS TLC555 [equivalent to the bipolar 555] can be used as a monostable in the configuration...