Hi... I have the same problem... I have bought 2 FB... Both of them made my relays click.. I have try with different power supplyes..12VDC...2A..5A, an same problem with both,,, I habe bought 2 diferent relays... the one you sell in mP3 car..25A 12VDC coil...and ones that I bought here in Chile... 7A 12VDC coil 50mA trigger..
In both I have a lot of noice and they are not stable..
Theres a Solution??? theres a special kind of relay to buy??? Please helpme..
Sorry about my english...