whatthedonut

Thank you. From some snooping around on the Vishay website, I figured that the receiver on our unit was like the TSOP752 and all the variants have the same 4-pin layout so pin 3 = Signal Out. With this knowledge, I played around with the unit last night and came to the same conclusion that simply soldering the leads of a plug will not work. However, I think I've found a solution. I removed the surface mount IR receiver and had direct access to the solder pads underneath. Using a multimeter on the continuity testing mode, I figured out the solder pads underneath the circuit board and those under the IR receiver were not the same. I soldered the two leads from my mono plug to the "OUT" and :Ground" pins under the IR receiver. I hooked this up to my IR repeater system and the Flirc USB to my laptop. When I tried to teach the Flirc some remote codes (through the IR receiver on my IR repeater system), the USB would disconnect/reconnect to my laptop and the software would flash a "Transfer error." The device registered some action, but it was not the expected input and the hardware/software crashed. I researched some more and found a relevant post at avsforum. I plan on using an optocoupler with 2 legs connected to the FLIRC and the other two legs connected to the 3.5mm mono plug (essentially in between the Flirc USB and the 3.5mm mono plug). If I understand correctly, I think the optocoupler will demodulate the incoming IR signals.

Thank you. However, the receiver on the Flirc USB is 4-pin, not 5-pin.

Hello, Does anyone know the pinout of the IR receiver on the Flirc USB? I would like to modify the device to add a female 3.5mm mono plug to the device rather than sticking an IR flasher on there. When I open the plastic cover of the Flirc USB, I see 4 solder pads under the IR receiver on the bottom of the circuit board. I think I've figured out +V pinout is the right-most solder pad under the "C" of the screenprinted FLIRC logo. More importantly, I need help to understand which is the "signal" and "ground" pads. Any help is appreciated. Thank you!