Obtained in a 1969 Ferranti documentation, this circuit dissipates only 2.2 mW with 4.5 V. The circuit can be designed based on modern equivalent transistors.
The transformer inf this circuit is a 6 or 9 V unit and diodes 1N4002. The filter capacitor is 2...
This vibrato circuit was found in Motorola's 1966 documentation. The circuit uses transistors of the...
Found in a General Electric documentation from 1970, this circuit consists of a relaxation...