Simple Threshold Switch For An LED Indicator Oct. 9, 2008 I needed a simple LED indicator showing that a particular voltage level had been reached—specifically, that a capacitor had charged to a ...

I have used Red and Green LED’s. When node A is positive green LED glows while when node B is positive, Red LED glows. This indicates polarity of the input d.c voltage . 2) LED as a Continuity tester: ...

[Henryk] just sent us his latest episode of simple LED circuit puzzles. In front of the camera he solders one pin of each of the 3 LEDs to a different switch. He then puts the three assemblies in h… ...

If you want to easily control the power in a circuit, you’ll probably reach for the classic toggle switch. While there’s certainly nothing wrong with that, physical toggles are a bit da… ...

Supertex has introduced an LED lighting chip with switch dimming. The IC, dubbed HV9801A, dims LED lamp brightness to one of four preset levels through rapid toggling of a light switch. Light levels ...

3. The demonstration circuit uses the switch to activate a simple LED; standard 1N4148 diodes are used as clamps to prevent high-voltage spikes from damaging the flip-flop IC.

Turning on the relay cuts the power supply to the end circuit, and red LED D 3 turns on, indicating a reverse voltage. The circuit consumes power only if reverse polarity is applied. Unlike FETs or ...

In production, this may be replaced with a zero Ohm resistor. The open circuit protection circuit shown utilizes R9, causing it to serve an additional function, in conjunction with Zener diode D2. In ...