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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Direct conversion receiver for radio amateurs (CB8205E)
This circuit was obtained in a 90s Popular Electronics. In the table the values of the components...
BCP56H Medium Power NPN Transistors 80 V 1 A
May 2017 - Mouser Electronics is already in stock with the new BCP1395 transistors from Nexperia....
Linear switch using FET (CB6919E)
Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the...