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


Last Updated: October 24, 2017 05:16 PM


Hour Meter Circuits
 

Last Updated: October 24, 2017 05:16 PM

Circuits Designed by Dave Johnson, P.E. :

Capacitance Touch SwitchA single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid state switch thermals.  It also has an adjustable sensitivity, which can be set . . . Hobby Circuit designed by David Johnson P.E.-January, 2002

Classic Linear 5v Supply using 6.3VAC TransformerThere are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often . . . Hobby Circuit designed by David Johnson P.E.-October, 2010

Closet Light with Automatic 3-Minute TimeoutThe circuit below is powered by three 1.5v alkaline AA cells.  With a finger tap to the pushbutton trigger switch, a cluster of 6 wide angle white LEDs is turned on.  The lights remain on for about 3 minutes, then will turn off.  The circuit’s standby current is only a few microamps.  A set of fresh batteries should last at least 200 light applications.  The circuit uses a Schmitt trigger inverter and two transistors.  When the pushbutton switch S1 is pressed, the 10uF capacitor C1 is discharged. . . Circuit by David Johnson P.E.-November, 2010

CMOS IC Flashes LEDJudging from the numerous references I have received, this electronic circuit, hobby circuit seems to be rather popular.  Many published circuits which flash LEDs need 3 or more volts.  This electronic circuit uses only a single inexpensive C-MOS IC and . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Computer Controlled PWM CircuitThere are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often. . . Circuit by David A. Johnson P.E.-October, 2010

Controlled Up/Down Ramping LightThere 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 . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2009

Controller for a 9v Powered Xenon PhotoflashThis 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 . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Convert Solar Powered Light to FlasherThe circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash.  This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit.  The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David Johnson P.E.-March, 2010

Dark Activated 12v Power Supply SwitchUsing an inexpensive phototransistor, this circuit switches 12v to 24v power to a load, whenever the sun goes down . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Detect Short Xenon Lamp FlashesThis circuit uses a small 2.5mm square photo diode in conjunction with a 100mH coil to detect the short light flashes from a xenon lamp.  The coil makes the circuit immune to normal room lights.  Its 10mv sensitivity can detect light flashes from a range of over 100 feet. . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Detects Xenon Lamp FlashThis 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 . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2004

Drive a LED with an Intensity Ramping ModeThe circuit below was designed to drive a LED with an intensity ramping mode.  Two 555 timers generate two different triangle waveforms.  The upper device generates a 10KHz signal while the lower unit produces a 1Hz signal.  The two signals are fed to a . . . Hobby Circuit designed by David Johnson P.E.-December, 2007

Five-Watt Fluorescent Lamp Intensity ModulatorThe circuit was designed to experiment with using small fluorescent lamps as a broad pattern source of modulated light.  The circuit hits the small lamp with narrow 1us pulses at a rate of 10KHz.  Each pulse launches about 10 watts of visible light.  The lamp. . . Circuit by David Johnson P.E.-June, 2000

Flashing LED Advertising Badge #1I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

Flashing LED Power Indicator This circuit flashes a power indicator LED to keep the average current low. . . Circuit by Dave Johnson P.E.-June, 2000

Fluorescent Lamp Intensity ModulatorThis hobby circuit was designed to experiment with using small fluorescent lamps as a broad pattern source of modulated light.  This hobby circuit hits the small lamp with narrow 1us pulses at a rate of 10KHz.  Each pulse launches about 10 watts of visible light.  The lamp starting method is a bit crude but the circuit does work. . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Fluorescent Lamp Night Light Needs Only 1 WattIf you are tired of replacing small night light lamps, try this circuit.  The line powered circuit uses a long life cold cathode fluorescent lamp.  A simple charge pump technique runs the lamp without any transformer . . . Hobby Circuit designed by Dave Johnson P.E.-March, 1999

