Simple Lamp Dimmer/ Fan Regulator
A Lamp Dimmer/Fan Regulator Circuit
We have modified this circuit: – Take a look – Modified Lamp Dimmer
Description .
This is the circuit diagram of the simplest lamp dimmer or fan regulator.The circuit is based on the principle of power control using a Triac.The circuit works by varying the firing angle of the Triac . Resistors R1 ,R2 and capacitor C2 are associated with this. The firing angle can be varied by varying the value of any of these components. Here R1 is selected as the variable element . By varying the value of R1 the firing angle of Triac changes (in simple words, how much time should Triac conduct) changes. This directly varies the load power, since load is driven by Triac. The firing pulses are given to the gate of Triac T1 using Diac D1.
Notes
Assemble the circuit on a good quality PCB or common board.The load whether lamp ,fan or any thing ,should be less than 200 Watts. To connect higher loads replace the Triac BT 136 with a higher Watt capacity Triac . All parts of the circuit are active with potential shock hazard.So be careful.
I advice to test the circuit with a low voltage supply (say 12V or 24V AC) and a small load (a same volt bulb) ,before connecting the circuit to mains.
Parts List
R1 1o K 1 Watt Resistor
R2 1o0 K Potentiometer (Variable Resistance)
C1 0.1 uF (500V or above ) Polyester Capacitor
T1 BT 136 Triac
D1 DB2 Diac
Fan Regulator Circuit Diagram
BT 136Triac Necessary Data.
BT 136 Specifications
We have more Power Control circuits in our website that may interest you:
1. Temperature Controlled Fan Regulator
2. Simple DC Power Delay Circuit
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Hello sir please can u send me the total documentation of the temperature controlled fan using triac, diac, thermistor. Please send me totally as early as posiible. I will be waiting for your reply.
we are yet to try it.. hope it works !
Hi Nohammed Saad The same circuit can be used if it is mains operated LED appeared on Circuits today. If it is DC operated then you can use a variable current source using LM317 or MOSFET.
i would like to control a dc load like LED s what do you recommend for me??
Hi Tomin Thank you very much good useful circuit
This circuit diagram is very popular and useful. But I have another one with An optional 7-segment display with its associated circuitry has been provided to display your choice of fan speed.http://circuitsector.blogspot.com/2010/12/digital-fan-regulator-circuit.html
i want to design light dimmer circuit.lamp brightness will be controlled based on already existing brightness in room.give information about sensor i have to use.
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I m a 4th year student of EEE department and i m looking 4 project based on automatic temperature controlled circuit. So i choose automatic temperature controlled fan regulator. I need of details about this circuit………..
dear,
how to modify this “simple lamp dimmer/ fan regulator” circuit to dark controlled on off switch by using LDR
Here is the circuit you asked.
http://www.circuitstoday.com/pwm-motor-speed-controller
can any one provide efficient circuit diagram for dc fan regulator at 12v,5A .if so give me some website address
May i use any other number in the place of BT136?
This is sure way to have noise on your power lines in your home it will work but coils filtering make a real world circuit
Arie
i would like to make a scr controled dc regulated power supply,can u help me
I would like to connect higher load like 3000watt filament lamp,pls. recommend me the appropriate triac with proper circuit to avoid potential shock hazards.