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Lamp / Light
Control Circuits Page 12 Lamp Controls:
#'sAB-C DE-FG-KLM-NP-RST-UV-Z Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits Designed
by Dave Johnson, P.E. :
Visible Light Blocking Filter- This isn’t an electronic circuit
but the drawing below shows the curve for an optical filter made from exposed
color film. The material blocks most visible light but is very transparent to
880nM infrared light. Kodak 100ASA is exposed to "cool white" fluorescent light
for about 5 seconds. ….
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Varying Brightness AC Lamp - In this circuit, an SCR is used to
slowly vary the intensity of a 120 volt light bulb by controlling the time
that the AC line voltage is applied to the lamp during each half cycle.
The circuit is directly connected to the AC power line and should be
placed... [Bill Bowden's web site]
Visible Light Blocking Filter - This isn’t an electronic circuit
but the drawing below shows the curve for an optical filter made from
exposed color film. The material blocks most visible light but is very
transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool
white" fluorescent light for about 5 seconds. …. [Hobby Corner Circuit by
Dave Johnson]
Visible Light Photo Detector - In this circuit, when the light
falling on the phototransistor (Q1) is blocked, its conductance will
decrease and the voltage across Q1 will rise. When the voltage rises above
1/2 of the supply voltage the output of the comparator will turn ON and
the LED will be lit.....scroll to find this circuit..... [from Rob
Paisley's Model Train web site]
Voltage reference stabilizes current sink - 18-Feb-10 Issue of EDN
Produce a stable current for long-term component testing..... [Design Idea by Suded
Emmanuel, Emmanuel’s Controls, Auckland, New Zealand]
Voltage Regulator controls scanner Lamp brightness - 05/13/99 EDN-Design
Ideas.....An image-scanning device performs best when the scanner IC
controls the brightness of the image reflected into the light sensors. The
best way to control brightness is by adjusting the intensity, or light
output, of the fluorescent lamp that shines light.....PDF contains many
circuits, scroll to find this one.… [Design Idea by Chester Simpson,
National Semiconductor, Santa Clara, CA]
Welch Scientific Model 2153c Stroboscope - Here is a schematic for
a typical line operated variable rate stroboscope. This unit is from
Welch Scientific - Model 2153C Stroboscope. These things typically gather
dust in the dusty dark corners of high school physics labs…. [Written by Don
Klipstein]
White LED Head Lamp - A white LED head lamp which can operate with
only two AA batteries. The LEDs are driven in constant current, so that the
brightness is maintained until end of battery life. (added 6/06)
Xenon flash valve - An experiment of the xenon flash valve. (added
10/05)
Xenon Flasher (Colin Mitchell) - You are going to like this project. It
costs less than $3.00, contains six BUILDING BLOCKS, re-cycles a disposable flash
camera and you are going to learn a lot about electronics.
Everyone has seen a disposable flash camera….
Xenon Strobe Light - A xenon flash tube is a triggered gas discharge device.
A voltage may be impressed across the tube and it will not conduct until the xenon gas
is ionised by an external high voltage (typically 3 to 5kV). Once triggered, the gas
becomes a very low impedance, and discharges the storage capacitors in about 1ms (this
varies considerably, but this figure is fine for basic calculations) [Rod Elliott
(ESP)]
Xenon Strobe Light (Aaron Cake) - Disco anyone? Actually, this strobe serves
a much more useful purpose then making it look cool when you dance in the dark. You
can use it to view fast moving objects, look for craks in PC boards (hold the strobe
on the trace side of the board and look from the component side), and it is a great
attention getter in a store window.
Xenon Strobe Light (Linscott) - The way that this circuit works is as
follows. The AC line voltage is rectified by D1 and D2 which connects to a voltage
doubler circuit made up of the two 22uf capacitors. The Flash Freq. Pot and the 10uf
capacitor charge up which triggers the Diac ….(added 6/03)
