This feels risky, because if there’s any error with the transmission of the Off command, the door could remain unlocked indefinitely. The 4-wire unit station is pretty simple as well. Lots of customers ask us "how can I reverse the latch on my Yale lock?" Door Intercom Station with Bell Button Troubleshooting I have a Broan Music Intercom Model# K1172. Could you specify what kind of capacitor you used? The unit “intercom stations” can be either 5-wire, 4-wire, or 3-wire, (I think I just figured out why they called it PK “543”) each has slightly different hookups for sending audio and door unlock signals. You can find some spec sheets for it, but nothing that actually tells you what the components are. 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