A machine I have at home can be controlled with an IR remote. It doesn’t have the IR demodulator integrated, but it should be connected to the device with a stereo minijack connector. On the 2 outer rings there is a 5V power supply, the third one is the code output.
I need to build a few more of these minijack ‘eyes’, for the same type of device where this got lost or broken. I have opened the original thing and there is some circuitry inside which I have to duplicate. The problem is that it’s pretty worn out and hard to read which types of components are used.
There are 5 resistors of different values, 1 electronic capacitor, 1 diode and 2 components (probably FETS but unreadable) that I’m not sure about. The 2 seem to be the same type. Anyway, they have each 3 pins.
I have included the schematic of the thing. The ‘empty’ blocks are the two unknown components. I’m guessing that the circuitry is an amplifier or an inverter or… But I’m not too strong on electronics.
Could somebody help me out? I’m guessing it should be possible for somebody with more electronical knowledge to see what the circuit is doing. I can post pictures of the print later.
The only thing I can read on the missing components is ‘BQ’. The IR demodulator itself reads ‘BY68’.
Thanks a lot!
ir.pdf (22.2 KB)