IR Source

IR Source

This device is essentially an IR flashlight with a single IR LED. UV light sources are a dime a dozen, but IR sources are thin on the ground, probably because no one ever needs one anyway. None the less, I've made one. I built in a couple of extra features for no good reason that I can think of other than that I wanted to.

EDIT: 5/26/24 - Complementary IR Detector now posted here...

https://www.thingiverse.com/thing:6637888

There are no on-board batteries. Power should be 5-6 V DC to the 5.5 mm barrel jack with the pin positive. The device is push-button activated; there's no hard on-off switch.

If you like the battery box that's visible in a couple of the images it's at...

https://www.thingiverse.com/thing:6036477

There is a red LED in the cover to provide some confirmation that there is in fact current through the IR LED.

The pot controls current through the LED pair, which are in series. With the specified supply voltage, the current range is