Testing TSOP1738

Thread Starter

jj_alukkas

Joined Jan 8, 2009
753
Hello,

I have 2 Tsop1738 IR receivers which when used in a usb player ckt, both doesnt seem to respond. So I would like to know if there is any simple way to test them ? I tried giving 3.6v to the vs and grounded pin 1 and tested for a voltage on the output pin, but it always shows a constant voltage whether I use a remote or not. Both are showing the same response. Can I conclude that the TSOP's as blown?

Sorry for making this new thread as there was an existing thread on this forum, but it was stated as a member that he had responded to the thread starter on another forum.
 

Thread Starter

jj_alukkas

Joined Jan 8, 2009
753
Thank you for that page :) After I tried running the IR chip at 5.1V, I still didnt get the tsop working on the usb board ckt or led ckt, but the voltmeter shows a rise of 0.01v from say 3.30 to 3.31v on the Vout when I press buttons on the remote. I guess thats not good as it should stay low and when i press a button it should go high by atleast a volt or 2 ?

when I gave 3.6v a supply previously, there was no difference at all. So what should I conclude?
 

bertus

Joined Apr 5, 2008
19,950
Hello,

The TSOP1738 needs a modulated 38 kHz signal that is pulsed.
If the signal is not pulsed the AGC will reduce the signal and the sensitivity will fall dramaticaly.

Here are some pages from the EDUCYPEDIA with IR remote control information:
Infra Red Circuits
RC5 code

Bertus
 

Thread Starter

jj_alukkas

Joined Jan 8, 2009
753
Hello,

The TSOP1738 needs a modulated 38 kHz signal that is pulsed.
If the signal is not pulsed the AGC will reduce the signal and the sensitivity will fall dramaticaly.

Here are some pages from the EDUCYPEDIA with IR remote control information:
Infra Red Circuits
RC5 code

Bertus
Yes, I was using the remote which came with the usb board. But, good news, one of the two tsop's i had were blown. on testing the second, I got a good 5v as high on the vout and when i press a button, i get a drop of 0.5 volts!! so I wired it onto the usb board with a seperate 5v line for the tsop and guess what it worked!! I still wonder why the board only has a 3.3v line for vd for TSOP to run ???

Anyway Thanks a lot Bertus!! My problem is solved!
 
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