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Lamp / Light Control Circuits
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Last Updated: December 01, 2017 05:54 AM

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Circuits Designed by Dave Johnson, P.E. :

Ten-LED Sequential Flasher using Low PowerA while back I posted a flasher circuit which flashed 10 LEDs sequentially.  That circuit was powered by four AA alkaline cells.  The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell. . . Circuit by David A. Johnson P.E.-April, 2011

Three Volt Universal LED FlasherThe circuit below will flash any LED color with fixed current pulses powered by a 3v battery.  It uses a charge pump approach, which routes a constant current pulse through the LED, regardless of the LED voltage requirement.  Using this approach, white and . . . Hobby Circuit designed by David Johnson P.E.-June, 2008

Three-Minute Closet LightI have a coat closet by my front door.  The thing is very dark at night and really needs some kind of illumination inside.  I could hire an electrician to install a light in the closet ceiling and then wire it to a toggle switch outside the door but that would cost me quite a bit of money. . . Circuit by David A. Johnson P.E.-December, 2011

Three-Volt Low Battery Voltage FlasherMany battery powered devices use two AA alkaline cells.  Often you will not know when it is time to replace the batteries until the device powered by them actually stops operating.  The hobby circuit below can be connected to a 3v battery, to give you some . . . Hobby Circuit designed by David Johnson P.E.-January, 1998

Three-Volt Powered Super Bright LED FlasherI have posted several kinds of LED flashers over the years.   This is yet one more flasher, designed to flash any high power LED of any color.  It hits the LED with a 25ms 250ma pulse once every 2 seconds.   This works out to an average current about 3ma.  It . . . Hobby Circuit designed by David Johnson P.E.-April, 2009

Touch Activated SwitchThis circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp.. . . Circuit by David A. Johnson P.E.-January, 2002

Transmitter for Line Powered Xenon FlashThis line powered xenon flash circuit drives a small camera type flash tube.  It has an optical isolator to allow the flash to be safely triggered from some remote device.  A flash rate of 2Hz is possible with the circuit . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Ultra Low Current 3v LED Flasher #5This circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from National Semiconductor and a super efficient green LED from King Bright.  The 3v powered circuit forms a classic pulse generator circuit, which drives the LED.  The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED current is only 100ua. . . Circuit by David A. Johnson P.E.-February, 2011

Universal Flasher using a Latching RelayLatching relays are nifty devices.  Most contain two separate coils.  When a voltage is applied to one coil the relay latches in one state and stays in that state until voltage is applied to the unlatch coil.  Since the latching and unlatching pulses only . . . Hobby Circuit designed by David Johnson P.E.-October, 2005

Universal LED FlasherThis low power LED flasher circuit draws about 100ua from any DC power supply ranging from 3 volts to 24 volts.  The 1.0Hz 10ms LED pulsed current is held to a constant 10ma. . . Circuit by David A. Johnson P.E.-July, 2006

Universal-3v-LED-FlasherThe circuit below will flash any LED color with fixed current pulses powered by a 3v battery.  It uses a charge pump approach, which routes a constant current pulse through the LED, regardless of the LED voltage requirement.  Using this approach, white and. . . Circuit by David A. Johnson P.E.-June, 2008

Up/Down Ramping Light Pushbutton ControlThere are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch.  The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM. . . Circuit by David A. Johnson P.E.-March, 2009

Version a of 1.5v LED FlasherTo squeeze even more energy from a alkaline battery cell, this circuit adds two transistors to a circuit similar to the above design to boost the efficiency.  A small 1.5 volt alkaline N cell should flash the LED for a full year.  It too uses a "charge pump" technique to provide a LED the needed voltage. . . Circuit by Dave Johnson P.E.-June, 2000

White LED Array that is Lined PoweredThere has been a lot of excitement lately in the lighting industry.  Some companies are beginning to manufacture general lighting fixtures, which replace incandescent and fluorescent lamps, using LED lights.  When proper heat management is designed . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

Wig/Wag LED FlasherThis simple circuit will flash two LEDs in an alternating fashion. . . Circuit by Dave Johnson P.E.-December, 2004

