Up next in How to Do Fun Tech & Science Projects (52 videos)
Teach your children technical skills and science in fun ways with the tech and science projects in this Howcast video series.
You Will Need
- 555 timer
- .6-mm single-core plastic coated wire
- 9-V battery terminal
- 180-ohm resistor
- 470-ohm resistor
- 560-ohm resistor
- 1-k resistor
- 2 1N4148 switching diodes
- 10-k variable resistor
- 1 BC557 transistor
- 2 infrared LEDs
- 2 10nF capacitors
- 9-V battery
- Small circuit board
- Soldering iron
- Large remote control with a switch
- Hot glue gun
- Hot glue
Start setting up the components
Set up the components temporarily on the breadboard. Start by placing the 555 timer on the board so the two rows of pins fit into holes on both sides of the gap in the middle of the board. Connect the negative 9-volt terminal to the bottom row of holes using wire. Connect the positive terminal to the top row of holes.
Make the first round of connections
Connect the180-ohm resistor, a diode, ports 4 and 8 on the timer and the 10-k variable resistor to the row of holes connected to the positive terminal by placing each of the component's leads and wires into the appropriate holes.
Connect resistors and diodes
Connect the 180-ohm resistor to the transistor. Connect the diode directly to another diode. Then, connect the10-k variable resistor to a 470-ohm resistor.
Make the next round of connections
Connect the transistor to the outgoing side of the second diode, the 560-ohm resistor, and the positive terminal of one infrared LED. Connect the 470-ohm resistor to port 7 of the timer and the 1-k resistor.
Connect the LEDs
Connect the negative terminal of the LED to the positive terminal of the other LED. Then, connect the 1-k resistor to ports 6 and 2 of the timer, and to the first 10nF capacitor.
Complete the setup
Connect the negative terminal of the second LED to the second 10nF capacitor and the row connected to the 9-volt battery's negative terminal. Connect the other side of the capacitor to port 5 of the timer. Connect the first capacitor to the row connected to the 9-volt's negative terminal, and port 1.
Test the circuit. Switch on the breadboard by connecting the 9-volt battery to the terminal. Start using the television's original remote. Point your device at the TV, and slowly turn the spindle on the 10-k variable resistor to find the correct frequency. When the TV no longer responds to its remote, the spindle is in the right position and your jammer is working.
Solder the components
Solder the components -- with the exception of the wire running to the negative battery terminal -- on a small piece of strip board.
Hide your creation!
Open up a remote and make sure it's big enough to conceal your circuit. Remove the remote's LEDs and position the jammer's infrared LEDs in their place. Use tape and hot glue to hold the battery, circuit board, and LEDs in place.
Make the switch
Tap into a switch in the remote to turn the jammer on and off by soldering the wire from the 9-volt's negative battery terminal to one lead of the switch. Solder the other lead to the strip on the circuit board that connects to the capacitors, the LED, and port 1. Reassemble the remote, switch on your device and relish the TV mayhem!