Found in a 1964 publication, this circuit makes use of transistors from the time. It operates on frequencies up to 3 kHz.
This amplifier can be used for public-address or other applications. Three transistors of the time...
This circuit was found in a 1967 Electronics World. The circuit uses components of the time that...
This circuit was obtained in a June 1987 magazine Hands-On. It is a circuit that indicates on an...