Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


DiscoverCircuits.com -- Hobby Corner
Last Updated on: Thursday, November 30, 2017 07:41 AM

Hobby Circuits List

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server



 

More  Remote Control Television Circuits

VCR TV 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.

 

The circuit is housed in a low profile plastic box.  A Serpac H-65AA (Digikey part number SRH65-11B) has a nice battery compartment for two AA cells.  The circuit is powered by two standard AA cells.  I suggest including a 1.5 farad supercapacitor in parallel with the battery to help supply the peak current needed by the 8 LEDs.  A Nesscap EMHSR-0001C5-005R4 has a very low internal resistance and a higher 5.4v voltage rating.

Other supercapacitors might also work.  Just make sure they have a voltage rating higher than 3v. The recommended infrared LEDs are made by Vishay, their part number TSAL6100.  These are available from Mouser, Mouser part number 782-TSAL6100.  These devices emit infrared light in the longer 950nm wavelength, which most infrared remote receivers expect. 

When the VCR remote’s LED turns on, there is a voltage drop of about 1.5v.  This voltage is sufficient to turn on the PNP transistor Q1.  When Q1 is switched on, 3v is routed to the gate of Q2, which switches it on hard.  It routes current to all 8 of the Vishay LEDS.  With a 22 ohm resistor wired in series with each LED, the peak current is set at about 60ma.  This is about 4 times higher than most LEDs are driven in a typical remote.  By wiring 8 more LEDs to form a cluster, the range of the remote should increase by a factor of least 5.  So, instead of 15 feet, with the added light, the distance should be closer to 75 feet.
 

Click on Drawing Below to view PDF version of Schematic

circuit VCR Remote Boost designed by Dave Johnson, PE

More  Remote ControlTelevision Circuits

Hobby Circuits List
eMail David A. Johnson, P.E. about this circuit


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy


Copyright  January, 1998 - November, 2017     David A. Johnson & Associates.  All Rights reserved. 


 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.