Alternative for the H21LOB Opto

I have just started building a Prusa Mendel (have ordered almost all the parts!) and am now to the point where I need to buy the Optos. I have decided to go with the Gen6 electronics and cannot seem to find the H21LOB optos anywhere but mendel-parts.com. According the Mouser and Digikey, this part is now obsolete.

I was wondering if anyone knew of any alternatives to this that are compatible with the Gen6 design (and firmware) so I do not need to change any schematics or code? Has anyone else run into this problem?

I saw that the TCST2103 should be compatible but the wiring would need to be different. I cant find any documentation showing how the wiring would need to be done.

Thanks for any help!

Edited 1 time(s). Last edit at 03/21/2011 11:05PM by NJC.

Here are instructions on how to tweak the Gen3 Endstop, should work for the TCST2103 as well: [reprap.org]

Gen6 has endstop electronics on the main board, so you'll have to apply your Dremel there.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Thanks for the link! Earlier this morning I actually found that the Gen6 firmware has a version specifically for the TCST2103, so I think it will work just fine.

The H21LOB is available just fine from ebay VV

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reprapworld.com
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Hi see my other thread Hope it helps