IR receiver (3 pin) broken? - Page 1
Forum section: electronics / beginners

author: onesixright
author_rank: Frequent Contributor
timestamp: October 08, 2017, 02:15:53 pm
content: Hey,Anybody know of a quick test for a IR receiver. It has 3 pins ('105' written on the back). I did a quick Google search, but I found different pin outs.I have not a clue what is the pin out is supposed to be.Thanks!

author: xtronical
author_rank: Newbie
timestamp: October 08, 2017, 02:20:48 pm
content: Shine your TV remote at it, most are responsive to this carrier frequency (around 36-38khz)

author: onesixright
author_rank: Frequent Contributor
timestamp: October 08, 2017, 03:00:34 pm
content: Yeah, but which pins? I should see some mV?Did do measured the R on each pin combo, its round 0.15 R.

author: xtronical
author_rank: Newbie
timestamp: October 08, 2017, 03:15:50 pm
content: All I'd do would be to supply 5v and gnd on 2pins, probe the third. Repeat taking note of the combos used. If it's a common one used for TV etc. then will just go low or high when getting valid signal. It should survive incorrect connection for a few moments. Where has this part come from?

author: Twoflower
author_rank: Frequent Contributor
timestamp: October 08, 2017, 03:56:37 pm
content: Attaching wildly 5V to the pins you'll have a good chance to damage the device. As there are probably ESD protection diodes build in. At least limit the current to reasonably low limits (e.g. 3.5mA, as the max power consumption is 3mA) would increase the chance the device will survive that torture. And use 3V to reduce the energy applied further down.Edit: Actually Vishay recommend to ad a series resistor to the power supply of 33Ohm...1kOhm. But the schematics showing a 33kOhm resistor between plus and data out. Which does not match your measurements. Either that device is defective for sure or that's something else (e.g. a photo transistor). Can you post a picture of the device?

author: xtronical
author_rank: Newbie
timestamp: October 08, 2017, 04:06:12 pm
content: Yes, sorry, you should current limit.

author: onesixright
author_rank: Frequent Contributor
timestamp: October 08, 2017, 05:08:30 pm
content: Its a part I bought long time ago, but not a clue what it is. See attached the photo.

author: xtronical
author_rank: Newbie
timestamp: October 08, 2017, 05:18:10 pm
content: Could be one of the TSOP382xx series, in which case far left -ve, middle +ve and far right digital signal out. They respond to different carrier frequencies of IR i.e. 30 to about 56Khz (the more common being 36 or 38). If your remote is vastly different than what it wants you may not get much of a response. If the remote does nothing then hook up a IR LED to a MCU or oscillator circuit to generate frequencies from 32K to 38K in 2K steps. If you've got an Arduino this is trivial.

author: Twoflower
author_rank: Frequent Contributor
timestamp: October 08, 2017, 05:21:20 pm
content: That could be one of these integrated IR-receivers.You said you measured 0.15Ohm between all pins. Have you tried to reverse the test-leads (reversing the polarity of the test-current)? If you measure the same that way I would say this device has released the magic smoke...

author: madires
author_rank: Super Contributor
timestamp: October 08, 2017, 06:06:28 pm
content: It's a standard IR receiver module, likehttps://www.vishay.com/docs/82459/tsop48.pdf.

author: onesixright
author_rank: Frequent Contributor
timestamp: October 08, 2017, 09:57:40 pm
content: Quote from: Twoflower on October 08, 2017, 05:21:20 pmYes, I did. Its same.Well I gonna order some new ones.I did try to hook it up (different ways), but it show nothing when point a few different remote controls.Thanks all!