The Itsy-Bitsy USB Lamp

It plugs into the USB port and is just the shot for checking motherboard switch and jumper settings. Many readers will remember a commercial product of a.....

stroboscope uses white leds

This stroboscope circuit uses 16 high-brightness white LEDs in a torch housing and it provides a signal output to a frequency counter to provide a rev cou.....

Sound-Activated Lamp (Relay Switch)

This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (s.....

Solar Lamp Using PR4403

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 v.....

Smooth FlasherCircuit

Ordinary LED flashers turn the LED on and off abruptly, which can get a little irritating after a while. The circuit shown here is more gentle on the eyes.....

Simple Emergency Light

This is an automatic emergency lamp with day light sensing, means it senses darkness/night and turns ON automatically. Similarly it senses day light and turns O...

Rear Light After Glow (For Bicycles)

This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter th.....

Portable Solar Lantern

This portable solar lantern circuit uses 6 volt/5 watt solar panels are now widely available. With the help of such a photo-voltaic panel we can construct.....

Novel White LED Torch

Although this design is reproduced directly from the manufacturer s datasheets, its use in this application is rather novel. Originally intended for high-.....

Multicolor HD LED

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, thi...

Model Theatre Lighting Dimmer

This circuit is the basis for the dimmers in a model theatre lighting system which uses touch globes as the light source. The circuit is based around a 55.....

Mains Powered White LED Lamp

Did it ever occur to you that an array of white LEDs can be used as a small lamp for the living room? If not, read on. LED lamps are available ready-made,.....

Mains Operated LED Circuit Schematic

Small in size! Big in use 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 c.....

Luxury Car Interior Light Dimmer

This circuit is much more modest, but certainly still worth the effort. It provides a high quality interior light delay. This is a feature that is include.....

LED Torch Uses Blocking Oscillator

This simple LED torch is driven by a 2-transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limit.....

LED TesterCircuit

Before you use LEDs, it`s a good idea to check them out. With a LED tester, you can even do it in the dark! LEDs are available nowadays in all shapes and colors...

LED Phototherapy Unit

Common to all the devices is that they emit intense red light with a wavelength of 660 nm. Some biophysicists claim that light of this wavelength can have a pos...

Led or Lamp Flasher Circuit

Ideal to operate 3 to 24V DC existing on-circuit lamps This circuit was designed to provide that continuous light lamps already wired into a circuit, beco.....

LED Lighting For Consumer Unit Cupboard

The consumer unit (or electricity meter`) cupboard in some older houses is a badly lit place. If the bell transformer is also located in this cupboard, it may b...

LED Light Pen

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