Freeze AlarmI chose an accurate thermistor from Keystone as the temperature sensor for this circuit.  This device has a very specific resistance at a particular temperature.  According to the data sheet for the thermistor, the device will have a resistance of 361K at zero degrees C, which is the freezing point of water.  The thermistor is wired into a simple bridge circuit, which uses 1% resistors.  The bridge is connected to a very low power voltage comparator.  The circuit forms a switch circuit, which changes state, when the resistance of the thermistor reaches a certain value.  At zero degrees C the voltage at the non-inverting input of the comparator exceedsCircuit Solution by David Johnson P.E.-May, 2006

High Intensity Line Powered LED FlasherThere are times when you would like to generate an intensely bright flash of light using electrical power from the AC line.  The circuit below can drive a one to three watt power LED with about 350ma of peak current.  Since the circuit drives the LED with. . . Circuit by David Johnson P.E.-December, 2008

High Power LED FlasherPower LEDs are becoming more popular these days.  The DC input power to these devices ranges from 1 watt to 5 watts.  Normal LEDs only receive about 0.05 watts.  At this higher power, these devices can emit a lot of light. . . Circuit by David Johnson P.E.-August, 2008

HO Model Train Lighthouse FlasherHO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

HO Train Lighthouse Flasher RevisitedHO train sets often have authentic looking scale model homes and buildings.    A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.    I designed a working circuit but I was never pleased with the results.    I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.  … [ . . . Hobby Circuit designed by Dave Johnson P.  E.  , May 2012] . . . Hobby Circuit designed by David Johnson P.E.-December, 2012

Incandescent Lamp Inrush Current LimiterThis circuit limits the large inrush current often associated with large incandescent lamps.  With the components shown the current is limited to 1 amp, but it could be scaled to any desired current. . . Circuit by David A. Johnson P.E.-July, 2006

Increased power for LED FlasherPower LEDs are becoming more popular these days.  The DC input power to these devices ranges from 1 watt to 5 watts.  Normal LEDs only receive about 0.05 watts.  At this higher power, these devices can emit a lot of light . . . Hobby Circuit designed by David A. Johnson P.E.-August, 2008

Inrush Current Limiter for a Incandescent Lamp This circuit limits the large inrush current often associated with large incandescent lamps.  With the components shown the current is limited to 1 amp, but it could be scaled to any desired current . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006


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

Four Channel CAR Color Organ -  Back in the 1970's these were popular for use in homes and the colored bulbs were typically place in a box with a sheet of "rippled/bubbled" Plastic in front to break up the light patterns.  Some units gave very impressive light patterns.   __ Designed by G.L. Chemelec

Four 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) .   __ Designed by Tomi Engdahl

Four Channel HOME Color Organ -  FOUR Channels.  All Channels are Active Band Pass Filters.   __ Designed by G.L. Chemelec

Four DIPs provide as many as 80 sequential-LED outputs -  08/21/08 EDN-Design Ideas A simple circuit uses HCMOS parts and adds one 74HC540 to multiplex the outputs of two 4017 counters for as many as 80 outputs __ Circuit Design by Greg Carkner, Cobourg, ON, Canada

Freeze Alarm -  I chose an accurate thermistor from Keystone as the temperature sensor for this circuit.  This device has a very specific resistance at a particular temperature.  According to the data sheet for the thermistor, the device will have a resistance of 361K at zero degrees C, which is the freezing point of water.  The thermistor is wired into a simple bridge circuit, which uses 1% resistors.  The bridge is connected to a very low power voltage comparator.  The circuit forms a switch circuit, which changes state, when the resistance of the thermistor reaches a certain value.  At zero degrees C the voltage at the non-inverting input of the comparator exceedsCircuit Solution by David Johnson P.E.-May, 2006

Fuse-Panel Emergency Light -  The area around the Main Electrical Panel is usual pretty dark, especially if it is located in the basement.  That's during daylight hours.  At night everything is dark during a powerfailure, or tripped circuit breaker, fuse, etc.  This circuit provides ample time to fix the problem __ Designed by Tony van Roon  VA3AVR

