Register to reply

Project: Old Phone Ringer

by abodell
Tags: phone, project, ringer
Share this thread:
abodell
#1
Jan12-12, 02:44 PM
P: 1
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!
Phys.Org News Partner Engineering news on Phys.org
Student develops filter for clean water around the world
Developing the next evolution in underwater communication
Compact vibration harvester power supply with highest efficiency opens door to "fix-and-forget" sensor nodes
Antiphon
#2
Jan12-12, 11:03 PM
P: 1,781
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.


Register to reply

Related Discussions
Resistivity of Ringer's solution Chemistry 2
Phone service does not work properly (phone and interet through telephone wire) Computing & Technology 3
Help for this final project-> Phone set for blind people Electrical Engineering 11