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Apr 24, 2015

How a Dial Phone Works (1/2)

Part 1: General

Since using all my early life dial phones but never actually studied how do the work .. now it is the time. In this article I open a LM Ericsson rotary telephone and figure out how it works and how does the automatic central connect the caller to called.

A dial phone opened with its basic parts visible: base plat, PCB (Printed Circuit Board), ringer, dial plate, cover, handset with microphone and receiver capsules in it, plug and cables.