Lamp pulser circuit

admin August 27, 2008 No Comments
 Description. Here is a simple circuit that can be used to pulse an LED or a low power filament lamp. The effect is such that the LED lights up from OFF state gradually and then dims gradually. Such a circuit is very useful in decoration purposes. The circuit is nothing but a triangular wave generator based on dual opamp IC LM 358.The two opamps inside the IC is used for the purpose. The transistor Q1 BC337 is used to...
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Dancing light.

admin November 11, 2011 72 Comments
Description. Here is a simple dancing light circuit based on NE555 (IC1) & CD4017 (IC2) . The IC1 is wired as an astable multivibrator to provide the clock pulses for the CD4017. For each clock pulse receiving at the clock input (pin14) of IC CD4017, the outputs Q0 to Q9 (refer pin diagram of CD 4017) becomes high one by one alternatively. The LEDs connected to these pins glow in the same fashion to give a dancing effect. The...
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Lamp flasher circuit

admin April 7, 2010 6 Comments
Description. This simple circuit that can be used to flash incandescent lamps up to 10W power rating.The circuit is ideal for making flashing beacons on automobiles and other applications like that.The circuit is nothing but  an astable multi vibrator based on Q1&Q2 ( BC557&BD139).The capacitor C1 is the main timing element which determines the flashing rate of the circuit.The switch S1 can be used as an ON/OFF switch. Circuit diagram with Parts list. Notes.  Power the circuit from a...
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12 V Florescent lamp driver circuit

admin April 7, 2010 8 Comments
Description. Here is a simple and effective circuit for driving florescent lamps from a 12 V supply.The circuit is nothing but consists of an oscillator, a MOSFET switch and a step-up transformer for driving the florescent lamp. The IC1 TLC 555 is wired as an astable multivibrator for producing the necessary oscillations.The MOSFET Q1 is used to amplify the oscillations produced by the IC1.The out put of MOSFET is connected to the primary of the step up transformer to...
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Micro Flasher

admin May 29, 2008 4 Comments
Description. This micro flasher circuit continuously emits flashing light with the consumption of very less power.The circuit can run for a very long time for four 1.5 V torch cells.   Here a low power CMOS IC CD4093 (IC1) is used to produce sharp pulses  of 20 ms from a red LED.The LED appears to be glowing continuously due to persistence of vision ,and lot of power is saved.The IC1 is quad NAND gate whose one gate is used...
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Mini Flasher

admin May 14, 2008 No Comments
Description. Here is a simple and compact flasher circuit that an be used where ever a flashing LED is needed.The circuit finds application in flashing beacons,alarms automobile and more. The circuit is nothing but an astable multivibrator based on IC NE 555 (IC1).The frequency of the oscillation depends on the values of R1,R2 ,R3 and C2.The LED glows when the out put  (pin3)  of IC1 goes high.The  IC1 NE 555 can easily drive a LED.The resistor R4 acts as...
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8W Flouroscent lamp driver.

admin May 7, 2008 4 Comments
Description. Here is the schematic of a simple flouroscent lamp driver circuit based on two transistors.The circuit uses capacitive ballasting for driving the tube.An 8 W  standard flouroscent tube can be efficiently driven using the circuit. The two  transistors (2Sc 1983)  with associated components forms a oscillator  around 1KHz.The oscillator is wired so that  saturation condition of the transistors are  prohibited.This  adds on to the efficiency of the circuit.The circuit produces a clean sine wave with very less noise....
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Street light circuit.

admin March 8, 2012 219 Comments
Description. The circuit diagram present here is that of a street light that automatically switches ON when the night falls and turns OFF when the sun rises. In fact you can this circuit for implementing any type of automatic night light. The circuit uses a Light Dependent Resistor (LDR) to sense the light .When there is light the resistance of LDR will be low. So the voltage drop across POT R2 will be high.This keeps the transistor Q1 ON....
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Air craft warning light circuit

admin February 16, 2012 5 Comments
Introduction. Here is low cost circuit that can be used for implementing a warning light on the top of tall structures as a warning for low flying aircrafts. Usually such lights are just stay glow type. Here our light is a flashing type, and surely this will draw more attention and of course add more safety. When the AC mains is switched on the bulb will get supply and it will glow. When the bulb glows the LDR adjacent...
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Modified lamp dimmer circuit

admin January 24, 2012 18 Comments
Description. This is a modification of the circuit Simple Lamp Dimmer/Fan Regulator  previously  posted here. The working of the circuit is same as that of the previous, but in addition a snubber circuit consisting of resistor R4 and capacitor C3  is included to improve the performance of the triac T1. A fuse is also included for better safety. I think this is the better circuit to try . Circuit diagram with Parts list . Notes. No matter how  what...
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