Right resistor for high power LED for sound reader?

Agreed. No disguised homework questions, just somebody trying to build a circuit and put it to use.

I'm curious as to how Mitch made out. The thing was (hopefully) to have been built and working by yesterday, Aug. 11.

Mark

I was wondering, since you're trying to use the cyan audio, does the light source HAVE to be a red LED or could you put a red filter in front of your incandescent lamp?

I've worked on the photo lamp house used on a Cintel (Rank) telecine and at least for that machine, adequate light alignment is difficult. Dolby labs makes LED replacements for the Cintel machine. GG