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Light Beam Communications Circuits, Page 1
Freespace Circuits:  #'s      A - K    L- M     O - Z

Last Updated on: Monday, October 03, 2011 06:07 PM


Circuits Designed by Dave Johnson, P.E. :
  • 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 starting method is a bit crude but the circuit does work.

  • 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.
  • 10MHz TO 20MHz LASER LIGHT DETECTOR
    This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity.
  • 20MHz VCSEL 3mW LASER TEST CIRCUIT
    This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC. The circuit can easily be modified to transmit signals from kilohertz to about 50MHz.
  • 30KHZ LIGHT RECEIVER AMP
    This circuit uses NPN darlington transistor to amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery.

Free Space Communication circuits #'s continued


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