driving RC servo

On a sunny day (Tue, 22 Dec 2015 13:18:55 -0800) it happened Bill Martin wrote in :

I have a 555 based RC servo tester. It works. No idea about the circuit diagram. Get one from ebay?

cheapest and simplest is a 16F690

Good grief. No shortage of choices, although a lot of them do look kind of the same! Just to try out the idea, there is no way I could build anything for those kind of prices. Thanks for the suggestion. Bill

A 555 works well, if you don't mind the resistance to pulse width curve being a bit nonlinear. There's ways to make it way more linear, at the cost of more parts. I have a circuit that I use to turn an RC servo into a position feedback (basically you gut out the motor, PCB and most of the gears, what you're left with is a useful position-measuring gizmo).

Send me an email and I'll send you a pdf of the schematic: tim at wescottdesign dot com.

Please learn to edit such URL's. The above is the same as: All I did was delete the tracking garbage. When you search twice for something on eBay, it conveniently adds the 2nd search string to the end of the previous search string. So, all I had to do was delete everything before the _nkw=xxxx.

Googling for images: Looks like plenty of 555 servo controller circuits to choose from.