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Lamp / Light Control Circuits
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Last Updated: December 01, 2017 05:50 AM

Circuits Designed by Dave Johnson, P.E. :

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


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

DSP Musicolour Light Show; Pt.2 -  In last month's first part, we described the circuit operation of the DSP Musicolour.  In this instalment, we guide you through the construction.  The operation of the firmware and troubleshooting tips will be described next month.  In this issue there are also notes and errata for the schematic published last month.__ SiliconChip

DSP Musicolour Light Show; Pt.3 -  In last month's article, we detailed the construction of the DSP Musicolour.  In this month's article, we guide you through the final testing of the DSP Musicolour and give troubleshooting tips.  We also explain the operation of the firmware in more detail as well as discussing possible accessories.__ SiliconChip

DSP Musicolour Pt.1 -  This DSP Musicolour accepts audio input signals and drives coloured lights "in tune" with the music.  Its four output channels respond to different audio frequency bands and the brightness of the lights is in direct proportion to the amplitude of the frequency components.  A dot-matrix LED menu display is featured on the front panel and this also functions as a spectrum analyser or VU meter.__ SiliconChip

DSP Musicolour Pt.4 -  With a small and low-cost add-on PC board, the DSP Musicolour can be operated via an infrared remote controlvery handy if you want to use it in hard-to-reach places.__ SiliconChip

Dual Alternating Flashing Light -  This project is best for mounting on a layout to light a crossing or ring a bell.   __ Designed by ML Rollins

DUAL- COLOUR STROBOSCOPE -  Stroboscope is a device used to make a cyclically moving object appear slow-moving or stationary.  This is realised by illuminating the object intermittently with short pulses of light.  Stroboscope is used in the study of insect flight.  It can also be used for experiments with simple pendulum, studying details of rapidly moving objects and strobo-animation.__ Designed by Raju Baddi

Dual LED Flasher -  Some useful circuits using the LM555 IC.  Scroll to find the Dual Led Flasher circuit __ Designed by Jose Pino

Dual light timer based on PIC-Automatically turn off the lights after 10 minutes -  Uses PIC12F629 __ Designed by Peter Jakab

Dual Monostable Drives Quasiresonant Inverter -  02/17/97 EDN-Design Ideas A zero-voltage-switching  (ZVS) controller usually integrates a one-shot circuit, embodied in a VCO system.  An error amplifier monitors the output voltage and adjusts the VCO's off-time to keep the output value at a constant level.  Each on-time period commences as soon as the primary voltage drops to zero, thus eliminating on/off commutation losses associated with the switching element __ Circuit Design by Christophe Basso, Sinard, France

Dual Powered Lighting -  Power a lighting circuit from renewable energy or mains electricity.   __ Designed by REUK-Renewable Energy UK website

Dual Tandem Flashing Light-Powered by a 9 Volt Battery -  This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure.     (Personally, I can't recommend you buy anything but the Rollins Railroad Designs kit; for $4.00 you can't go wrong.  The 555 IC is about $1.50 by itself at Radio Shack) .  If you choose to buy all the parts yourself, realize you need ONLY two LEDs, not two of each; you should be able to mix and match colors.   __ Designed by ML Rollins

Dummy Alarm -  This project makes a superbright LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm.  The circuit is designed to use very little current to prolong battery life so that it can be left on permanently.  This is a simple project, ideal for a beginner __ Designed by John Hewes

Easy Xenon DC-DC Converter using LM386 -  This DC-DC converter  ("inverter") needs nothing but unmodified Radio Shack parts.  You don't need to build or wind any coils or transformers.  This is a cheap-and-dirty experimenter's circuit.  I tested this and it worked for me, but I disclaim all warranties! __ Designed by Don Lipstein

Efficient LED Blinking for Embedded Systems -  Smart hardware design can simplify the embedded software and make it more reliable.  Designers use blinking LED signals to indicate different status and for inbuilt testability.  Making an LED array blink...__ Electronics Projects for You

Efficient LED power supply has battery backup -  Power three to six LEDs from an ac- or dc-power source and charge a backup battery.  LEDs find wide use in emergency lighting because of their high efficiency __ Designed by Zhihong Yu, Juno Lighting Group, Des Plaines, I - L;

Eight LEDs Random Flasher -  This project uses a 4026 counter and display driver IC to flash eight LEDs in an apparently random manner.  It can be used to create a display of your choice.   __ Designed by John Hewes

El Cheapo Lightning Effect -  Plans to simple floodlight using an office rubbish bin made of metal and a "photoflood" bulb

EL wire eye candy -  The 8-channel sequencer will switch the wires according to programmed patterns.  It uses a Basic Stamp II microprocessor.  The Mikey Sklar's el pants & bag and Greg Sohlberg's Rhino-8 sequencer.  I used the Basic Stamp II for the processor, and went with Greg's suggestion & used a 9-pin connector, with 8 HV outputs and one "common", instead of individual 2-pin connectors for each of the 8 EL wire channels.   __ Designed by guerroloco

Electric Power Controller -  suitable as dimmer for 100-Volt lamp up to1200W __ Designed by Seiichi Inoue

Electronic Ballasts using the Cost Saving IR215X -  App Note AN-995 from International Rectifier

