This circuit was found in a 1970 American publication. The FETs are power types according to the desired output current. The operational can be replaced for modern equivalents.
This 1 kHz oscillator was found in the February 1970 issue of Radio Electronics magazine. It uses...
The 723 integrated circuit is manufactured by several semiconductor companies with different...
This is a combined circuit of tone generator and preamplifier. We found it in a 1975...