Just registered and am looking some advice re SSR. I have the sainsmart 8 channel relay at the minute and it works well.
Is there an equivalent Solid State Relay as I need one that will work silently?
http://www.sainsmart.com/8-channel-dc-5 ... logic.html
Silent relays are latching relays, they latch and turn off the coil, next time the coil is 'energised' the latch releases. So you only send a latch / unlatch command for about a second.
Large versions of this type are used in hospitals for lighting, the relay does all the hard switching but no coil noise or current usage.
Some info here >>> http://www.azatrax.com/latching-relay-circuits.html
http://www.eeweb.com/blog/extreme_circu ... hing-relay
This is a mechanical system not an electrical self hold circuit.
If in doubt please ask.