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.
The BFO or Beat Frequency Oscillator is used to receive telegraphic signals or even modulated in...
Taking advantage of the comparator setting, we can use the Norton amplifier as an over temperature...
This circuit was found in an American documentation from 1975. The components of the time can no...