David Nebenzahl wrote:
On 8/3/2009 9:11 PM spake thus:

On Sun, 2 Aug 2009 10:01:23 -0700 (PDT), "
wrote:

All the packages ive looked at in the store mention 115 v. , but
none mention 12 vdc. Please advise. Thanks.

I used one of these on a 1/4 hp motor.
http://www.bakatronics.com/shop/item.aspx?itemid=581

Looks to me like it uses PWM (pulse-width modulation), basically
"chopped" DC with variable duty cycle. Just curious: what kind of 1/4 hp
motor? Must be a 12 or 24 vdc one, obviously.

That's what it is. It give much much more torque at low speeds vs
lowering the voltage. I think that one also allows you to vary the
frequency of the PWM, but I'm not sure why you would want to do that?

Tony