[Mike Betts]

Tom,

There motor drives for DC brushless motors which take 0-5V, 0-10V and/or 4-20mA inputs.

I had inquired with innovationfirst about an analog input (for a past project we were working on) and they had indicated that, yes, they could do it (OEM basis).

However, after I had a bit of time to think about it, I came to the conclusion that a digital interface would be more noise immune.

In the end, I went with a DC brushless motor with a conventional motor drive and 4-20 mA input. It was much more versatile for the rapidly changing requirements of that development effort.

Now, back to your issue... What's the size of your load? If it's small, a DC/DC converter "brick' with a variable output may do the trick. They have current limiting and everything...

Bottom line, the IF speed control is a pretty good package and I don't know of anyone who makes a 0-5V input AND you already know a lot about the IF controller. I would agree with Dr. J... a 555 timer is a piece of cake. You can buy them at any Radio Shack.

Mike