This circuit with different colored indicator LEDs has an expanded scale. We found it in the March 1992 Radio Electronics magazine. For an adjustable range of 0 to 10.5 V.
This circuit is used to connect an additional capacitor to a tuned circuit of a VFO. The circuit...
This simple oscillator with diac and PUT was found in documentation from the 80's. The circuit...
We found this sophisticated meter circuit in an article in Radio Electronics magazine from June...