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PICStep project from fromorbit

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gaga2410

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Hi everyone,

I plan to built 3 picstep controller, the interface output board and the daughter input board.

I have problem with part list for the interfaces board. There are no value for the TBA resistor.
Are these special resistors ? Maybe TBA is a abbreviation ?

I've attached schematic for the output board.

Thank you for your help !
 

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