controlling ink jet printer

I want to control a dc and stepper motor with photo interrupters on an ink jet printer. The power out is 5 and 42vdc. How do I power the Arduino board and motors from this source without a meltdown?

Hello frankcalzia,

It´s usually done this way:

http://www.ecs.umass.edu/ece/m5/tutorials/tip122_transistor_tutorial.html

Hope it helps,

Rodrigo

Thank you very much. Saves my hardware!