WOW I thought that this would be a dead post when I uploaded the manual and the diagram was more than 3 years old without any response, well guys, my English is not very good, uncle google help me, I had that microphone a long time, I lost the year when I buy it I think that in the 90s I do not remember. in a radio shack store in my city, there was only a few years and it was closed, the microphone was so good, that in a couple of times I copied the circuit for 2 friends and put them in their cobra 148GTL and general electric 3-5825a ( excellent radio) the battery was hard to find, a photography store helped a few years with the battery, then I put a 9v battery, and that increase in voltage, gave rise to amplification increase, as we were CB nothing purists we loved the amplifier noise, those were good morning, the thing is that it was not coincidence that the scheme went live in a country that is now fashionable in the news, VENEZUELA, my family and I have months, picking up selling and giving away the things of our Since we must migrate to another country due to the dictatorship that was established in the country, so a whole life does not fit into a suitcase, so I decided to scan all my personal documents, and especially the manuals and agramas that I treasured during my 50 years of life, before scanning review in google if I can find it, to avoid work and this is one that happily was not found in my searches on the web and decided to upload it to this post, I hope you can give good use, greetings and good DX