I am using a Hikvision DS-HD1 doorbell camera, I wanted it to sound a 12V buzzer in our loading dock. If you're like me and don't know anything about low voltage, Youtube isn't much help. Here are some useful points I would like to know: with a 16V (AC) transformer. This AC-DC stuff is immediately confusing. Second, you need two power supplies: I used a 24V AC transformer to power the doorbell camera and open/close the relay contact. I used a 16v AC transformer to complete the buzzer circuit…