how many ir leds can a 555 ic drive at 38 khz, astable mode. we are using 5 tsop and circuit becomes very complicated if 5 different 555 ics are used for 5 ir led .
A 38kHz TSOP IR receiver IC will reduce its gain when it receives continuous 38kHz IR pulses. The datasheet explains that the 38khz must be in "bursts" which is groups of 38kHz pulses and it says how many pulses in each burst. Use a second 555 to make the bursts by gating the 38kHz oscillator on and off.