Hantek DSO5000 series oscilloscope modification – reducing fan noise.
This simple modification, originally described by tinhead on the EEVBlog forum, is intended to make the built-in cooling fan quieter. A common issue with cooling fans is the noise they produce, and a typical solution is to reduce the voltage (and therefore the current) supplied to the fan, causing it to spin more slowly. The Hantek DSO5000-series oscilloscopes feature a three-terminal 12V voltage regulator dedicated to the fan (indicated by an arrow in the title image). To adjust the fan voltage, I simply need to replace the regulator labeled U7 on the power supply PCB.
