Help! DIY 4 amp L297/6203 driver

[Ross77]

Ok so heres the final draft..........

The only thing I cant work out out is what the diodes (D9,D10) for the shunt reg need to be? Any over obvious problems?

Once its all confirmed and if anyone is interested I can post the eagle files.

[irving2008]

Ok so heres the final draft..........

The only thing I cant work out out is what the diodes (D9,D10) for the shunt reg need to be? Any over obvious problems?

Once its all confirmed and if anyone is interested I can post the eagle files.

they are zener diodes. You need a total voltage of Vclamp - 1.4. By using 2 diodes you can get a bit more fine tuning of the voltage, for example a 30v and a 7.5would give a clamp of 30 + 7.5 + 1.4 = 38.9 which would be good for a 36v supply on 40V drivers...