The AC light dimmer circuit can control light bulb or speed AC motor, we use triac and SCR as main,and adjust potentiometer and switch,more projects circuits below:
AC Dimmer for Lamp 6.3V
[Deleted, please visit the original source using the link down below ]
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AC 100W lights dimmer using a triac
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In figure 2 well than the first circuit
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1200 Watt AC Dimmer by Triac Q4006LT
This is Power AC Dimmer 1200 watt size. It is [sic] use a triac Q4006LT. …
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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).
Original source >> Dimmer circuit.