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Photo-Flash Circuits, Page 1
PhotoFlash:  #'s - F        G - S          T  - Z

Last Updated on: Wednesday, July 16, 2014 06:35 AM


Circuits Designed by Dave Johnson, P.E. :

·         1.5V TOUCH ACTIVATED SWITCH
A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.

·         12V TOUCH SWITCH EXCITER CIRCUIT
This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.  It can support a cable length of about 2500 feet.  A typical remote switch circuit is also shown as well as a receiver circuit for those switches.

·         3V CAPACITANCE PROXIMITY SWITCH
This circuit was designed to provide a touch activated switch function without an external power supply.  It draws so little power that a single 3v battery will operate the circuit for many years.  It is discussed in more detail in the section on Capacitance Proximity Switch Technology.

·          5 VOLT MOMENTARY OPERATION TOUCH SWITCH
This simple circuit uses a single IC to form a nice touch switch circuit.  A single transistor forms the remote active switch sensor.  Multiple switches can be wired in parallel.  The switch circuit can be located about 500 feet from the control circuit.

·         5V CAPACITANCE TOUCH ACTIVATED MOMENTARY SWITCH
This circuit is discussed in more detail in the section on Capacitance Proximity Switch Technology. The circuit is powered from a standard +5v supply. It has both a source and sink output that change state whenever a metal button connected to the circuit is touched. An earth ground reference is required.

·         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.

·         AIR TRANSPARENCY MONITOR, XENON FLASH TRANSMITTER
This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
1.5v Touch Activated Switch -  A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad. …. [Designed by David A. Johnson]

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12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.  It can support a cable length of about 2500 feet.  A typical remote switch circuit is also shown as well as a receiver circuit for those switches.... [Designed by David A. Johnson]
15 Volt Strobe Circuit -  this circuit uses12V DC instead od mains AC.  This is very good idea if you don't want to mess with direct mains voltage connected circuit or you want to run  Strobe from batteries. (added 4/02)
3 Xenon flashing circuits found in flash for disposable cameras -  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….(electronic schematic / circuit added 05/07)
3v Capacitance Proximity Switch -  This circuit was designed to provide a touch activated switch function without an external power supply.  It draws so little power that a single 3v battery will operate the circuit for many years.  It is discussed in more detail in the section on Capacitance Proximity Switch Technology.... [Designed by David A. Johnson]
5 Volt Momentary Operation Touch Switch -  This simple circuit uses a single IC to form a nice touch switch circuit.  A single transistor forms the remote active switch sensor.  Multiple switches can be wired in parallel.  The switch circuit can be located about 500 feet from the control circuit.... [Designed by David A. Johnson]
5v Capacitance Touch Activated Momentary Switch -  This circuit is discussed in more detail in the section on Capacitance Proximity Switch Technology. The circuit is powered from a standard +5v supply. It has both a source and sink output that change state whenever a metal button connected to the circuit is touched. An earth ground reference is required.... [Designed by David A. Johnson]
741 Based Light Sensor -  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 hundred ohms and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay.…. [Tony van Roon's circuit]
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. …. [Designed by David A. Johnson]
Adjustable Strobe Light -  This Adjustable Strobe Light is the bigger brother of the plain old strobe light.  This one uses a much more powerful "horse shoe" Xenon tube which produces more light. You can also control the flash rate up to about 20Hz. Do not look directly at the flash tube when this thing is on!….....
Air Transparency Monitor, Xenon Flash Transmitter -  This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds.... [Designed by David A. Johnson]
AN 30 LX1995 LED Driver: Camera Flash Application -  Application Note Microsemi 1313 (added 05/06/07)
Beat Tracking Strobe -  project description using AT90S8515 microcontroller and some electronics (added 5/03
Easy Xenon DC-to-DC Converters! -  (design circuit added 8/02)
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,  [Design Idea by Jose Luis Arce, Tecnosuma Havana, Cuba]
Flash Slave Trigger (Aaron Cake) -  Flash slaves are used when you need to supplement1-flash unit with1-or several more.  This slave trigger simply triggers those other units. It does this by "seeing" the first flash (using a phototransistor) and triggering the other flashes a few microseconds later. The sensitivity of the circuit is adjustable to compensate for ambient light or dimmer than usual master flashes. (added 5/02)

PhotoFlash:  #'s - F        G - S          T  - Z

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