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Photo-Flash
Circuits, Page 2
PhotoFlash: #'s - FG - ST - Z Last Updated on:
Monday, October 03, 2011 06:07 PM
Circuits
Designed by Dave Johnson, P.E. :
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HIGH POWER TOUCH SWITCH EXCITER CIRCUIT
If you have hundreds of touch switches that need an excitation signal, then this
circuit is what you need. Its 20KHz 20v peak to peak output signal can supply up
to 3 watts of touch switch excitation power.
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LINE POWERED XENON FLASH TRANSMITTER
This line-powered xenon flash circuit drives a small camera type flash tube. It has an
optical isolator to allow the flash to be safely triggered from some remote device. A
flash rate of 2Hz is possible with the circuit.
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
High Power Touch Switch Exciter Circuit - If you have hundreds of
touch switches that need an excitation signal, then this circuit is what you
need..... [Designed by David A. Johnson]
Light Sensor-741 Based - The circuit as shown act as a light
sensor. Under normal conditions the resistance of the LDR is high, keeping
pin 2 low. When light falls onto the LDR the resistance drops to a couple….
[Tony van Roon's circuit]
Line Powered Xenon Flash Transmitter - This line-powered xenon
flash circuit drives a small camera type flash tube. It has an optical
isolator to allow…. [Designed by David A. Johnson]
Luxeon for Camera Phone Flash PDA & DSC Applications - This reference design
outlines the key considerations in the construction of a solid state, high performance
flash solution utilizing Luxeon LED technology. This design integrates Lumileds’
high power Luxeon Emitters product with a cost effective lens solution to provide the
necessary light output....(added 3/05)
Photo Electric Street Light - This is basically a Schmitt Trigger circuit
which receives input from a cadmium sulfide photo cell and controls a relay that can
be used to switch off and on a street lamp at dawn and dusk. I have built the circuit
with a 120 ohm/12 volt relay and monitored performance using a lamp dimmer, but did
not connect the relay to an outside light. The photo cell should be shielded from the
lamp to prevent feedback and is usually mounted above the light on top of a reflector
and pointed upward at the sky so the lamp light does not strike the photo cell and
switch off the lamp. The photo cell is.... [Bill Bowden's circuit]
Photo Flash at 1.5 Volts - This model is very simple and charges as long as
you hold the pushbutton (added 2/05) [Reverse engineered schematic by Stepan
Novotill]
Photo Flash Charger Minimizes Parts Count - 10/22/98 EDN-Design
Ideas.... Photo-flash and strobe devices operate by discharging a high-voltage
capacitor into a bulb. Charging the capacitor from a battery or other low-voltage
source requires a step-up dc/dc converter to boost the voltage, typically to 300V. One
way to generate the high voltage.... [Design Idea by Steven Chenetz, Micrel
Semiconductor, San Jose, CA]
Photo Timer Circuit - Time is set by potentiometer R2 which provides a range
or 1 sec. To 100 seconds with timing capacitor C1 of 100uF. The output at pin 3 is
normally low and the relay is held off. A momentary push on switch S1 energies the
relay which is held closed for a time 1.1 X (R1+R2).... [author: Ravi
Sumithraarachchi]
