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Roel Arits
Roel Arits vor 1 Stunde
Vishay TSOP38238, TSOP4838 might be a candidates for replacement. Someone pointed out a mistake in the schematic that the GND of the IR receiver was not connected. I will update the schematic to correct that mistake. So don't forget to connect the GND (ground) of the IR receiver, because otherwise it won't work anyways.  
Long range IR beam break detector
Roel Arits
Roel Arits vor 1 Stunde
I used the TL1838 because i had some available. I ordered them from Aliexpress, but there are some hobby electronics webshops in the Netherlands that still sell them.  I have choosen the burst on and off times of the transmitter so that any 38KHz IR receiver should be happy with the signal. You never have 100% guarantee, but it should work with other types as well because they will all have similar timing specifications.
Long range IR beam break detector
Roel Arits
Roel Arits vor 1 Stunde
Thanks for pointing that out. I forgot to draw the ground connection to pin 2 of the TL1838. Sorry for that. The TL1838 will not work without the ground connection at pin2. Sorry for that. I will update the schematic.
Long range IR beam break detector
Knulldulski
Knulldulski vor 4 Stunden
TL1838 seems to be an obsolete part. Non of the allmighty distributors (i.e. Farnell, Mouser, RS-Components, Digi-Key ...) have this part on stock. Is there a modern part that can be used as substitution? Much appreciate.
Long range IR beam break detector
-- Factum Books
-- Factum Books vor 18 Stunden
Looking at the last circuit diagram (the RX). Is it correct that the TL1838 is NOT connected to ground ?? - If yes, then 'how' can it function. A TL1838 clamps it output to Gnd or through an internal resistor to Vcc, and with no Gnd then ???
Long range IR beam break detector