This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time. The power is from a battery, the consumption of 1.65 mA and the power of about to 1 mW.
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...