I was going to build a headphone amp that would kill the volume and possibly add a ring tone when my phone rings. I needed it if I wanted to wear headphones in my cubical, and frankly I’m pretty surprised more folks don’t have the same problem.
I was considering a number of ways to implement the design, when I stumbled across a simple solution at www.allelectronics.com. Search for part # PA-37, telephone lamp flasher. It is a simple device designed to let the hearing impaired know when their phone is ringing. It will turn a 120 volt device on and off when the ring signal is detected. It currently sells for approximately $9.50 plus shipping. What I did was to pick up a 3 volt wall wart transformer and a vibrating motor from the same source (couple of bucks each). I took a few yards of doorbell wire (aren’t you glad I didn’t say speaker wire?) and soldered it between the transformer and the motor. I fit the motor in a small case (the cap of an old ball point pen) and clipped it to my shirt. Now I get a vibrating page every time my phone rings, so my ears are free to enjoy life’s finer things.
Folks who want to take a more DIY approach could probably yank the ringer out of an old phone and modify it to suit their needs, but I would be careful because 60 volts has a way of getting under your skin. This link should be helpful if you simply must roll your own:
http://www.hut.fi/Misc/Electronics/c...ne_ringer.html
I was considering a number of ways to implement the design, when I stumbled across a simple solution at www.allelectronics.com. Search for part # PA-37, telephone lamp flasher. It is a simple device designed to let the hearing impaired know when their phone is ringing. It will turn a 120 volt device on and off when the ring signal is detected. It currently sells for approximately $9.50 plus shipping. What I did was to pick up a 3 volt wall wart transformer and a vibrating motor from the same source (couple of bucks each). I took a few yards of doorbell wire (aren’t you glad I didn’t say speaker wire?) and soldered it between the transformer and the motor. I fit the motor in a small case (the cap of an old ball point pen) and clipped it to my shirt. Now I get a vibrating page every time my phone rings, so my ears are free to enjoy life’s finer things.
Folks who want to take a more DIY approach could probably yank the ringer out of an old phone and modify it to suit their needs, but I would be careful because 60 volts has a way of getting under your skin. This link should be helpful if you simply must roll your own:
http://www.hut.fi/Misc/Electronics/c...ne_ringer.html
