i need to modify a little on original pcb. this is PADS pcb Software.
There are only a few PCB changes. 1. Add DIP Switch. In a previous version there was a SIP alongside the DIP, but we dont need that extra 8-pin connector. 2. Delete J7. 3. On each driver channel, disconnect the pullup resistor from 3.3V and tie instead to the PWM signal. I made a sketch here attached. This affects 6 resistors, R6 through R39. This change will also improve the ground plane continuity. 4. Eliminate U12 and connect the 3V nodes to regulator on page 1. At the same time, change U6 to a 3-terminal 3.3V regulator,
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Dear Sir, I'm new to freelancer, but can help with your project, it doesn't look too complex. Will do this fast, with a good quality and maybe can make small review of your board if needed. Contact me if interested.