Galloping Neons -  Here is a line powered array of blinking neons designed for continuous duty.  It would be quite dangerous to power a circuit directly from the power line so some form of isolation is needed.  Since most experimenters will not have 120 volt isolation transformers __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Game Show Who's First Indicator Lights -  The circuit above turns on a light corresponding to the first of several buttons pressed in a "Who's First" game.  Three stages are shown but the circuit can be extended to include any number of buttons and lamps.  Three SCRs  (silicon controlled rectifiers) are connected with a common cathode resistor  (50 ohm) so that when any SCR conducts, the voltage on the cathodes will rise about 7 volts above the voltage at the junction of the 51K and 1K ohm resistors and prevent triggering of a second SCR.  When all lamps are off, and a button is pressed, the corresponding SCR is triggered due __ Designed by Bill Bowden

Garage Light & Security Control -  Useful for vehicle owners, this gadget automatically turns on indoor/outdoor garage lights and raises an alert when an automobile enters the garage.  Assume switch S2 is in ‘on’  (closed) state.  When power...__ Electronics Projects for You

Generator Room Light -  At night when power fails, one finds it difficult to reach the generator to start it.  Here is the circuit for a generator room light that automatically turns on at night,...__ Electronics Projects for You

Grand Cherokee Off Highway Lights -  I purchased my 95 ZJ as a daily driver and as a tow rig for my CJ-7.  I have to drive roughly 240 km  (110 miles??) a day.  A lot of this driving is done in the dark, and since I live in the woods, there is naturally a lot of wildlife to be seen, and hit.  I also didn't want to hit another deer  (hit one almost one month after I bought it) .  I felt that the high beams on my ZJ were inadequate, so I decided to add some high powered lights.  I purchased four Pro Comp 8 inch 130 watt lights.  I mounted them on a roof rack that I built, which also holds my spare tire and 55-watt reverse light  (which I get to later) .   __ Designed by Mike Mueller

GrantronICs Projects Christmas Tree -  flashes LEDs mounted to Christmas tree shape PCB, kit from kitsrus.  com __ Designed by © Grantronics Pty Ltd

Green/Red Multiflasher -  NOTE : Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Hacking the Kodak Max Single Use Flash Camera into a Self-Repeating Strobe -  NOTE this approach is recommended mainly for Homebrewing a strobe that is powered by a single 1.5 volt battery.  If you can use a higher supply voltage, there are better ways to do this.   __ Designed by Don Klipstein

Half Bridge Inverter has Variable Frequency -  10/09/97 EDN-Design Ideas Modern electronic ballasts require added features, such as high-frequency preheat for filaments, nominal lamp-power control, and light-dimming capability.  Because the output inverter operates in resonant mode, you can control the power or current of these ballasts simply by varying the switching frequency.  To vary the frequency, __ Circuit Design by Thierry Castagnet, SGS-Thomson Microelectronics, Schaumburg, I - L

Halloween Flashing-Eyes Badge -  Two LED-eyes follow the rhythm of music or speech; 3V Battery-operated device suitable for pins or badges __ Contact: Flavio Dellepiane, fladello @ tin.it

Halloween Pumpkin with Colorful LED Candles -  Extensive tutorial on putting blinking LEDs and different colored LEDs into jack-o-lanterns.  Includes schematics, solderless breadboard photos, and three movies  (the blue pulsing LED is my favorite) .  Great way of getting started in electronics! Although this was written for Halloween, the techniques are applicable for Christmas votive candles as well.   __ Contact: David Cook

Halogen Lamp Saver for Bikes -  Halogen lamps are prone to burn-out owing to their low cold current.  The rapid heating inside the lamp melts the thin filament and cuts the lamp life short.  The circuit described...__ Electronics Projects for You

Halogen light dimmer provides infinite control -  03/16/00 EDN-Design Ideas Modern lighting systems use halogen lamps, most of which run on 12V ac from a transformer.  The dimmer circuit in Figure 1 can change the intensity of the light from zero to maximum.  The dimmer operates at approximately 12V, unlike the usual ones that function by adjusting the firing angle of the 110 or 220V mains supply __ Circuit Design by Suded Emmanuel

