This circuit that uses potentiometer tuning, was found in a documentation from the 80's. The integrated circuit used is from that time and is a not common today.
Of course, with a change in the cable length, the frequency can be changed as long as it is within...
This VCO with the 4046 PLL generates signals from 0 to 1.5 kHz. The circuit is from a Radio...
The circuit was found in the February 1992 Radio Electronics magazine. The scale can be changed by...