This circuit was found in Texas Instruments documentation from 1968. The transistors are from that time, admitting modern equivalents. The response ranges is from 20 to 20 000 Hz.
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...