Adu's Electronic Lab For Hobby

  This is an open HW project, the target is to build up a low cost high precise voltage meter with 6.5 digital resolution, and ± 50V input range. It has the capability to be controlled by the upper level control system and has a VFD display that can make it work independently.     This series of articles will be divided into at least 3 parts: Part 1: Schematic and working principle introduction. https://aduecho.blogspot.com/2021/05/hw-open-source-65-digital-voltage-meter.html Part2: HW debugging and bug fix. Part 3: Calibration and performance test. Part4: Temperature coefficient compensation (not sure whether it works or not)   DIY disclaimer In this DIY project you may need to use high voltage, electric soldering iron, etc. unfamiliarity with the tools and process can be dangerous. This project should be viewed as entertainment only. The author will not be held responsible for any injury due to the misuse or misunderstanding of this DIY project. It's pure