AC lights dimmer using triac

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  Posted by momename - August 2, 2014 at 5:10 am

This circuit has can to turn down a light bulb arrives at 100W. If Triac there is tall temperature should hold Heat Sink or let off the heat. The Diac be diode that perform be formed encourage or Trigger Diode 2 kinds are way or Bidirectional. The VR1 use for fine decorate turning down fire. Caution this circuit must is in a box closes all the time that have the electricity flows through.

In figure 2 well than the first circuit
Operation of the circuit be Lamp L1 is adjusted by adjusting the light of VR1. This will serve to control the speed of charging of C1, Because triac will work.
When C1 has charged to the voltage at the triac work.When adjusting the VR1 C1 will charge as little faster lamp is lit.If the adjustment of VR1 C1 will charge very slowly.The little light bulb. Because the triac does not work over the triac during the work.The light bulb will dim down by adjusting VR1.The R1 is placed for protection VR1 prevent damage.The R2, C2 is used to eliminate signal disturbance. Both produced and external circuit.
AC lights dimmer with triac


1200 Watt AC Dimmer by Triac Q4006LT

This is Power AC Dimmer 1200 watt size. It is use a triac Q4006LT. Friends ever tour is the foreign land has and to ever reach rest a hotel. On bed head has will head bed fire decorates. It has a button opens-close and a button controls the brightness with the equipment this/these be AC Dimmer follow our circuit can fine to decorate.

1200 Watt AC Dimmer by Triac Q4006LT

The VR1 for control the light besides when friends apply TRUE work. The Q1 -Q4006LT , should hold heat sink with and should be careful specially prohibit catch one ( part ) which part in the circuit , because read will bump against the electricity can suck. I hopes this circuit , friends can induce apply be AC Dimmer with electric other appliances bump against emphasize kind coil heat equipment , be lucky please yes.

pcb-layout-of-1200-watt-ac-dimmer-by-triac-q4006lt
Figure 2 the pcb layout and Components layout of this circuit.

Note: Fuse you should as current load. for example we use 100Watt lamp we will use fuse current is 100 watt / 220V = 0.45A or 0.5A.

gerson says about: 1200 Watt AC Dimmer by Triac Q4006LT
How can this be a 1200W dimmer when it uses a 0.5A fuse? If anything it should be 5A fuse no?

Sounds more like a 120W dimmer by the maths.

Let’s justified with calculation:

Power (apparent since AC) = VI(rms) = 220Vac x 0.5A = 110VA (max, due to limitation of fuse)

Let’s assume a power factor of 1 (not possible in real life, unless 3 phrase)

Power_in (max) = 110W.
Power_in (let’s said pf=0.7, realistic case) = 110 x 0.7 = 77W, this is more realistic power input.

So if power input is only about 77W, please tell me how it could output 1200W? It’s impossible according to law of conservation of energy. The fuse will just BLOW every time it switches on at full brightness.

To get 1200W input for typical realistic case, you need
fuse rating (Irms) = Pr / (V * pf) =
= 1200 / (220 * 0.7) = 6.5A

Sure you may not need that many current since it is a dimmer, but at maximum brightness you need 6.5A otherwise i’m sure something will blow (the fuse).


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