Jeff Nading
Member
Why not use one of these drivers (Or similar.) and use an NE555 to generate the clock pulse. https://www.ebay.co.uk/itm/TB6560-3...tor-Drivers-/350922320630?hash=item51b499aaf6
To build one from scratch you need to build two H bridges and a PWM method of controlling the current through the winding. If you just build a driver were the current is only limited by the winding resistance then the maximum stepping rate will be very low due to the inductance of the windings limiting the rate of rise of the current with a small available drive voltage.
Hi Les, I'm not wanting to build a driver, or am I not understanding your meaning?