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 General Electric circuit is from the 80's. The PUTs used in this meter are not common...
The DC output of this circuit corresponds to the RMS value of the input voltage. The circuit is...
This circuit with different colored indicator LEDs has an expanded scale. We found it in the March...