This alarm oscillator was found in the December 1974 issue of Radio Electronics magazine. The power transistor must be equipped with a good heat sink. The Frequency basically is given by C1.
This circuit with the PA7601 was found in a 1967 Philco-Ford documentation. The circuit has a pass...
This good quality stereo amplifier was found in a Japanese publication from the 1960s. The circuit...
This circuit was found in an English publication from 1967. The circuit is for listening on a...