[CAD_CAM_EDM_DRO] variable V power supply

Hello Friends,
In relation to this topic I have a question.
Where can I get for laboratory use cheap Voltage and/or
pulse width regulators? Or How can I build them?
I have a PLC that has 4 analog outputs 0 to 10 VDC and I want to
use them for governing resistance's or ordinary motors up to 1 hp.
The units need not to be very precise, the PLC takes care of deviations.
Any input will be greatly welcome because my project stands still
without these units.
Thanks
Sven Peter