All it does is time the activation of the relays that control the gas flow, power, and wire feeder, so [Brett] decided to use an Arduino instead. The welders control circuit runs at 24V ...

the idea is that he can still use the Arduino to reprogram the NVRAM chip when he wants to play around with the sound. We’ve covered some pretty fancy circuit bent instruments here in the past ...

These devices have key drawbacks. Water level indicators require manual pump operation and often waste power as multiple LEDs ...