Help please. Dip switches and mach 3 settings

[john swift]

does it still make a noise if you remover the jumper to disable the relay ?
(I can't think of anything other than the relay that could make a noise)

having a quick look at the data sheet for the LM317 regulator
the 12 to 24V DC supply needs to be a minimum of 13.5V

the supply goes via a diode that drops about 0.6V and the LM317 regulator should have an input that's at least 3V more than the 10V output

is the 12V supply regulated ? or is it unregulated and is more than 12V if lightly loaded

for your initial tests you can disconnect the connection to the stepper driver enable

John


PS

a simple input tester I used to test a similar BOB without using a PC (or motion controller)