ddzheng – The Salted Fish

Roland SR-JV80 Re-writable ROM Card with ESP32

January 28, 2025February 13, 2025 by ddzheng

For user manual and purchasing please visit: https://www.ddzheng.cc/?page_id=666 Update 13 Feb. 2025: The first batch run has finished. This will be also PVT. change to reverse mounted 1206 led on bottom side. Update 29 Jan 2025: Out of advice from Gearspace user I will add a header footprint for remote mounted button. I added ability ... Read More

Roland XP-80 LCD Replacement

December 30, 2024 by ddzheng

Final modification for my XP-80, and you can do this as well

Korg Triton Repair and Restoration

November 17, 2024December 20, 2024 by ddzheng

A long time viewer of my Bilibili channel contacted me to do a restoration of his Korg Triton.

Tektronix DPO71254B Repair

September 11, 2024February 6, 2025 by ddzheng

There is a DPO71254B at my workplace that has been abandoned for quite a while. I repaired it so that we can use it to debug (no cal though)

Roland D-50 Repair

December 31, 2023February 6, 2025 by ddzheng

The long journey of restoring a Roland D-50

Oscilloscope Measurement Artifacts 1

December 20, 2023December 21, 2023 by ddzheng

In this article I present some aspects that distort electrical signal measurement result, with focus on what happens in the scope itself after the signal has entered an oscilloscope.