What part is used in this IR receiver?
You will want to investigate the following web page at Vishay.

http://www.vishay.com/ir-receiver-modules/repeater/

At that page there is a section that links you to IR Receivers that are designed for use in repeaters or IR learning applications.



The parts offered on the repeater page are specifically designed to operate at a 38kHz carrier frequency. The part number TSMP4138 looks to be closest to the package type that you are looking for.



From the part data sheet the internal block diagram looks like this:



From the same data sheet the recommended application circuit for a repeater is shown as: