This gun-like sound effects circuit is based on the PLL4066. The circuit was found in the December 1989 issue of Radio Electronics magazine and already includes a small amplification stage.
This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and...
We found this circuit in the October 1992 Radio Electronics magazine. The frequency is given by C1...
Although most common piezoelectric transducers have a reduction in performance at frequencies...