TV’s are turned on or off by specific infra-red signals. The TV-B Gone simply emits the right infra-red signal to turn the television off. However, not all televisions use the same signal, so the TV-B Gone has a database that stores many different off codes. When the TV-B Gone is activated, it starts shooting off these signals. There’s lots of TV off codes, so it could take up to 69 seconds for the right code to be emitted.
When the button is pressed, electricity is allowed to flow through the circuitboard and the capacitors monitor the voltage. When a voltage is applied, the transistors allow current to pass to the infrared LEDs. The LEDs then emit infrared light in specific patterns stored in the microchip. The oscillator oscillates at 8 mega hertz and acts as a timer to synchronize the flashing of the LEDs. To ensure that there isn’t a short circuit, resistors limit the current.
Creating this project was much more challenging than I anticipated. I made several notable errors. First, I soldered on the wrong resistor. I attempted to desolder it and accidentally desoldered a wire instead(the wire was in the right place). After that, I couldn’t correctly desolder anything else. The only solution was to cut off the incorrectly placed resistor and solder on the right resistor onto the leads of the wrong resistor. Then I also had to solder on the wire that I’d accidentally taken off. Afterwards, I tested the device. Unfortunately, there was a short circuit and I almost fried the batteries. They were too hot to touch, so pliers had to be used to yank them out. It turns out that I soldered two legs of the same capacitor so they touched, which caused the short circuit. I used a pair of pliers to pull apart the legs, and that fixed the last significant problem.