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Lamp / Light Control Circuits
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Last Updated: October 24, 2017 02:55 PM


Hour Meter Circuits
 

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

 

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

Ramping Lamp Driver -  This circuit drives any 12v lamp, incandescent or LED type, in a ramping fashion.  Each press of the button toggles the lamp from a fully off mode to a fully on mode.  But, instead of an instantaneous lamp intensity change, the power is slowly ramped up a . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2007

Ramping LED Driver -  The 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. . . Circuit by Dave Johnson P.E.-December, 2007

Random' Flasher for 8 LEDs -  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

Really Bright 10W LED Floodlight -  Light level rivals halogensat MUCH less power!__ SiliconChip

Rechargeable Flashlight Obsoletes Lantern Battery -  12/11/03 EDN-Design Ideas This design idea describes a high-intensity, rechargeable flashlight system that you can build from a 6V lantern-type flashlight.  The rechargeable battery comprises four 2V, 2.5-Ahr (ampere-hour] SLA (sealed lead-acid] cells, similar in size to a standard D-sized battery.  SLA cells are especially well-suited to powering flashlights because of their low self-discharge rate __ Circuit Design by Fran Huffart, Linear Technology, Milpitas, CA

Rechargeable Torch Based On White Led -  Rechargeable torches donít come without problems.  You need to replace the bulbs and charge the batteries frequently.  The average incandescent light-emitting diode  (LED) based torch, for instance, consumes around 2 watts....__ Electronics Projects for You

Reduced Power Sequential LED Flasher -  The 74HC4017 is a neat decade counter which has 10 decoded outputs.  When supplied with a low frequency clock and with a LED attached to each of the outputs, an interesting ten step sequential flasher effect can be produced.  The LEDs can be configured in . . . Hobby Circuit designed by Dave Johnson P.E.-November, 2008

Remote Lighting Controller using a 433mhz AM Keyfob Transmitter -  Here's the remote controlled garden lighting unit which I built for my house.  It needed to control several lighting channels via a remote keyfob, and preferably include a timer to switch the lights on automatically in the evening etc.  I decided to build a controller rather than buy one because 1) it was much cheaper, 2) it was fun and 3) it enabled me to include the timer facility, which wasn't available on any commercial units at reasonable cost. __ Designed by Hans Summers

Remote Solar LED light -  I created this circuit in an attempt to make the simplest possible solar powered project.  It would make for an excellent science fair project, and would also serve as a good introduction to solar powered circuitry.  It may also have some practical uses, such as shedding some light into a dark part of your house.  The idea is simple, the solar panel converts sunlight into a trickle of electricity.  The electricity is used to run a white LED __ Designed by G. Forrest Cook

Repetitive trigger -  Based on the 555 timer IC, useful for strobe lights.  A bit on the 4017 counter IC for multiple flashes and sequences of flashes __ Designed by Don Klipstein

Revisited-Model Train Lighthouse Flasher -  This was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Ring your bell; light your light -  11/11/99 EDN-Desgin IdeasThe circuit in Figure 1 provIdeas a simple and inexpensive way to provide illumination for a dark doorway.  Pressing the doorbell button momentarily rings the doorbell and turns on the porch light.  The porch light remains on for approximately 25 sec and then turns off.  This interval is long enough for a person to find his or her way when it's dark.    __ Circuit Design by Dennis Eichenberg

Ring-Around LED Flasher -  This schematic diagram shows a ring-around LED flasher circuit.  This circuit will turn off two LEDs and turn on the other two until the timing cycle reverses.  This circuit can be configured to flash four LEDs in sequential order  by pressing and holding S1 closed until only one of the LEDs is on then releasing it.

Ringing Phone Light Flasher -  This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop.  Here is such a device.  The ring detect part of this circuit came from [url]http://www.  hut.  fi/Misc/Electronics/circuits/telephone_ringer.  html[/url].  Notes: 1.  You may need to use a lower voltage zener for D1 and D2.2.  You can use a regular relay instead of a solid state relay, but the arcing accross the contacts may destroy it pretty quickly.3.  Be very sure that you have not accidentally connected 120V to the phone line when building and installing this __ Designed by Aaron Cake

Robot Beacon rotating light using PIC12C508 -  Robot Beacon uses a PIC12C508A OTP  (One Time Programmable) 8-pin microcontroller.  There is a lot of controversy over the type of microcontroller that should be promoted in a project such as this.   There are at least three manufacturers of microcontrollers suitable for this application and it's a nightmare trying to work out the best type to promote.   __ Designed by Collin Mitchell

Rotating & Flashing 230V Lights -  This design can be of some interest for those wanting striking light signs, as it can drive up to three 230V lamp strings in three operating modes.  The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer    (T1) and a full wave rectifier __ Contact: Flavio Dellepiane, fladello @ tin.it

Running LED -  Just for fun I designed and tested two running LED circuits based on CD4017.  The first one drives a strip of six LED, while the second one works for a strip of eight LED.  Both circuits work in bidirectional running __ Designed by Andrea-Central Italy

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