Making a 1940's telephone bell work using WiFi and a Ring doorbell

Small project where I try and get a 'bought on a whim' antique telephone repeater bell to work with a Sonoff SV WiFi module so that it can be used as a doorbell in my garage to tell me when someone is at my front door, because I often leave my phone on silent and miss it! It was a bit more complicated that I first thought.
Parts:
GPO Bell 1a
BT Ringing Generator 2A
Sonoff SV module modified to separate contacts from the input voltage.

[@andrewmiller2868]

I've only just found your channel Jack and I think the way you talk through your process is really easy to follow. I find it fascinating to watch people solving problems, their thought process and their reasons for doing it even if it goes wrong 👍👍👍.

[@jacksgarageworkshop]

I’d rather include my mistakes too, helps people see where they might go wrong or why I’ve ended up doing something the way I have. I was convinced that ringing generator was all I needed!

[@dalemettee1147]

Jack, back in the dqay, This unit was called a bell box. From back in the '30's and '40's, it was connected to a circuit with a desk telephone set that had no bells of its own. It was quite loud when it rang.

[@jacksgarageworkshop]

Oh ok, I figured it was an extension or repeater bell rather than the ‘only’ bell for a telephone. Interesting!

[@jeffkeogh5616]

Love it, I was searching around to make my bell work and figure out the voltage supply, the WiFi aspect is extra unexpected info though.

[@jacksgarageworkshop]

Hey thanks, glad it helped out, thanks for watching!

[@rodfulford4306]

You dont need the 3.3 k resistor which is only needed if connected to a plug and socket telephone line to match the 4k impedance of the phones

[@Nicholasbirdvowles]

Hi what voltage do you need for these bells

[@jacksgarageworkshop]

70v 25hz

[@AllTheFasteners]

They have a resistance of about 1kOhms and you can drive them from as low as about 24VAC. Frequency is up to you really. You can use a bipolar stepper driver to generate a signal.