Help! DIY 4 amp L297/6203 driver

[tribbles]

Unfortunately, without the code for the PIC, it'll be effectively useless - it would be possible to write something, but it would probably need a bit of tweaking to get it right.

I'd be tempted not to use it at all and see how you get on. The motors would get hotter because the power will be on all the time.

I like Eagle, but I got fed up of the small board size (which is their aim, I suppose), so I bought the professional edition in the end - which also gives multi-sheet schematic entry as well. I did manage to make a board wider than the maximum size, but I had to use vias for PTH pads, and be really careful about the positioning of the other components.

I'm just having a discussion with Farnell (who bought CadSoft) about getting the autorouting package for it as well (I only got Layout and Schematic, but now I want to get the complete package).

[irving2008]

Shouldn't be too hard to create the same effect without the PIC. I see a monostable to define the timeout, and an astable with variable on/off ratio to provide a modulating switch. Could be done with the two halves of a 556 I reckon...

Then again, why not just pull Vref down rather than modulate it?

I will think on it...