Make Old Landline Phone RING

Описание: Get ten 100x100mm one or two layer high quality PCBs for just $5 plus shipping from sponsor of this video, @PCBWay : https://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:
https://www.pcbway.com/project/sharep...
CH551G based AVR programmer:
https://www.pcbway.com/project/sharep...
Microphone preamp:
https://www.pcbway.com/project/sharep...
Custom protoyping board with two regulator options:
https://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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