Check out the infrared alarm circuit too. For a wider range of the infrared ... IC1 output will then be a perfect rectangular wave. Working with the receiver and the transmitter at the same time feed ...

This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The ...

If your up for starting a quick little project, Hardware Secrets can show you how to build your own IR transmitter for the PC. As the article clip states, if you can use a solder iron, you can ...

[GreatScott] does exactly this in the video after the break, building both a transmitter and receiver ... testing two popular 555 transmitter circuits. One uses the control voltage pin to input ...