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Phone ringing generator(UK) | PCB Design

Phone ringing generator(UK)
Version 1 - Last update: Oct 3, 2015

A ringing generator for connecting old dial (pulse) phones with bells. This ring tone is for UK ring. Circuit from VK6FH. Amalgam of circuits 1 and 2.


  1. Should be a 74C90.
  2. Regulator should be 5V not 12V. But not possible to get 5V device from bin with proper pins.
  3. Mosfet can be anything over 50V and 10 Amps.
  4. Output pin drives a mains transformer in reverse to generate ringing voltage. Connect pin to secondary of tx and other side to ground. Use primary as drive voltage.
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