HB-LED flashing beacon repurposes switching regulator -  EDN-Design Ideas 08/04/2014     A classic, low-cost “switcher” IC is repurposed to flash a high-brightness LED in this minimal-parts-count Design Ideas -  __ Circuit Design by T A Babu

H-Bridge -  This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first.  Using bigger parts could make it more powerful.  Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it themselves, and I thought it was about time to show a tested H-bridge motor driver that didn't use exotic parts __ Designed by Bob Blick

H-bridge paves New ways for LED lighting -  07/11/13  EDN-Design Ideas Drive a LED array directly from the AC mains in full-wave current-limited mode to realize a flicker-free, energy-efficient solid-state lamp.  The H-bridge is a classic circuit used for driving DC motors in a user-defined manner, such as in forward/reverse direction or PWM-assisted controlled RPM with the help of four discrete/integrated switches or electromechanical relays.  It is widely employed in robotics and power electronics.  This Design Idea is a novel implementation of this technique for driving white-LED arrays directly from the AC mains in full-wave current-limited mode to realize an excellent flicker-free, energy-efficient solid-state lamp.   __ Circuit Design by Subodh Johri

Headlight Minder -  Turns OFF your Headlights, if you forget.  And with a Time Delay, if wanted.   __ Designed by G.L. Chemelec

Heart of LEDs -  Here is a fun project that you can give to that "someone special".  How about Mother's Day or did you forget St Valentine's Day?.   __ Designed by © Grantronics Pty Ltd

Heart-shaped Badge -  The badge consists of eight LEDs arranged in the shape of a heart.  One LED is lit at a time and this 'chases' round the shape.  It would be easy to adapt this project to create other shapes with the eight LEDs.   __ Designed by John Hewes

High Efficiency Halogen Bike Light Dimmer -  This circuit uses a PIC16F84 microcontroller with some software to control20-Watt12V DC halogen lamp

High Intensity Line Powered LED Flasher -  There are times when you would like to generate an intensely bright flash of light using electrical power from the AC line.  The circuit below can drive a one to three watt power LED with about 350ma of peak current.  Since the circuit drives the LED with. . . Circuit by David Johnson P.E.-December, 2008

High Power Desktop LCD Backlight Controller Supports Wide Dimming Ratios While Maximizing Lamp Lifetime -  DN264 Design Notes__ Linear Technology/Analog Devices

High Power LED Flasher -  Power LEDs are becoming more popular these days.  The DC input power to these devices ranges from 1 watt to 5 watts.  Normal LEDs only receive about 0.05 watts.  At this higher power, these devices can emit a lot of light. . . Circuit by David Johnson P.E.-August, 2008

High Power LED Mood Lamp -  In this page we will introduce a great project designed by Toon Beerten.  His project named "DIY Led Mood Lamp" can become a very interesting add-on for your room that's absolutely sure it will impress everyone.  As you can see on the photos, we talk about a color fading lamp, that looks amazing! __ Designed by Toon Beerten

Highway Alert Signal Lamp -  Here is a signal lamp for safe highway driving.  The lamp automatically emits brilliant tricolour light when a vehicle approaches the rear side of your vehicle.  It emits light for 30...__ Electronics Projects for You

HO Model Train Lighthouse Flasher -  HO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

HO Train Lighthouse Flasher Revisited -  HO train sets often have authentic looking scale model homes and buildings.    A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.    I designed a working circuit but I was never pleased with the results.    I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.  … [ . . . Hobby Circuit designed by Dave Johnson P.  E.  , May 2012] . . . Hobby Circuit designed by David Johnson P.E.-December, 2012

How to Make a Business Card Flashlight -  The aim of this article is to make a business/visiting card useful, something that people really do not want to throw away and use as a piece of advertising.  Essence of...__ Electronics Projects for You

How to Make Chase Lights -  This example shows3 track chase lights built from3-Christmas light sets and1-light chaser controller

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

 


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