This circuit was found in Ferranti's 1974 transistor manual. The transistors are from the period and the frequencies generated are between 50 Hz and 2 kHz.
This voltage controlled oscillator, which can be used as a shield, generates signals in the 1.5...
This circuit was obtained from the 1976 Siemens integrated circuits manual. It is the circuit for...
This instrumentation circuit was found in the September 1989 Radio Electronics magazine. The...