Attached picture shows my circuit. In it I use only one IR sensor (TSOP1738) but now I want to add another IR sensor (TSOP1738) to my circuit. So my questions are: 1. Is it possible? 2. How (parallel or series)? Thanks.
Yes, both are common emitter output and can share 1 pullup R.
But your supply voltage AC noise ought be < 1mV for best range. ok?
That means the LED may need a separate V+ path to source and ground path must not drop mV to avoid long range Rx noise during detection.
Add a low ESR bulk e-cap to Vcc,Gnd, 100uF?
But 100uF load wont work well on output as the cap will draw large currents.
You need a transistor on outputs to boost current or better CMOS 1 shot to buffer IR Rx then stretch pulse with diode, 1uF, 1Meg decay then output 330 to 1K from CMOS Inverter to LED.