Here's an excellent collection of how-to articles:
http://www.repeater-builder.com/rbtip/
There are links there to controllers, both simple and quite complex. But that web site has pretty much anything you might want to know about repeaters, and the various pieces of hardware required to make one.
From some of your other posts, it's clear that you're not technically inclined, meaning you're an end user. I'd suggest you locate a resource that can build one up for you, rather than doing it yourself. Without the proper test equipment and knowledge, getting any type of repeater to operate properly, let alone legally, can be challenging.
Be aware that not all mobile radios can (or should) be turned into a repeater. Some have transmitters that are simply too noisy to allow a receiver to co-exist nearby. Many are incapable of being keyed up in the duty cycles that repeaters see without over heating. Many have receivers that are incapable of coexisting even next to a clean transmitter without having problems.