Tag Archives: light

Soft Start For Torch – Increases The Life Of Torch Bulbs

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The halogen or krypton bulbs in modern torches (USA and Canada: flashlights) have a limited life and are not particularly cheap. A simple modification in the torch lengthens the life appreciably. It is a fact of nature that any incandescent bulb has a finite life. However, the bulbs in modern… Read more »

IR Light Dimmer v.1

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This is a device for adjusting lights in your home with any type of remote controller (tv, dvd, video,…). Today we are using many devices in our homes to improve quality of our life and this is another example on how you can enhance a simple procedure like switching the… Read more »

Sun-Up Alarm

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The Sun-Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light beam, headlights etc. The circuit works as follows…. Read more »

Light/Dark Detector Circuit

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This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light. Circuit diagram Parts: R1 100K Pot Q1 2N3904 NPN Transistor or 2N2222 Q2 NPN Phototransistor RELAY 9V… Read more »

Strobe Light Circuit

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The way that this circuit works is as follows. The AC line voltage is rectified by D1 and D2 which connects to a voltage doubler circuit made up of the two 22uf capacitors. The Flash Freq. Pot and the 10uf capacitor charge up which triggers the Diac and causes the… Read more »

Light Sensitive alarm

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The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery running flat. Normal lighting can be used,… Read more »

Nite Rider Lights Circuit

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Circuit diagram The circuit is drawn with PCB 123 which you can download for free from http://www.pcb123.com As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the motorists eye. So looking around at my… Read more »

TRIAC Light Dimmer Circuit

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This little circuit can be used to dim lights up to about 350 watts. It uses a simple, standard TRIAC circuit that, in my expirience, generates very little heat. Please note that this circuit cannot be used with fluorescent lights. Circuit diagram Parts R1 50K Pot R2 15K 1/2W Resistor… Read more »