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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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Remote Control Circuits
 

Boost Infrared TV/VCR Remote Signal  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.  . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/07/05]


Infrared TV/VCR Remote Booster  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.  . . . [Circuit by Dave Johnson P.E.,  10/05/05]

IR TV/VCR Remote Booster  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.  . . . [Hobby Circuit designed by David A. Johnson P.E.,  10/05/05]

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 Dave Johnson P.E.,  06/04/00]


 
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 David A. Johnson P.E.,  06/04/00]


 
IR Remote LED Indicator Light  -  There are times when you would like to transmit a signal from one LED indicator light to second LED at another location.  The circuit below works well for this application.  It takes advantage of the fact that the internal infrared LED inside an opto-isolator . . . [Circuit by Dave Johnson P.E.,  12/28/08]


 
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 David Johnson P.E.,  06/04/00]


 
Remote LED Indicator Light  -  There are times when you would like to transmit a signal from one LED indicator light to second LED at another location.  The circuit below works well for this application.  It takes advantage of the fact that the internal infrared LED inside an opto-isolator . . . [Circuit by David Johnson P.E.,  12/28/08]


 
Remote Range Extender TV/VCR  -  I often get frustrated by how poor some infrared remotes in many new electronic devices operate.  I used to be able to turn on the TV from 30 feet away.  Now, it seems that I have to get within 15 feet.  To address this issue, I designed the circuit shown below.  The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices.  The result is a communications range some 4 to 5 times longer. . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/14/00]


 
Remote Relay Driver  -  I received a call from a Discover Circuits visitor who wanted a simple way to turn on an outside lighting system using a low voltage control line.  I suggested the simple circuit below.  The circuit is powered by a 9v battery and uses a very efficient latching relay.  Two low voltage wires lead from the a toggle switch to the remote relay.  A toggle switch selects either the on or off condition of the relay.  The relay contacts are rated at 10 Amps, so the small relay can handle a sizeable amount of power. . . . [Circuit by David Johnson P.E.,  04/06/14]


 
Remote TV Camera Power  -  A while back I received an email from a company with a problem. They needed a security camera installed at some remote location.  The camera was a high quality color camera sending out standard NTSC video through a long 500 foot 50 ohm coax cable.  With some difficulty they got the coax strung.  They were told that there would be AC power near the camera location to power that device.  But, they then learned that in fact, there was no power available.  They thought about using a solar panel and a battery but they decided to call me for help instead.  Was there some way to power the camera without stringing another cable? . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/03/11]


 
Transmit to a Remote LED Indictor Light  -  There are times when you would like to transmit a signal from one LED indicator light to second LED at another location.  The circuit below works well for this application.  It takes advantage of the fact that the internal infrared LED inside an opto-isolator . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/28/08]


 
TV /VCR Remote Range Extender Circuit  -  I often get frustrated by how poor some infrared remotes in many new electronic devices operate.  I used to be able to turn on the TV from 30 feet away.  Now, it seems that I have to get within 15 feet.  To address this issue, I designed the circuit shown below.  The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices.  The result is a communications range some 4 to 5 times longer. . . . [Circuit by David A. Johnson P.E.,  10/05/05]


 
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 Johnson P.E.,  06/04/00]


Remote Control Circuits
 

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