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Dt38 921

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hello i bought one of these http://www.allelectronics.com/cgi-bin/category.cgi?item=IR-13&type=
and the ir reciever it has has a part number DT38 921 on it and i need a datasheet to find out if i can use it for my projest or if i need to replace it  it is in a square metal package and  has a black dot on the front witch is the ir reciving part it has 3 leads and  is used it the myestery ir reciever i want to know if it will pick up only a certan frequency like 38khz witch the partnumber implyes and what it does with what it recieves and of cource the things liek what voltage it works at and etc. please find this for me thanks

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