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 was found in a 1967 Electronics World. The circuit uses components of the time that...
The SCR sector of this circuit can be powered by high voltage AC and instead of the LEDs we can...
This short-range experimental transmitter emits a signal with many harmonics, without modulation. It can...