DIY Power Supply Upgrade: M8 V7 Circuit Mod with VFD Display

If you've encountered persistent display issues with your long-utilized DIY M8 V7 power supply, the culprit may be traced to the 10K potentiometer responsible for contrast adjustment. These adjustable resistors are prone to malfunction even after replacement, prompting a practical solution: transitioning to a 12864 VFD display from the problematic 1604 display.

Maintaining a purely linear configuration in the adjustable power supply section, the digital board benefits from a switching power supply. Addressing the high display current of the VFD, a dedicated power supply was engineered by modifying a mobile phone charger board. Notably, a switch from the STC 12C56S2 to the 15W408AS rectifies character loss issues attributed to inadequate speed.

Explore the documented process images below.

l Normal working and settings interfaces.

l Modifications made to the original panel for resourceful adaptation.

l Comprehensive testing results, acknowledging the average appearance of the meter but ensuring a calibrated voltage range.

Accompanying these details is a revealing internal view post-modifications, showcasing the meticulous integration of components. 

Witness the final placement in its operational context, capturing the transformation into a seamless and efficient system.

For a clearer visual representation, a meticulously hand-drawn circuit diagram is provided, encapsulating the technical intricacies of the project. 

This comprehensive narrative not only communicates the resolution of technical issues but also emphasizes the ingenuity and adaptability demonstrated throughout the improvement process.