This circuit was found in a March 1988 Radio Electronics. The voltage scale is set at R3. 19 LEDs are used in this indicator circuit.
This circuit uses a LM3900 Norton amplifier and a 2.7 V zener diode to supply a current of 1 mA to...
A 0 V signal initiates sampling on this circuit suggested by documentation from the 1970s. The...
This circuit is from an American publication of 1977. The tunnel diode admits equivalents and the...