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Mach3 under Vista / Re: New setup for USB board by BSMCEO4U-PP Bitsensor
« on: January 09, 2021, 07:57:53 PM »
Sorry, I meant the two enable lines to the 'HC541 chip. The ULN2003 doesn't have any.
Which brings up another design error. The HC541 input logic levels are really not compatible with 3.3V driving logic. The HCT541 would have been the right choice, but the part on my board is clearly marked <abunchofcharacters>HC541, with a TI logo. The step and direction signals are coming out, though, so that part is working.
Mike
Ref: Bitsensor BSMCE04U USB board
Which brings up another design error. The HC541 input logic levels are really not compatible with 3.3V driving logic. The HCT541 would have been the right choice, but the part on my board is clearly marked <abunchofcharacters>HC541, with a TI logo. The step and direction signals are coming out, though, so that part is working.
Mike
Ref: Bitsensor BSMCE04U USB board