LED Flasher
The idea behind this economical ?ashing LED indicator is very simple: it uses a very low frequency oscillator to drive two LEDs. As can be seen in the cir.....
LED Bike Light Circuit Project
First I bought another front wheel, one which has a dynamo already built in the hub. This supplied a nice sine wave of 30 Vpp (at no load). With this knowledge ...
High-intensity LED Warning Flasher
This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subj.....
Halogen Lamp Dimmer With Soft Start
Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplat.....
Flickering Light II
Regardless of whether you want to effectively imitate a house fire, a campfire, or light from welding, the circuit described here fills the bill without u.....
fan ballast control
Using the FAN7710 Ballast Control IC for Compact Fluorescent Lamps developed using Fairchild s unique highvoltage process and system-in-package (SiP) conc.....
Fading LedsCircuit
This circuit operates two LED strips in pulsing mode, i. e. one LED strip goes from off state, lights up gradually, then dims gradually, etc. while the other LE...
Economical Desk Lamp For Camping
This LED lamp was originally designed for use on a budget solar-charged 12V electrical system. It is bright enough for comfortable reading at night and fe.....
Dimmer With A MOSFET
This circuit shows that dimmers intended for use at mains voltage do not always have to contain a triac. Here, a MOSFET (BUZ41A, 500 V/4.5A) in a diode br.....
Dark Activated Terrace Lamp
Compact circuit, Can be wired in parallel to existing switches This device allows one or more lamps to illuminate at sunset and turn off at dawn.Q1 and Q2.....
Dancing LEDsCircuit
LED sequencer: follows the rhythm of music or speech, 9V Battery-operated portable unit The basic circuit illuminates up to ten LEDs in sequence, followin.....
Contrast Control for LCDs
The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant....
Circuit Project: A Handy Pen Torch
This easy to construct “Handy pen torch†electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4.8V dc) supp...
Bluish Flasher
Firstly, it demonstrates how the combination of a blue and a white LED can be used to give a realistic imitation of a camera flashlight. Secondly, the goo.....
Bicycle Back Safety Light Circuit Schematic
This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low vo...
Automobile White LED Light
Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficient white LED modules using the battery power available in...
A Very Simple LED Tester
This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type ...
6-Channel Running Light
The circuit of the running light comprises two integrated circuits (ICs), a resistor, a capacitor and seven light-emitting diodes (LEDs), Decade scaler IC.....
30mA LED Dimmer
If you`ve ever tried dimming a LED with a simple potentiometer, you know that the approach does not work very well. Just as with ordinary diodes, the voltage-cu...
1W LED Driver
This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward v.....