Daily Archives: 2025-07-29

Beware of Spindle Controller Ground

TL;DR: If you have one of those sketchy Chinese metal-cage 500W spindle speed controllers that uses a potentiometer for speed control, the potentiometer terminal block is probably referenced to a dangerous voltage, be careful what you connect to it and/or replace it with a less dangerous one.

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RP2350 A4, RP2354, and a New Hacking Challenge

Source: Hacker News

Article note: Ooh, they fixed the internal pulldown bug that has made 2035s kind of sketch to design with, made the IOs fully 5V tolerant, and introduced a variant with onboard Flash.
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