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I think of the Radio Shack passive infrared card. It was a plastic card that you could place under a light to "charge" and then if you aimed a remote control a
by m463 1y ago
I think of the Radio Shack passive infrared card.
It was a plastic card that you could place under a light to "charge" and then if you aimed a remote control at it and pressed a button - it would glow red.
It would kick up infrared passively into the visible light spectrum.
- wkat4242 1y agoOf yeah i remember those. It was great to check if a remote was working. These days I just use my phone camera. The IR filter isn't perfect and IR leds are tons brighter than visible ones so if you point it right at the camera you can easily see it.