Make Old Landline Phone RING

Get ten 100x100mm one or two layer high quality PCBs for just $5 plus shipping from sponsor of this video, @PCBWay : www.pcbway.com
Arduino based Phone Ringer circuit that makes old phone ring, until someone picks up.
DO NOT CONNECT THIS TO PHONE LINE / LANDLINE. THIS IS MADE FOR PHONE THAT IS NOT CONNECTED TO ANYTHING ELSE!
Old phones like this one aren't really useful anymore, when it comes to calling someone. Landlines have been disconnected in many places.
Nostalgic feeling, recognizable shape and sound and very visible way of using them (actually picking up, dialing numbers) makes them still good props for theater, toys for kids and home decor for people collecting old things.
I wanted to make this one actually do something, so I created a ringer circuit that turns the ringing off once someone "answers the phone". This could be used as a ringer for doorbell, alarm clock, kitchen timer or anything else one can imagine.
PCBs shown during PCBWAY section:
CH551G prototyping board:
www.pcbway.com/project/sharep...
CH551G based AVR programmer:
www.pcbway.com/project/sharep...
Microphone preamp:
www.pcbway.com/project/sharep...
Custom protoyping board with two regulator options:
www.pcbway.com/project/sharep...
0:00 Popular phone in 90's, still useful?
0:24 Ringer circuit intro
0:49 PCBWAY
1:08 Phones are simple, reading off-/on-hook
1:33 Ringer voltage and frequency
1:46 inverter (Ring voltage generator)
3:08 Ringing sequence
3:38 Detect when someone answers
5:01 How this will be used?
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[@Hackvlog]

Schematic is seen at 4:45. Based on simulation and my limited real world testing, this should work fine. If anyone thinks otherwise, please leave a comment!
I was able to find project descriptions where people have made the phone ring OR read the hook, but not a single one that does both without modifying the phone's internals.

[@thesidd19]

Thanks

[@t1d100]

A fun and well done project. Bravo. Occasionally, you will also find a phone system controller box, at the thrift stores, as well. I forget the proper name for the device, but its functions were things like adding a "hold" line, directing a call to a particular extension, tying in the on-hold music system, etc. I wonder, if one of these boxes might be helpful?

[@Hackvlog]

Thanks! That sounds interesting device. Imagine having an intercom system at home (like Thomas Burns made in one of his videos) and being able to play on-hold music to the other person!

[@0ctoEyes]

I'd be really interested in getting one of these for a project I'm working on. Is the PCB available?

[@argentinomacrifuevidaltamb3772]

Disculpa pero esta mal tu circuito, el transformador debería ser de 600 Ω 1x1 = 600X600 Ω para acondicional la impedancia. Cualquier impedancia o capacitancia diferente el proveedor te retiene la linea.

[@Hackvlog]

Thank you for the feedback. I would agree with that, if we were connecting something to an actual landline / phone line that goes out to the exchange. But I don't know if ringer circuits should be used in that situation. Anyway, this circuit is used with phone that IS NOT connected to anything, other than this circuit... An isolated system. I should have mentioned that more clearly in the video.