The red LED provides visual indication of the current flowing through the resistor-zener-diode circuit. The higher the current, the brighter the LED will light. You can omit this LED if you don’t need ...

This is a simple blinking led circuit powered from 220V that can be used to mark special places or as voltage indicator. The voltage from the mains charges the capacitor through R1 resistor and D1 ...

If the diode being tested were open-circuit both LEDs on the unit would remain lit. A stable Multivibrator The trouble with describing the operation of an oscillator circuit is defining a suitable ...

Kids love building electric circuits, but connecting light bulbs to batteries with fiddly wires is tricky for young hands. Play dough and light-emitting diodes (LEDs) solve the problem beautifully.

The control circuit responds by increasing the PWM on-time to boost the output voltage higher in a failed attempt to increase the LED current. In most instances, the output voltage rapidly rises in an ...

All the diode-transitor logic circuits are built from discrete components; nary a chip was used, and to spice things up, [Gislain] used LEDs in place of regular diodes everywhere in the circuit.

It was red, a signature of gallium arsenide phosphide (GaAsP), the alloy Holonyak had layered into the diode. Now LEDs are straight-up replacing incandescent light bulbs. There's another great ...

LED output-open/-short, cycle-by-cycle overcurrent protection, sense-resistor and shorted-inductor/-diode detection, diode-open circuit, and thermal shutdown. The AL8866Q is available in the SO ...