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Light Dimmer Circuits
Light Dimmer Circuits:  # - C     D - K     L - R     S - Z

Last Updated on: Sunday, August 23, 2015 03:14 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

C implements pushbutton light dimmer -  06/18/98 EDN Design Idea   (Several design ideas on this page, scroll to find this one)  Four ICs--a multiplier, a sync separator, an op amp, and a dc-restore IC--along with a handful of passive components can implement a complete AGC and dc-restore circuit for video signals (Figure 1). . .  [by William Grill, Riverhead Systems, Littleton, CO]  

1.5 Hour Lamp Fader (Sunset Lamp) -  The sunset lamp comes on at full brightness and then slowly fades out over 1.5hours time and stays off until power is recycled. . . .  [Design by Bill Bowden]

12 Volt Lamp Dimmer (using a pot) -  Here is a 12 volt / 2 amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a astable 555 timer oscillator. When the wiper of the potentiometer is at the uppermost position, the capacitor will charge quickly through both 1K resistor. . .  [Bill Bowden's website]

12 Volt Lamp Fader (LEDs or incandescent) -  This circuit is similar to the "Fading Red Eyes" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss. The switching waveform is generated by comparing two linear ramps . . .  [Bill Bowden's website]

120 VAC Lamp Dimmer -  The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes provide a full wave rectified voltage to the anode of a SCR. Two small signal transistors are connected in a switch configuration so that when the voltage on the 2. 2uF. . .  [Bill Bowden]

120 Volt AC Lamp Dimmer Full Wave SCR -  The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes provide a full wave rectified voltage to the anode of a SCR. Two small signal transistors are connected in a switch configuration so that when the voltage on the 2. 2uF capacitor reaches about 8 volts, the transistors will switch on and discharge the capacitor through the SCR gate causing it to begin conducting. The time delay from the beginning of each half cycle to the point where the SCR switches on is controlled by the 50K resistor which adjusts the time required for the 2uF capacitor to charge to 8 volts. As the resistance is reduced, the time is reduced and the SCR will conduct earlier during each half cycle which applies a greater average voltage across the load. With the resistance set to minimum the SCR will trigger when the voltage rises to about 40 volts or 15 degrees into the cycle. . . .  [Bill Bowden]

12v Light Dimmer V2 -  This version controls lights, LEDs and even motors with only 10 components - up to 50W. . .  [by P. Townshend - EduTek Ltd]

12V PWM Motor/Light Controller -  The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET. N Channel devices tend to handle more current than P Channel devices, they are also less expensive. The high side version of the circuit is useful when one side of the load has to be grounded. . .  [G. Forrest Cook]

14 Volt Lamp Dimmer (using a pot) -  Here is a 12 volt / 2 amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a astable 555 timer oscillator. When the wiper of the potentiometer is at the uppermost position, the capacitor will charge quickly through both 1K resistor. . .  [Bill Bowden's website]

14 Volt Lamp Fader (LEDs or incandescent) -  This circuit is similar to the "Fading Red Eyes" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss. The switching waveform is generated by comparing two linear ramps . . .  [Bill Bowden's website]

2 Wire DC Lamp Dimmer replaces Rheostats -  10/23/97 EDN Design Idea   Originally for use in commercial trucks, a low-cost dc lamp dimmer (Figure 1) can control more than 100W of incandescent panel lighting and replaces a high-power rheostat, whose heating darkens instrument panel. . .  [by Kevan O'Meara, KO Systems, Chatsworth, CA]

230 Volt Dimmer -  Find out how to put together a simple but efficient PWM dimmer circuit for LEDs. . . .  [REUK-Renewable Energy UK website]

2-wire DC Lamp Dimmer replaces Rheostats -  10/23/97 EDN Design Idea   Originally for use in commercial trucks, a low-cost dc lamp dimmer (Figure 1) can control more than 100W of incandescent panel lighting and replaces a high-power rheostat, whose heating darkens instrument panel. . .  [by Kevan O'Meara, KO Systems, Chatsworth, CA]

5 Channel Dimmer Rack -  Note: This document describes my light dimmer project I have made. This document is not ment to be a full construction project and it might lack some details. The document is designed as an example those who might think to design and build their own dimmer circuit. If you are plannign to take such project then I must warn you that you must know quite a bit of safetu issues before even thinking of building this kind of device which is connected directly to mains and controls lots of power (mistakes might mean electrical safety and fire safety dangers). . . .  [Copyright Tomi Engdahl 1998,1999,2000]

A Ballast that can Be Dimmed from a Domestic Phase Cut Dimmer. -  A system has now been developed, based aroundIR2156, whereballast is able to operate with minimal flicker over a considerable portion ofadjustment range of a dimmer andlight output may be controlled over this range from maximum output down to around 10%. . . . 

ABR-42021/ Control Interface for Standard 0-10VDC Dimmers -  Fairchild App Note - . . . 

Addressable DALI Dimming Ballast -  A digitally addressable digital dimming ballast has been developed. It conforms to DALI standard requiring very few parts and operates at very low power. Applications include building management or studio lighting where it is desired to control single or groups of lamps for conserving energy, performing lamp maintenance or creating prefect light quality. The design includes the digital dimming ballast, the code of the micro-controller and a platform to control the ballast by PC. . . .  [Authors are Cecilia Contenti and Tom Ribarich Applications Engineer, International Rectifier, Lighting Group]

AN809: Digitally Addressable DALI Dimming Ballast App. -  Application Note Published 10-Apr-02. . .  [Microchip]

Ballast that can Be Dimmed from a Domestic Phase Cut Dimmer. -  A system has now been developed, based aroundIR2156, whereballast is able to operate with minimal flicker over a considerable portion ofadjustment range of a dimmer andlight output may be controlled over this range from maximum output down to around 10%. . . . 

Basic Circuit optimizes PhotoTransistor Bandwidth -  04/09/98 EDN Design Idea   (File contains multiple circuits. Scroll to find this one)A simple circuit can improve the dynamic performance of a phototransistor for use in low- to medium-speed applications as fast as 100 kbps, such as optical isolation of. . .  [by David Magliocco, CDPI, Scientrier, France]

Control Interface for Standard 0-10VDC Dimmers/ ABR-42021 -  Fairchild App Note - . . . 


Light Dimmer Circuits:  # - C     D - K     L - R     S - Z


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