Raspberry 8CH Relay Powerboard
Support for 5V controlled Relays by 3.3V GPIO Not yet tested!
Mass Filled Board - function not confirmed yet.
planned to use for Raspberry and SainSmart 8 Channel Relay:
http://www.amazon.de/Kanal-Relay-Relais-Module-Arduino/dp/B00AEIDWXK/ref=sr_1_3?ie=UTF8&qid=1448393061&sr=8-3&keywords=relay#productDetails