Wireless LED FlasherThere are times when you would like to flash a LED through a thick plastic case without wires.  The circuit below performs this feat.  It can be powered from a supply ranging from 3v to 6v.  It draws about 300ua of average current at 5v. . . Circuit by David A. Johnson P.E.-January, 2011

Xenon Lamp Flash Detector AmplifierThis circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp.  When connected to a flip/flop it can serve as an on on/off Controller. . . Circuit by David Johnson P.E.-December, 2004

Xenon Photoflash ControllerThis 9v battery powered circuit is designed for remote control flash needs.  A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged.  A neon lamp is included to indicate when the system is ready to flash. . . Circuit by David Johnson P.E.-June, 2000


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

TRIAC based lamp dimmer -  Schematic only, no circuit description __ Contact: IQ Technologies

TRIAC Dimmable 20W Offline LED Driver using the LT3799 -  This circuit shows a complete LED driver solution.  The LT3799 senses the output current from the primary side switch current waveform.  The IC regulates the output current by adjusting the peak switch current and the duty cycle through a novel feedback control.  Unlike other primary side sensing methods that need to know input power and output voltage information, this new scheme provides much better output current regulation since the accuracy is barely affected by transformer winding resistance, switch RDS  (ON) , output diode forward voltage drop and LED cable voltage drop__ Linear Technology/Analog Devices App Note, Jul 1, 2011

TRIAC Light Controller -  This project is intended for controlling mains powered disco lighting, although there are many other possible uses for controlling almost any mains appliance.  It will control five seperate channels at up to 3 Amp per channel.  This could be increased by designing another PCB with wider tracks than the PCB included with this design __ Designed by Matthew Hewson

 
TRIAC Light Dimmer -  This little circuit can be used to dim lights up to about 350 watts.  It uses a simple, standard TRIAC circuit that, in my expirience, generates very little heat.  Please note that this circuit cannot be used with fluorescent lights.   __ Designed by Aaron Cake

TRIAC Light Dimmer -  Schematic only, no circuit description __ Contact: IQ Technologies

TRIAC Light Dimmer -  This little circuit can be used to dim lights up to about350-Watts.  It uses a simple, standard TRIAC circuit that, in my experience, generates very little heat.  Please note that this circuit cannot be used with fluorescent lights __ Contact: IQ Technologies

TRIAC lighting & heating controller uses few parts -  09/02/04  EDN-Design Ideas The TRIAC lighting-control circuit in Figure 1 is small and inexpensive because load and housekeeping power come directly from the line voltage, thereby eliminating bulky, expensive supplies.  The CLZD010 closed-loop controller maint __ Circuit Design by David Caldwell, Flextek Electronics, Carlsbad, CA

Tricolor LEDs Create a Flashing Array -  24-Jun-10 EDN-Design Ideas You can build a matrix of RGB (red/green/blue) LEDs using a simple and inexpensive circuit comprising the control logic and driver circuit in Figure 1 and some LEDs (Figure 2) .  The center RGB LED is the first to come on, after which each sequential LED in the 8×8-LED matrix follows.  This process gives the appearance that the display is alive and moving outward.  This sequence repeats, producing a rainbow effect of colors __ Circuit Design by Jeff Tregre, www/BuildingUltimateModels/com, Dallas, TX

Trigger for Strobes -  This page contains some information on circuits which can be used for triggering stroboscopes from external circuits.  The circuit here are designed to be integrate to strboscope circuits so that they can triggered using external trigger pulse.  The standard trigger pulse used in professional stroboscope controllers is 3-10V pulse.  If you don't already have a suitable controller,  __ Designed by Tomi Engdahl

Trip the Light Fantastic with LED Gadget Freaks -  Here is a collection of the best LED gadgets that have made themselves home in Gadget Freak.  

