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vallikranth
09-22-2007, 08:21 PM
hi
i purchased a tsop. But there was nothing written on it like tsop1738 or so. Is there any other means to identify at what freq a given tsop is going to work?

rao
09-23-2007, 06:57 AM
only way then is.. you run it at 38 Khz.. you must have seen the chart in the IR article by Vikas..

That is the average range of frequencies it would work on..

try cycling it through and find out what gives the maximum range.. The max range would be the actual frequency..

Rao

vallikranth
09-24-2007, 07:32 PM
hi
I tested using function generator as suggested by u. There was a transition from 5v to 0v for all frequencies in the range 15 to 60khz. Now how to decide ???
also I bought another one in some other shop. On that it was written
V 69 332
TSOP.1356
and the shop wala told that this is the one used in TV. Is this tsop 1738???

rao
09-25-2007, 04:22 AM
TSOP 1356 is fine!!

this time just modulate your IR pulse to 56Khz.. thats it...

http://www.digchip.com/datasheets/parts/datasheet/513/TSOP1356.php

download the datasheet and go through it..

You dont need to stick to 1738..not written in the Geneva convention.. :D

Work with what you've got..

Rao

vallikranth
09-25-2007, 06:35 PM
:D
Thanks rao. Now Iam going to use tsop 1356. However I didn't get reply to my first question regarding the one which had very wide freq response. Can u explain that too. Also what does that 13 in tsop1356 stand for???

rao
09-26-2007, 09:46 AM
13 or 17 can be model no. batch number or design number.. I am not very sure..

go through the chart...in vikas's article about IR ranging sensing.. (search through the topics) That chart shows the range of frequencies vs the magnitude of operation(whatever that meant)..

Rao

tpsbpl
10-26-2007, 11:32 PM
see here
http://stuff.nekhbet.ro/wp-content/uploads/2006/07/tsop.JPG