Ac Dimmer Circuit | Electronic Project Circuits

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Very cheap ac light dimmer

You may had saw to a complicated AC light dimmer circuit ago. Now let’s look simple, but useful, fairly good.
This circuit uses a capacitor in series with one lamp and accessories with a bit more. Is used to control the light dimmer, Easy and cheap. Power was reduced,without interference, the switch S2 is an option to output size to full size or less.
The value of the capacitor C1 depends on the size and power of the lamp brightness as required. (see table below) may be used several switches, to select the capacity of different time.
Do not use the electrolyte capacitor in this circuit,And if a short circuit could cause the C1 capacitor and should be used polyether or paper types and size at least 300 volts.
Testing should be aware of the charges accumulated by the capacitor.

Be the first to comment - What do you think? Posted by admin - April 18, 2011 at 9:30 am

Categories: Basic electronics, Dimmer, Electronic Control Tags: ac dimmer circuit, light dimmer control

Dimmer With A MOSFET BUZ41A

This circuit shows that dimmers intended for use at mains voltage do not always have to contain a triac. Here, a MOSFET (BUZ41A, 500 V/4.5A) in a diode bridge is used to control the voltage across an incandescent bulb with pulse-width modulation (PWM). A useful PWM controller can be found elsewhere in this issue. The power supply voltage for driving the gate is supplied by the voltage across the MOSFET. D6, R5 and C2 form a rectifier. R5 limits the current pulses through D6 to about 1.5 A (as a consequence it is no longer a pure peak rectifier). The voltage across C2 is regulated to a maximum value of 10 V by R3, R4, C1 and D1. An optocoupler and resistor (R2) are used for driving the gate.

R1 is intended as protection for the LED in the optocoupler. R1 also functions as a normal current limiting device so that a ‘hard’ voltage can be applied safely. The optocoupler is anold acquaintance, the CNY65, which provides class-II isolation. This ensures the safety of the regulator. The transistor in the optocoupler is connected to the positive power supply so that T1 can be brought into conduction as quickly as possible. In order to reduce switching spikes as a consequence of parasitic inductance, the value of R2 has been selected to be not too low: 22 k? is a compromise between inductive voltages and switching loss when going into and out of conduction.
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Author: Ton Giesberts – Copyright: Elektor Electronics
Source: http://www.extremecircuits.net/

Be the first to comment - What do you think? Posted by admin - August 23, 2010 at 9:46 pm

Categories: Electronic Control Tags: ac dimmer circuit, power mosfet control

Light AC Dimmer 120Watt

This is Light AC Dimmer 120Watt circuit. It can use turn down a light bulb get to 120Watt. By fine decorate the brightness of a light bulb that at , VR1 , while , be usable , Triac hot then should hold Heat sink that have large-sized. May choose 10A 400V sizes all right.