I wouldn't use the NJM either based on current ratings. I do intend to get some L297 and L298's very soon though to test with a 4 amp Nema 23 Stepper. I have built my own drivers with mosfets that are nice as well, using a mosfet driver:
I didn't notice yet how to limit current with the L297.
For all the wasted time on this forum due to steppers and Hbridges, you'd think there would be one sticky that had a few viable options and schematics with working solutions for all levels of users. I have spent a LOT of time sorting this stuff out, when, if you know what to do, it is very simple. Problem is boiling it down to the few good options. Google can be good, but in the case of Hbridges, it's wild goose chase, or some other worthy analogy.
You know...
I had the same problem (didn't wire Vcc) with SN754410's (10 @ $1.83 ea) when I wired my first one! I think it has to do with a mental block--needing +5V when you've got +18V already wired to the chip.
Comments
Where are you getting them for that price?
You're obviously not familiar with this wonderful little search engine:
http://www.findchips.com/
Enjoy!
Regards,
Bruce Bates
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http://www.irf.com/product-info/datasheets/data/ir2184.pdf
I didn't notice yet how to limit current with the L297.
For all the wasted time on this forum due to steppers and Hbridges, you'd think there would be one sticky that had a few viable options and schematics with working solutions for all levels of users. I have spent a LOT of time sorting this stuff out, when, if you know what to do, it is very simple. Problem is boiling it down to the few good options. Google can be good, but in the case of Hbridges, it's wild goose chase, or some other worthy analogy.
I had the same problem (didn't wire Vcc) with SN754410's (10 @ $1.83 ea) when I wired my first one! I think it has to do with a mental block--needing +5V when you've got +18V already wired to the chip.
Mark