So, what is this? This is an external stepper driver board for X and Y stepper motors of the original Prusa MK2/MK2S/MK2.5/MK2.5S printers. It allows usage of TMC2100/TMC2208/TMC2209 drivers (Silent Step Stick and similar, (TMC2209 are recommended), so your printer will become a lot quieter and much smoother due to the 256 step interpolation (same as on the MK3). This is the latest upgraded version 2.4.1 of the board.
More info here:
https://vmod.wordpress.com/prusa-mk2s-ext-driver-board-v2-3/
BOM:
1 x wire-to-board header 3 POS 2.54MM(.100) (https://www.digikey.be/en/products/detail/cvilux-usa/CI3103P1V00-NH/13177511)
2 x 100uF 35V Capacitors (https://www.digikey.be/en/products/detail/rubycon/35ZLH100MEFC6-3X11/3134256)
2 x 10k through hole resistors (https://www.digikey.be/en/products/detail/stackpole-electronics-inc/RNF14BTE10K0/1682687)
1 x 2 way terminal block (https://www.tme.eu/en/details/dg306-5.0-2p12/pcb-terminal-blocks/degson-electronics/dg306-5-0-02p-12-00a-h/)
1 x right angle 2.54mm pin header 2x4 pins (https://jlcpcb.com/partdetail/Cvilux-CH81802H200/C918394)
2 x right angle dupont 1x4 MX2.54 TJC8 housing (https://vi.aliexpress.com/item/1005004362274135.html?gatewayAdapt=glo2vnm)
4 x driver header 1x8 2.54mm (https://grobotronics.com/pin-header-1x8-female-2.54mm.html?sl=en)
1 x IDC connector 2x4 wire-to-board connector (https://www.digikey.com/en/products/detail/cvilux-usa/CA2308PA10Z/15519128)
10-15cm short flat ribbon cable (https://www.digikey.com/en/products/detail/assmann-wsw-components/AWG28-16-G-300/655756)