12V DC Keypad to feed an 16-24V AC electric door strike?
Hi folks... I just realized my little project has a small snag -- two different voltages involved...
I bought a RFID Access control unit (a keypad-style device where you can swipe an Radio-Frequency ID tag near the reader to allow access into the building), and I hoped to run an electric door strike from it. The door strike normally sits in the locked position, and when juice hits it, it moves a piece of metal out of the way (I assume via magnets) to permit the door's latch to clear the door strike so people can enter.
I think normally the door strikes would be operated directly by a doorbell transformer, getting the electric only when someone inside pushes the button to "buzz" someone in. Since this is for an unattended building, I needed the Access Control unit to decide when to "push the buzzer", when a proper RFID is presented to it.
The Access Control unit runs on 12VDC, and it says its Lock Relay is 12VDC, but the electric door strike said 16-24V, and I think it is AC.
How would I hook up the two? Seems like I'd need a second transformer??
Any instruction on what wires on the keypad need to be connected to the strike or the strike transformer, etc would be a help... I'm getting very confused, partially because of all the extra terminals in the diagram (for bell, ground, etc), and the butchered-English the pamphlet is written in isn't helping.
Thanks for any help or suggestions!