Triple Stroboscope -  This circuit enables observation of movement between other stroboscopes.  Generation of rectangular signal is based on NE555.  This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.  NE555 works in multivibrator mode generating astable pulses of 2Hz to 20Hz.  The frequency is adjusted by potentiometer P1.  The control potentiometer P1 can be placed as far as 30 meters away, for suspension of stroboscope’s work from far away. __ Contact: IQ Technologies

Turn-signal System for Motorcycles -  This circuit is based on the CMOS IC from Motorola, the MC14049UB Hex Inverting Buffer.  Of course, the regular CD4049 can be used and is pin-for-pin compatible.  The 4049 is a 16-pin chip.  Maximum DC supply voltage should not exceed 18V.  The above diagram can replace your existing mechanical clicker.  The prototype worked excellently! __ Designed by Tony van Roon  VA3AVR

TV Light -  Switch you TV lamp while comfortably seated on you armchair, using your TV's remote control  (*) .  Of course, you can use the same circuit for a variety of other "comfortable" uses, like controllin a fan or the heating.  Those very versed in electronics DIY could apply it to very unusual devices, like telephones or answering machines.   __ Designed by Projects & Ideas from Nutchip.com

Twinkle Twinkle X’mas Star -  Christmas just would not be Christmas if you do not put a flashing star on your Christmas tree.  Here is the circuit of such a flashing star.Fig.1 shows the circuit...__ Electronics Projects for You

Two Transistor Flasher -  The basic two-transistor flasher shown below has found its way into dozens of applications due to its simplicity and versatility.  Applications have included such diverse circuits as a micropower low battery indicator, a lightning detector, a off-line.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Two Transistor LED Flasher -  This circuit will flash a bright red LED as an attention getting device or fake care alarm. __ Designed by Bill Bowden

Two Transistor LED Flasher -  This is a classic 2 transistor astable multivibrator.  Many other NPN small signal or switching transistors can be used, including 2N4401, PN2222 or 2N2222 using the circuit on the left.  The circuit can also be inverted using PNP transistors such as 2N3906, 2N4403, PN2907, or 2N2907 as shown to the right __ Designed by Bill's Electronics Reference Library

Two Transistor LED Flasher 1 -  Circuit Only __ Designed by Tony van Roon  VA3AVR

Two Transistor LED Flasher 2 -  This circuit will flash a super-bright LED  (5000+ mcd) .  Good for fake car alarm or other attention getting device.  Component values are not critical, try anything else first from your junkbox.  Obviously, the 470 ohm resistor  (R3) determines the LED's brightness and limits the current flow to about 20mA.390 ohm can also be used as a save value.  If you decide to go with a green or yellow led, which draw more current, you may want to replace the 470 ohm with an appropriate value.  Flash rate is determined by R2 and C1 __ Designed by Tony van Roon  VA3AVR

Two transistor lights LEDs -  04/09/09  EDN-Design Ideas A previous Design Ideasdescribes a circuit that uses an astable multivibrator to drive an LED    (Reference 1].  The circuit in Figure 1 uses a simpler alternative approach.  The circuit uses a 2N3904 NPN transistor and a 2N3906 PNP trans __ Circuit Design by Barry A Tigner, Michigan State University, East Lansing, MI

Two-wire DC Lamp Dimmer replaces Rheostats -  10/23/97 EDN-Design Ideas 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 darkensinstrument panel.   __ Circuit Design by Kevan O'Meara, KO Systems, Chatsworth, CA

Two-wire Lamp Flasher -  This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. __ Contact: Flavio Dellepiane, fladello @ tin.it

Typical 120 Volt AC Dimmer -  This is the type of common light dimmer widely available at hardware stores and home centers.  The circuit is a basic model for light dimmer for120V AC voltages.  This basic design can handle light bulbs at power range of around30W to few hundred watts  (depends on construction) .    __ Designed by Tomi Engdahl

Typical Strobe Light Trigger -  555 based Timing circuit which triggers a SCR which controls the trigger transformer __ Designed by Don Klipstein

Ultra Low Current 3v LED Flasher #5 -  This circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from National Semiconductor and a super efficient green LED from King Bright.  The 3v powered circuit forms a classic pulse generator circuit, which drives the LED.  The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED current is only 100ua. . . Circuit by David A. Johnson P.E.-February, 2011

Ultra-Bright LED Lamp -  This ultra-bright white LED lamp works on 230V AC with minimal power consumption.  It can be used to illuminate VU meters, SWR meters, etc.  Ultra-bright LEDs available in the market cost...__ Electronics Projects for You

