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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

Master Category List - Dave's Circuits

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Radio Frequency (RF) Transmitter Circuits

175Khz Inductive Pulse Transmitter  -  This circuit is discussed in more detail in the Experimenters Journal. The transmitterís six-inch diameter coil launches powerful magnetic 175KHz ring pulses that can be detected by the circuit below . . . [Hobby Circuit designed by David Johnson P.E.,  06/27/00]


40khz TV-VCR Light Source Repeater  -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful. Using the device, the remote can operate a TV or VCR over three times the normal distance . . . [Circuit by David A. Johnson P.E.,  06/04/00]


Inductive Pulse Receiver (175Khz)  -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough Amplification for the signal to be easily viewed on an oscilloscope . . . [Hobby Circuit designed by David Johnson P.E.,  06/27/00]

Infrared Remote Extender Circuit  -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]


Locate a Plastic Pipe  -  I used this circuit once to track down the location of a plastic pipe, buried underground.  It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/14/04]


Plastic Pipe Finder  -  I used this circuit once to track down the location of a plastic pipe, buried underground.  It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away . . . [Circuit by Dave Johnson P.E.,  12/14/04]


Remote Extender Circuit  -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful. Using the device, the remote can operate a TV or VCR over three times the normal distance . . . [Circuit by Dave Johnson P.E.,  06/04/00]


TV-VCR Light Source 40Khz Repeater  -  This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . [Hobby Circuit designed by David A. Johnson P.E.,  06/04/00]

 


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