LED driver circuit diagrams

AC Line powered LEDs
January 16, 2011

The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current. Since the capacitor must... [more]

Line Powered White LEDs
December 29, 2010

The LED circuit below is an example of using 25 white LEDs in series connected to the 120VAC line. It can be modified for more or less LEDs by adjusting the resistor value. The exact... [more]

Remote Doorbell Warning Switch
November 26, 2010

This circuit should only be used with the solenoid type chime doorbells, the electronic type that play tunes will not work here. [more]

LED Torch
October 27, 2010

A common problem with small torches is the short life-span both of the batteries and the bulb. The average incandescent torch, for instance, consumes around 2 Watts. The LED Torch in Fig. 1 consumes just... [more]

Automatic Low-Power Emergancy Light
October 3, 2010

Here is a white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fails, and turns off when... [more]

circuit from:http://www.extremecircuits.net/2010/01/automatic-low-power-emergancy-light.html

Mains Operated LED Circuit Schematic
October 2, 2010

Here is a simple and powerful LED circuit that can be operated directly from the AC 100 volt to AC 230 Volts mains supply. The circuit can be used as mains power locator or night... [more]

circuit from:http://www.extremecircuits.net/2009/09/mains-operated-led-circuit-schematic.html

Multicolor HD LED
October 2, 2010

Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if... [more]

circuit from:http://www.extremecircuits.net/2010/05/multicolor-hd-led.html

Solar Lamp Using PR4403
October 2, 2010

The PR4403 is an enhanced cousin of the PR4402 40mA LED driver. It has an extra input called LS which can be taken low to turn the LED on. This makes it very easy to... [more]

circuit from:http://www.extremecircuits.net/2010/05/solar-lamp-using-pr4403.html

Two-Led Pilot Light
October 2, 2010

This circuit is designed on request and can be useful to those whishing to have, say, a red LED illuminated when an appliance is on and a green LED illuminated when the same appliance is... [more]

Ultra Bright LED Lamp
October 2, 2010

This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost Rs 8 to 15.... [more]

circuit from:http://www.extremecircuits.net/2010/05/ultra-bright-led-lamp.html