Monday, April 2, 2018

Ceiling Fan Regulator or Incandescent Lamp Dimmer Circuit

Good Evening.
Let's look at a Ceiling Fan regulator or an Incandescent lamp dimmer circuit and see how we can make one by ourself.

Components Required:


1 500KΩ Variable
1 4.7KΩ


1 0.1µF 100V Ceramic.


1 DB3


1 MAC97A8


This circuit will be in series with the load that needs to be controlled.

Working Principle:

In terms of how this circuit works, it is pretty complex so I'm not gonna go into much details here but I will talk about those components and how they work in some other post. These components are a TRIAC and a DIAC. To explain the circuit simply what it does is change the normal sine wave that we get from main line in order to provide less power to the appliance thus dimming the lamp or slowing down the ceiling fan. However as it distorts the sine wave many appliance like LED lamps won't work with this type of Dimmer. 0.1µF capacitor is used for triggering which first charges via the Variable Resistor. Higher resistance means more time will be required to charge up the capacitor.


1. This circuit runs on 220V AC main line. To avoid electric shock do not touch any part of it during operation.
2. To modify any part of the circuit make sure to disconnect it completely from main line.


1. Datasheet bank.
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