Schematic for Duet inputs with 30 volt protection

[fcwilt]

Hi,

Does any have a diagram showing how the protected inputs on boards like the Mini 5, 6HC or 3HC are implemented?

Thanks.

Frederick

[dc42]

You can find the MB6HC schematic at https://github.com/Duet3D/Duet3-Mainboard-6HC/blob/master/Duet3_Mainboard_v1.01/Duet3_MB_Schematic_v1.01.pdf. The input protection is provided by a 10K series resistor followed by a Schottky diode to +3.3V.