Cerulean

It might be a exclusive danish product, but if you are looking for low cost relays for power use, these are a good bet.

What is it

• USB connector (goes in your PC)
• Male power plug (goes in a constant power supply)
• 4-5 female power sockets (when PC turn on the sockets go live)

Read more here Elsparefonden – AutoPowerOff aka Elspareskinne

How they work

Its a “stupid” relay construction. When the power of the PC is on, the +5V to the USB +5V pin a relay opens up the power to the female sockets.

How we abuse them..

Just give it +5V on the appropriate pin of the connector anyway you want and it will open.

Google usb pin connections – if you feel lucky

What price and Where to get them

You can get them in stores for around 10.00 €

To buy, search for “Elspareskinne” in shops like this

Or again, look for links in Elsparefonden

Keywords: autopoweroff, cheap, elsparefonden, elspareskinne, power, relay, usb