Posted by Karl on Feb 16, 2017; 7:37pm
URL: https://www.es-forum.com/DIY-alternative-3-in-1-low-EMF-computer-Mouse-Keyboard-Microphone-tp4030078p4030211.html

Merializer wrote

i also have a "Belkin F8U1500 Infra Red keyboard" (no idea on what hz it operates) but this gives readings on the meter and so should be worse than my other IR keyboard.
This one is also not tolerable for me, instant pain.

Merializer, I thought about sending you a note when you first posted, but I'm just digging into keyboards myself.

I've toyed with doing a fully optical keyboard. The waveguides need to reflect a fraction of light at right angles, but also allow some to pass through so that other key-presses on the same column or row can be detected.

I have CAD software that can create models suitable for a 3D printer. Once you have a working prototype, you can use the parts to make silicone or urethane molds that will let you make multiple copies fairly easily.