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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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Lamp / Light Control Circuits
Lamp Control Circuits Designed by David Johnson:
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1 Watt Fluorescent Lamp Night Light  -  If 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 . . . [Circuit by Dave Johnson P.E.,  03/26/99]


1.5v LED Flasher Version A  -  Many published circuits that flash LEDs need 3 volts or more.  This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1.5 volt AA alkaline battery cell. The circuit uses a charge pump technique to provide . . . [Circuit by Dave Johnson P.E.,  06/04/00]


10 LED Sequential Flasher using Low Powr  -  A 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 Johnson P.E.,  04/17/11]


12 Volt Lite/Dark Lamp Switch  -  Often, for certain low voltage lighting systems; you would like to turn off the lights during the bright light of the day.  Most commercial day/night switches are designed for AC lighting.  The circuit below was designed for a 12v DC system.  But, it could be modified for other voltage as well.  It uses an inexpensive phototransistor as the light detector. . . . [Hobby Circuit designed by David Johnson P.E.,  06/30/08]


12v Light/Dark Lamp Switch  -  At night, this circuit will route current to a 12v lamp, turning it on . . . [Circuit by David Johnson P.E.,  07/09/06]


14v LED AuxiliaryLamp with a 60 Watt Lamp  -  This circuit controls power to a standard 60 watt lamp plus generates an auxiliary 14v DC supply which can power an automotive style 12 LED array . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]


1W White LED Night Light  -  As many of you know, I have a pet peeve with poorly made LED night lights.  Often, the light from the LED quickly fades, so within months, the light is useless.  I have posted several versions of modified night lights using higher quality components.  This circuit is yet another version, which produces much more light than those other designs. . . . [Hobby Circuit designed by Dave Johnson P.E.,  11/06/08]


3 Minute LED Closet Light  -  The 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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  11/14/10]


3 Volt Low Battery Voltage Flasher  -  This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment . . . [Circuit by David Johnson P.E.,  01/01/98]


3-Minute Closet Light  -  I 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 Johnson P.E.,  12/25/11]


3-Minute Closet Light #2  -  The 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 Dave Johnson P.E.,  11/14/10]


3v Powered Super Bright LED Flasher  -  I 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.,  04/22/09]


3v 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 . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]


5w Fluorescent Lamp Intensity Modulator  -  The 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 Dave Johnson P.E.,  06/27/00]


60 Watt Lamp With Auxiliary 14v LED Lamp  -  This circuit controls power to a standard 60 watt lamp plus generates an auxiliary 14v DC supply which can power an automotive style 12 LED array . . . [Circuit by Dave Johnson P.E.,  07/09/06]


6V to 24V DC Day/Night Switch  -  Using an inexpensive phototransistor, this circuit switches 12v to 24v power to a load, whenever the sun goes down . . . [Circuit by Dave Johnson P.E.,  07/09/06]


9v Powered Xenon Photoflash Controller  -  This 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 Dave Johnson P.E.,  06/03/00]


AC Line Powered LED Flasher  -  Some of the latest LEDs are amazing.  They can produce a surprising amount of light with very little current.  In the light flasher application shown below I take advantage of a nice surface mounted LED from King Bright.  This flasher circuit draws only about 3ua of average current from the AC power line to flash this green LED.  This flasher might be used as a power indicator light . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/07/08]


Advertising Badge with Flashing LED #1  -  I 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 . . . [Circuit by David Johnson P.E.,  03/26/02]


Advertising Badge with Flashing LED #2  -  This circuit uses a CD4013 dual D Flip/Flop IC.  A single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing . . . [Circuit by David A. Johnson P.E.,  03/26/02]


Lamp Control Circuits Designed by David Johnson:
Page 1,   Page 2,   Page 3,   Page 4

Lamp / Light Control Circuits

Master Category List - Dave's Circuits


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