Introduce Ningbo Joiwo telephone working principle

Today we would like to introduce our telephone working principle.

The very simplest working telephone would look like this inside.

As you can see, it only contains three parts and they are all simple:

A switch to connect and disconnect the phone from the network - This switch is generally called the hook switch. It connects when you lift the handset.

A speaker - This is generally a little 50-cent, 8-ohm speaker of some sort.

A microphone - In the past, telephone microphones have been as simple as carbon granules compressed between two thin metal plates. Sound waves from your voice compress and decompress the granules, changing the resistance of the granules and modulating the current flowing through the microphone.

That's it! You can dial this simple phone by rapidly tapping the hook switch -- all telephone switches still recognize "pulse dialing." If you pick the phone up and rapidly tap the switch hook four times, the phone company's switch will understand that you have dialed a "4."

Ningbo Joiwo is specializing in telecom products for more than 17 years,we could provide clear analog/Voip/GSM communication in the various filed.

Are you looking for industrial telephone for any project ?

Ningbo Joiwo Explosionproof  warmly welcome your inquiry, with professional R&D and years of experienced engineers, we can also tailor our solution to meet your specific business needs.