Design: dual CMOS 7556 (Maxim & Intersil PN ICM7556)
Design 1
Side 1, 100Hz, 90% high+5v (9000uS), 10%low_0v(1000uS) to /reset of
Side 2, 40kHz 50-50 direct input from 100Hz low Output for 1mS
Side 2 output: 40 ea 40kHz 50-50 duty +5V pulses followed by 9mS low
Design 2
Side 1, 100Hz, 80% high+5v (8000uS), 20%low_0v (2000uS) to /reset of
Side 2 40kHz 50-50 direct input from 100Hz low Output for 2mS
Side 2 output: 80 ea 40kHz 50-50 duty +5V pulses followed by 8mS low
Each side 2 output drives a logic level MOSFET driving IR LEDs.