Ultracapacitor powers bicycle light -  09/28/00 EDN-Design Ideas The circuit in Figure 1 represents a simple and inexpensive way to provide additional bicycling safety.  A conventional bicycle-generator lighting system works with the circuit to provide safety lighting for several minutes after the bicycle has stopped.  Energy storage uses an ultracapacitor rather than a battery to avoid the typical battery problems of limited life __ Circuit Design by Dennis Eichenberg, Parma Heights, OH

Universal Flasher -  LED flasher with the LM3909 IC and runs from1.5-Volt battery.   __ Designed by Tony van Roon  VA3AVR

Universal Flasher using a Latching Relay -  Latching relays are nifty devices.  Most contain two separate coils.  When a voltage is applied to one coil the relay latches in one state and stays in that state until voltage is applied to the unlatch coil.  Since the latching and unlatching pulses only . . . Hobby Circuit designed by David Johnson P.E.-October, 2005

Universal Input Linear Fluorescent Ballast using the Ir2166 -  The IR2166 Demo Board is a high efficiency, high power factor, fixed output electronic ballast designed for driving rapid start fluorescent lamp types.  The design contains an EMI filter, active power factor correction and a ballast control circuit using the IR2166.  

Universal LED Flasher -  This low power LED flasher circuit draws about 100ua from any DC power supply ranging from 3 volts to 24 volts.  The 1.0Hz 10ms LED pulsed current is held to a constant 10ma. . . Circuit by David A. Johnson P.E.-July, 2006

Universal-3v-LED-Flasher -  The circuit below will flash any LED color with fixed current pulses powered by a 3v battery.  It uses a charge pump approach, which routes a constant current pulse through the LED, regardless of the LED voltage requirement.  Using this approach, white and. . . Circuit by David A. Johnson P.E.-June, 2008

Up/Down Ramping Light Pushbutton Control -  There are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch.  The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM. . . Circuit by David A. Johnson P.E.-March, 2009

USB-Powered PC Lamp -  This white LED lamp lets you use your PC or laptop at night without disturbing others’ sleep.  It produces a soft white light just enough to see the keyboard in darkness...__ Electronics Projects for You

Use a CFL ballast to drive LEDs -  04/26/07  EDN-Design Ideas A CFL ballast can drive a string of as many as 64 LEDs __ Circuit Design by Christian Rausch, Unterhaching, Germany

Use Simple Circuit LED for near-IR light -  09/01/98 EDN-Design Ideas NOTE :  File has many circuits, scroll down.  You can successfully use LEDs as sources of near-infrared light.  However, when you need a source of light with precisely controlled power, a feedback loop is necessary to compensate for the temporal and thermal changes of the LED parameters.  Standard LED types come with neither these monitoring detectors nor an external monitoring photodiode to detect part of the emitted light and generate a feedback signal.  The situation calls for some mechanical fixture to mount the photodiode. __ Circuit Design by Lukasz Sliwczynski, Marcin Lipinski, Institute of Electronics, Krakow, Poland

Using a Light Dimmer IC for AC Motor Speed Control -  This circuit example uses LS7231 Light Dimmer IC__ LSI Computer Systems

UV LED Flashlight Driver -  The rapid development of LED technology is also reflected in the production of integrated drivers, often called LED Drivers.  The market is plentiful lots of different integrated circuits for this purpose.  There are circuits for generating serial or parallel cascades LED Step-Up and Step-Down Convertor, charge pumps.  But when you need them to realize any involvement, and usually encounter unexpected problems.  Many drivers LED  (LED Drivers) is designed for a specific range of consumer electronics and often lacks the characteristics required of us. __ Designed by © Pavel Janko

UV Light Box -  I have been making PCBs for quite a number of years but one om my material suppliers has recently changed the Photoresist spray ingredients and it can no-longer be used with "high-spectrum visible light.  This means I am now forced to have a UV-light box.  I therefore built mine and the moment it is a "lashup" fixed to the workbench with masking tape.  So please excuse me if I do not include a photograph __ Designed by Harry Lythall-SM0VPO

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Lamp Controls:   #'s - B       C - K       L - M       N - S       T-Z


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