On Fri, Mar 14, 2025 at 05:07 PM, Zhenxing Han N6HAN wrote:
if we use a potentiometer, we can effectively make QMX’s output power adjustable
I'm not so sure about that.
The QMX does not like the supply voltage changing while it's running.
Mine rebooted when I tried it.
And the Rev 1 models would blow up (before Hans swapped the tantalums for ones with higher voltage rating).
The SMPS have to track the changing input voltage and adapt quickly to produce steady supply voltages for the microcontroller, etc.
There is a long thread on this topic from the QMX rev 1 era.
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73, Mike KK7ER
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