How to add a loud speaker to (the most basic) landline phone? Answered
How would you connect a loudspeaker to a basic landline phone (so several people can hear the conversation)? (Basic phones don't have loudspeakers, only the one handling the headset can hear).
The loudspeaker doesn't have to be super loud, it could be like the ones powered by USB on computers, or much smaller, as far as we could hear the conversation.
It's not that easy since theses phone are merely powered by the little current inside the landline phone line. So I guess I need another power source, like a USB charger, and maybe to amplify the sound signal, to use the loudspeaker. I started to learn electronics for a few months, but I have no idea how to handle this problem. Any advice would be great!
Thanks for your help!