Amateur radio is my hobby however I have no circuits that I can post. Your request is not very specific - that might explain the lack of response. I also understand that you might not know where to begin when asking a question - I have the same problem at times. You might surf amateur radio sites as a place to begin. The American Radio Relay League (ARRL) might be one place to look. I hope this gives you a start. If you can be more specific about what you intend to do with it maybe someone has what you need.