CH341A Programmer
Early versions, prior to version 1.7, of the cheap and popular CH341A mini programmer have a nasty bug where the voltage levels on the data lines remain at 5V even though the programmer is jumpered to 3.3V.
@ddemos1963 came up with an interesting hack to solve the problem in an efficient and artistic way.
Here's what you need to do.
Sever the connection between the 5V power line and the CH341A chip. Use a sharp utility knife to cut the trace on the backside of the programmer board.
Connect the 3.3V output leg of the voltage regulator to pin 9 of the CH341A IC by bridging it to a corresponding trace at the capacitor located nearby.
Restore power to the chip by re-routing the 3.3V voltage from the 3v3 pin to pin 28 of the CH341A IC through the 5V pin connector on the header.
