The 5 Transistor ESR as detailed on the EEVBlog forum.
I have created this project and made up a through hole version of the PCB as part of my Amateur Radio training / Exams.
Feel free to review / use this project. It is not my design that credit goes to Jay_Diddy_B over on the EEVBlog.
73 Paul M6KUR
# HOME PROJECT WEBPAGE #
# Version #
Just replaced 2x TL082 to 1x TL084... Added diode bridge on power supply.