This circuit is from the manual of the integrated circuit used. Similar versions appear on this website and even in this section.
This gun-like sound effects circuit is based on the PLL4066. The circuit was found in the December...
The output current of this circuit reaches 12 mA. The zener diode determines the output voltage. The...
The circuit shown in the figure can serve as a basis for frequency meters, clocks. Stopwatches and many other...