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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 07:54 AM

Master Category List - Dave's Circuits

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Remote Control Circuits
  • 1uS LIGHT PULSE RECEIVER PLUS POST AMP
    This circuit is designed to detect very weak light pulses lasting 1uS. It uses a tuned LC feedback network to provide high sensitivity while giving high ambient light immunity. A post voltage amplifier is included with a gain of about X20. The circuit is described in more detail in the receiver section of my Handbook of Optical Through the Air Communications.  Note: The LF357 op amp is no longer available, this circuit is for reference only.
  • 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.
  • 40KHz LASER BURST DETECTOR
    This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst, modulated at 40KHz. It is very sensitive and could be modified for long-range laser communications.
  • 40kHz LED Test Signal Generator
    This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals.

Dave's Remote Control Circuits: 
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Remote Control Circuits
 

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