This 12V stepper motor controller was found in the August 1996 Electronics Now magazine. The circuit has a pulse input and the MOSFETs can be of virtually any type.
This circuit, from a 1999 publication, uses an improvised optical coupler with LED or...
This reducer was found in documentation from the 1980s, using transistors of the time. The higher...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...