Can I Use an SCR Dimmer for My Old Phone Ringer Project?

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SUMMARY

The discussion centers on using an SCR dimmer to generate the required 80V at 20-25Hz for an old phone ringer project. A suggested solution involves utilizing a microprocessor, specifically the PIC16F684, to control the SCR dimmer by counting AC cycles and triggering the SCR every third cycle. This method allows for precise control of both voltage and frequency, effectively achieving the desired ringer specifications.

PREREQUISITES
  • Understanding of SCR dimmer functionality
  • Familiarity with microcontrollers, specifically PIC16F684
  • Basic knowledge of AC voltage and frequency manipulation
  • Experience with electronic circuit design
NEXT STEPS
  • Research SCR dimmer circuit design and implementation
  • Learn programming techniques for the PIC16F684 microcontroller
  • Study AC cycle counting methods for frequency control
  • Explore voltage regulation techniques for achieving 80V RMS
USEFUL FOR

Electronics hobbyists, circuit designers, and anyone interested in retrofitting old technology with modern electronic controls.

abodell
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Hello All, I am working on a project to get a old phone (from the 50's) to ring. The problem that I have is ringer voltage is 80V @ 20-25 Hrtz. I am trying to come up with a really cheap way to achieve this. I was thinking of getting a variac to set the voltage at 80V but I would still need a way to alter the frequency. Any help will be much appreciated!
 
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Get an SCR dimmer. Arrange it to be triggered by a microprocessor (like a 16F684) where it counts AC cycles and triggers on every third one. If you delay the trigger for the right length of time in the AC cycle you will get the 80 volts RMS too.
 

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