Hi,
This might be a fun electronics riddle for those who are into it. I have two of these 38kHz remote IR receivers. I burned out one of them. I don't know the model number, and I'm not sure what pin arrangement was used to burn out the first one (should've taken better notes).
There seems to be no standard for which pin is 5V+, Ground, and Signal. I don't want to burn out the second one. Is there a way to figure out which pin is which by measuring the resistance using multimeter?
Pins when I'm facing the "bulge" part, as seen in the image above. All resistance values were in MOhms, with the polarity shown in the table.
LEFT
Middle
Right
31
+
18
13
+
30
40
13
The marking in the back of the receiver is "6Xt2" and "SB25".
Sorry there is no way of telling from resistance values because this is an active device. To prevent frying try using a 1K seriese resistor on all three pins as you play about with it. You also need an oscilloscope to look at the signal as you try and power the other two pins.
I've tested on an IR receiver I have, I can clearly measure the pullup resistor between the V+ and OUT pins, which is the same when inverting the probes. But you don't measure that, maybe the output stage is different.
In that case, it would be really difficult to tell who's who without actually testing
If it is a Vishay receiver, it will have the model number in very very small print on the top.
I usually need good light and a magnifying glass to read them.
The IR detectors I've seen seem to operate like a PNP transistor You might try the transistor tester in a multimeter and see if you get a readout when you shine an IR remote control on the detector.
