Hello together, this is my first post i hope i dont do something wrong
Warning, Noob question ahead!
I'm planning to control my front door with an ESP8266. To do this I want to switch the door buzzer from my intercom (HT611-01) via a relay.
The ESP and relay should be powered directly from the intercom (to avoid a battery, external power source). The problem is, the intercom only offers 14V AC.
Is it possible to power the ESP + Relay with a full bridge rectifier and an adjustable DC/DC converter? Do I need a smoothing cap? If so, how big should it be?
Will I face problems powering the relay or running my circuit in parallel? (too high current, voltage dips, etc...)
Is there an easier solution?