Here are some of my homebrew project since 2007. All those project are bacisly i copyright for Elmers which they published at their own web.
1. Field Strenght Meter
This Field Strength Meter has been specially designed for our FM bugs. It is capable of detecting very low power transmitters and will assist enormously in peaking many of our FM transmitters that have a coil in the output stage that can be adjusted for optimum output.
Here are the result...finaly i made up myself.