This toy transistorized organ was found in the May 1970 issue of Radio Electronics magazine. The trimpots are adjusted to the musical notes according to the key.
This circuit was found in a Raytheon transistor manual from the 1960s. The transistor is...
This circuit takes advantage of the noise generated at the junction of a zener diode of any type....
Found in an EEE from 1970, this circuit supplies a voltage of 12 V DC x 10 mA current from the...