Electronic candle -  This  circuit  will  detect  light  falling  on  the  Light Dependent Resistor  (LDR or CdS) .   When light falls on the  LDR  the  arrangement  of  resistors  at  the  base  of  the transistor T1 gives a change of voltage.   This biases or turns  on  the  transistor  which  turns  on  T2,  allowing sufficient  current  to  flow  to light the globe.   The arrangement of the  resistors at the base of T1 is called a Potential Divider.   It is adjusted to suit ambient light conditions by the variable resistor VR1.   A typical use would be to set the project up in the refrigerator.  The light will light up in another room if you have enough wire, or you  could put  a  buzzer  in  instead  of the light and catch whoever is raiding the refrigerator.__ CdS Electronic

Electronic Candles -  Here is a simple circuit that can produce the effect of candle light in a normal electric bulb.  A candle light, as we all know, resembles a randomly flickering light.  So,...__ Electronics Projects for You

Electronic Christmas Tree -  Schematic + Info + pictures __ Designed by Lennie Zink

Electronic Fluorescent Lamp Ballast -  International Rectifier App Note in PDF format

Electronic Night Light -  This circuit for an electronic night light was submitted by Adam from Canada.  I have provided the notes __ Designed by Andy Collison

Electronic Street Light Switch -  Here’s a simple and low-cost street light switch.  This switch automatically turns on the light at sunset and turns it off at sunrise.  The automatic function saves electricity besides man-power.  Broadly, the...__ Electronics Projects for You

Electronic Transformer DIMS Halogen Lamp -  05/11/00 EDN-Design Ideas A typical, switched-mode power supply for a halogen lamp, commonly known as an electronic transformer, is a clever and simple device.  However, it has some limitations, such as its inability to dim the lamp.  Figure 1 shows a simplified schematic of a typical low-voltage halogen-lamp transformer without the protection circuits and EMI filter.  Q1 and Q2 with C2 and C3 comprise a classic, half-bridge topology that works in self-oscillating mode.  The circuit provIdeas positive feedback by placing the primary windings of transformer T1 in series with the bridge output.  To achieve a high power-factor value, a rectified but unfiltered mains voltage supplies power to the circuit.  The working frequency is approximately 30 to 40 kHz.   __ Circuit Design by Robert Magdziak, Warsaw, Poland

Emergency 12V Lighting Controller -  This easy-to-build project automatically turns on the power for 12V emergency lights within a second or two of a mains power failure.  Build it and you won't have to search for candles or your torch in the event of a blackout.__ SiliconChip

Emergency Backup Lamp -  This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2 or from room ambient light.  So, if the power fails at night, the lamp will light.  The 6 volt lamp should be directed away from the photocell __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Emergency Lamp & Turning Indicator -  White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage.  These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You

Emergency Lamp Battery Protector -  Emergency lamps do not have a facility to prevent the deep discharge of battery if the lamp remains on during day time.  The fluorescent lamp filament also damages if it is glowing in low battery voltage.  This causes blackening of the filament side that indicates the damaged filament.  So we have to switch off the lamp in the __ Designed by D Mohankumar

Emergency Light -  A simple circuit that activates a light when the power is out.  A version with a lightbulb and another with white LED light included.   __ Designed by Jose Pino

Emergency Light & Alarm -  Powered by two AA NI-CD batteries; Four switchable options __ Contact: Flavio Dellepiane, fladello @ tin.it

Emergency light flasher schematic -  If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do.  A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device.  The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna.   __ Designed by Guy Roels ON6MU

Emergency Light with Charger -  White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage.  These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You

Emergency Photo Lamp -  This emergency light can be powered either by a rechargeable battery  (like 3.6V Ni-Cd) or a non-rechargeable battery  (3.0V CR2032) .  The white LED  (LED1) glows automatically when the power fails and...__ Electronics Projects for You

Emergency strobe flasher generates 250V -  08/05/99 EDN-Design Ideas Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery.  The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse.  To generate the 250V dc, IC1,  __ Circuit Design by Jose Luis Arce, Tecnosuma Havana, Cuba

Emergency Vehical Flasher -  There are several projects on this page.  Please scroll down to find the LED Chaser.   __ Designed by Jason KE4NYV from Roanoke, Virginia

Emissions killers trap common-mode currents -  03/02/98 EDN-Design Ideas NOTE : Contains multiple circuits, scroll for this one.  An unshielded twisted-pair cable that is transformer-coupled to a digital system can easily act as a radiating antenna, not because of the differential analog signal the cable carries, but because of common-mode currents induced by unwanted stray coupling from the digital portions of the system.  These currents from fast digital transitions contain harmonics in the hundreds of megahertz and can be a nightmare to design engineers who have to make systems conform to radiated-emissions limits. __ Circuit Design by Glen Chenier, Fujitsu Network Communications, Richardson, TX

End of Train Flasher -  Schematic + Info + pictures __ Designed by Lennie Zink

Expandable 16 Stage LED Sequencer -  The circuit below uses a hex Schmitt Trigger inverter  (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers  (74HCT164 or 74HC164) to sequence 16 LEDs.  The circuit can be expanded to greater lengths by cascading additional shift registers and connecting the 8th output  (pin 13) to the data input  (pin 1) of the succeeding stage.  A Schmitt trigger oscillator  (74HC14 pin 1 and 2) produces the clock signal for the shift registers, the rate being approximately 1/RC.  Two additional Schmitt Trigger stages are used to reset and load the registers when power is turned on.  Timing is not critical,  __ Designed by Bill Bowden

Experimental Cross Fader -  ideas to modify simple rotary light dimmers to make a cross-fader

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


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