I've spent the last couple days learning about electronics trying to come up with a solution that has thus-far evaded me.
I need a small, simple, and fast circuit to take pulsed IR light and a 3.6 v battery to switch on a rather powerful LED (2.5-3.5v 0.3-1 amp) only when the IR is flashing at 40 khz or whatever. Small meaning fitting on ~ 2 x 1 cm board (not including battery). Fast meaning <0.5 ms on and off. I'm swimming in photodiodes, phototransistors, transistors, relays, opamps, analog switches, etc and I need something concrete. Any plans I can find either don't tell you which parts or list part numbers that are now obsolete. Please help!
I need a small, simple, and fast circuit to take pulsed IR light and a 3.6 v battery to switch on a rather powerful LED (2.5-3.5v 0.3-1 amp) only when the IR is flashing at 40 khz or whatever. Small meaning fitting on ~ 2 x 1 cm board (not including battery). Fast meaning <0.5 ms on and off. I'm swimming in photodiodes, phototransistors, transistors, relays, opamps, analog switches, etc and I need something concrete. Any plans I can find either don't tell you which parts or list part numbers that are now obsolete. Please help!