Time delay off relay design

[mb107]

The Arduino is a PWM fan control for a large 600W fan. So you have to run the Arduino to run the fan.

You can read about the fan control here.

First PCB Critique Rev 1

the "ripup" command has several forms: ripup ; tears up all the routed tracks. (or click "ripup" followed by the traffic light.) ripup signalName tears up a single signal. ripup (click on trace) tears up the individual segment of the trace. Click on an airwire that is part of a signal, and it tears up the signal between nodes. ripup (click on polygon border) un-fills the polygon. BTW: EAGLE has an "undo" command that works really well, and will save you from a lot of mistakes. It's a …