‘Revenge Is A Dish Best Served Cold’


Creative Commons License This work is licensed under a Creative Commons Attribution-NoDerivs 3.0 Unported License.

N.B. : This article is compiled…

Courtesy: TechLib

Do you have an incessant channel hopper that is driving you crazy? Teach him a lesson with ‘TV Remote Control Jammer’ circuit.

Do you have an incessant channel hopper that is driving you crazy? Or perhaps you simply want to enforce your own selections. The TV Remote Control Jammer will do the trick.

This circuit is a redo of an older design which is not effective on modern remotes.   Modern remote controls are hard to jam but with a little care this circuit will do the job. The circuit is just a flasher operating at 40 kHz which is the carrier frequency used by common remote controls. The strong 40 kHz infrared flashing interferes with the signal from the remote.

sche...sche...wiring diagram

The 50k potentiometer is adjusted to achieve a 40 kHz flash rate (around 20 kohms) and this adjustment is fairly critical. When it is set properly and the LEDs are pointed directly at the receiver’s photodiode, the remote control will stop working. The LEDs are operating at about 30 mA when on but the duty cycle is low and the circuit only draws about 7 mA.

Trouble may be encountered if the frequency is set wrong, the LEDs are not pointed correctly, or if the remote is a real brute. More light may be had by adding another resistor and diode string from the collector to the switch but the most likely problem is the frequency adjustment.  Use a 10-turn pot and adjust it slowly while changing channels. Or use a frequency counter or oscilloscope to set the frequency, if possible. Make sure that the current drain is about 7 mA – if not, check the polarity of the diodes. A photodiode infrared receiver is handy for checking the light output and comparing it to the remote’s.

Advertisements

8 thoughts on “‘Revenge Is A Dish Best Served Cold’

  1. Pingback: SiteMap: Published Articles « Prerna Jain

  2. Pingback: SiteMap: Categorised List Of All Articles « E-Prerna.Com

  3. Pingback: My Life As A Tinkerer « E-Prerna.Com

  4. Pingback: SiteMap: Published Articles | E-Prerna.Com

  5. Pingback: SiteMap: Categorised List Of All Articles | E-Prerna.Com

  6. Pingback: My Life As A Tinkerer | E-Prerna.Com

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s