Found in the September 1972 issue of Radio Electronics magazine, this signal injector is based on the HEP580. The circuit is powered by two batteries and its frequency is basically given by C1.
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...
This circuit was found in a Dutch documentation from 1970. The circuit makes use of semiconductors that...
This circuit has both frequency and duty cycle control. We found it in the October 1992 Radio...