More about LED (792)

1-11-2002 | You would be forgiven for thinking that a torch is probably the ultimate minimalist circuit: all you need is a battery, switch and bulb and...

1-10-2002 | A digital alarm clock which decodes and synchronises itself to the time signal picked up from the Rugby ‘MSF’ transmitter on 60 kHz.This is...

1-07-2002 | If you need to drive a number of white LEDs to provide display backlighting or for a white-light torch what’s the best way to configure them...

1-07-2002 | In many small battery powered apparatus it is common to have an LED act as a combined indicator for ‘power-on’ and ‘battery state’. The most...

1-07-2002 | Most of the analogue audio media, including radio broadcasting, stick within 60 dB dynamic boundaries. This VU Meter was designed to be used...

1-07-2002 | The general assumption is that white LEDs operate at a voltage of 3.6 V and a current of 20 mA, which is about right. Lithium Ion cells coin...

1-07-2002 | A universal voltage tester should respond to both dc and ac voltages. The usual types with glow-discharge lamps only work with voltages grea...

1-06-2002 | White light LEDs have been a long time in the making. This design (as part of our Mini Project series) employs a simple circuit to make the...

1-12-2001 | Thanks to their high light output and long lifetimes, a white LED is an excellent choice as a replacement for the incandescent bulb in a pen...

1-12-2001 | A flashing LED based on a 555 is not likely to win the first prize for originality, but such a circuit continues to be useful for all kinds...