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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 07:47 AM

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Sensors / Detectors: Peak Detectors Circuits
  • AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER
    I designed this circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch Fresnel lens at the transmitter end and a matching 12-inch lens with a PIN photo diode at the receiver. The receiver system was connected to a weather station and a computer to collect the changes in intensity of the light flashes under different weather conditions. It has the potential for a 30+-mile range. I have also used this system to conduct cloud bounce experiments.
  • Audio Signal Detector Switch
    This circuit will activate a transistor switch when it detects at least 50mv peak to peak of an audio signal.  It could be used to turn on a relay, routing the signal to were it is needed. (added 7/06)
  • PRECISION AC PEAK DETECTOR
    This unique circuit uses a very inexpensive voltage comparator to form a peak detector. The DC voltage produced tracks the positive peak of the input signal.  It works from about ten millivolts to about 10 volts peak to peak.  The maximum frequency is about 150KHz.

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