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slave flash trigger – Circuit Schematic
slave flash trigger
The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually no...
Rear Light After Glow (For Bicycles) – Circuit Schematic
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 than in ...
Put That Light Out – Circuit Schematic
Put That Light Out
If you forget to switch off the light after leaving a seldom used room (such as the loft), there`s a strong likelihood that it could remain lit for months, runn...
Novel White LED Torch – Circuit Schematic
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-visibi...
Multicolor HD LED – Circuit Schematic
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...
Multi-Colour LED – Circuit Schematic
Multi-Colour LED
How many different conditions do you reckon may be signalled with just one LED Two, maybe three Using this simple circuit, a lot more! Admittedly, a two-colour ...
Model Theatre Lighting Dimmer – Circuit Schematic
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 555 time...
LED Torch Uses Blocking Oscillator – Circuit Schematic
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 limiting o...
LED TesterCircuit – Circuit Schematic
LED TesterCircuit
You have to admit that these tiny electronic lamps are handy, and they last almost forever. Around 40 years after Nick Holanyak developed the first LED, they ha...
LED Phototherapy Unit – Circuit Schematic
LED Phototherapy Unit
It is widely thought that light can be therapeutic for the human skin and soul. Light at the correct wavelength may also be effective against depression and all...
LED Light Pen – Circuit Schematic
LED Light Pen
Physicians and repair engineers often use small light pens for visual examination Spurposes. Rugged and expensive as these pens may be, their weak point is the ...
LED Bar Off Indicator – Circuit Schematic
LED Bar Off Indicator
The simple indicator presented in this article may be combined, in principle, with any circuit that contains an LED bar display driven by a Type LM3914 IC. It e...
The Itsy-Bitsy USB Lamp – Circuit Schematic
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 few ye...
Interactive Toy Traffic Lights – Circuit Schematic
Interactive Toy Traffic Lights
This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to directly drive three coloured LEDs (red, green and amber). At swit...
IC Controlled Emergency Light With Charger Circuit – Circuit Schematic
IC Controlled Emergency Light With Charger Circuit
Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC co...
High-intensity LED Warning Flasher – Circuit Schematic
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 (subject to...
Halogen Lamp Dimmer With Soft Start – Circuit Schematic
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 faceplate cont...
Fully Automatic Emergency Light – Circuit Schematic
Fully Automatic Emergency Light
The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight without any fea...
Flickering Light II – Circuit Schematic
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 using a...
Exit Sign With Battery Protection – Circuit Schematic
Exit Sign With Battery Protection
This circuit substitutes two white Luxeon 1W Star LEDs for the inverter and fluorescent tube in a standard battery-backed illuminated exit sign, as used in comm...