1. Have the phone relay unlock for 5 seconds or so, and simply series power to the lock thru the relay on the phone switch. You would need a simple plug in supply, ac or dc, and a lock.
Jim, I would not ever recommend that you use the internal phone system relay to switch the strike directly. Always use an external relay or timer relay. If the strike was to short out, you could risk burning out the KSU's relay or circuit trace. It is much cheaper to replace an external relay!
. If you have an electric strike that buzzes when unlock it is in the wrong application, typically a DC strike fed with AC and the hum you hear is the solenoid vibrating in the lock housing, which will lead to a decreased lifespan and can lead to heat problems if installed in a wood door.
Umm, no. Most strikes are designed to do this on purpose. Yes they buzz due to the AC on the coil, but that is the reason for using AC. Check out
this link to one of Rutherford strike's spec sheet, the buzz is listed right there as one of the features.
I think the buzz is something a lot of installers overlook. Nothing worse than standing there not realizing the door is being energized and unlocked for you. The buzz gives you that added confirmation.
The disadvantage to the AC strike is that they are never continuous duty. If you require a period where the door has to be unlocked for some time, you will either require a DC strike with some sort of access control system/bypass switch or simply get the locksmith to install a key latch that you can lock open.
