Found in a 1970s documentation, this mini-organ toy circuit makes use of an integrated circuit from that time. This component is difficult to obtain today.
This 6V microsupply with just 2mA current uses a common 1N34 germanium diode. The circuit was...
This electronic siren circuit, found in a 1982 documentation, uses three oscillators mounted...
This integrated circuit is recommended as a standard amplifier in sound equipment, TV sets,...