This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
Found in documentation from Analog Devices from the 90s, this circuit is intended for interfacing with...
This circuit is from a Popular Electronics from the 90's. The circuit activates a buzzer with...
This circuit was found in a 90s Electronics Now. It generates sinusoidal signals according to the...