Ever need to power on a device when your computer is on?

I'll show you how to build a dirt cheap usb powered switch!  

This switch - which is actually a 5V powered relay with both normally open and normally closed contacts (NO+NC).

When the PC is turned on, 5V power is available at the usb port - activating the opto isolated relay.

Note - there is no software or driver needed. This relay is driven only by the usb 5V supply and can not be activated using software.

Daisy chain multiple relay PCBs for etc switching!

The relay itself is good for 10A/250Vac or up to 10A/30Vdc