| Author |
Message |
Brian (Bigbusguy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 30, 2005 - 2:16 am: | |
Ok all you electronics guys and gals.
I want to take a simple home phone and make a two way intercom out of it I done care if the key pad work I can wire a seperate buzzer.
All I need is to power it so I can talk. I was told It needed some type of risitor type thing tieing the lines together and a power supply .
I just want to keep it simple with radio shack type stuff.
Thanks
Brian 4905 Klamaht Falls Oregon |
CoryDane RTSII
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 30, 2005 - 2:45 am: | |
search the web for telephone intercoms.
there are a couple out there, all they need is 12vdc. They use a piezo and a push-to-close switch for each phone.
I don't have the site handy but will try to find it. The search should get you there.
cd |
Tom Caffrey (Pvcces)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 30, 2005 - 2:53 am: | |
Brian, I think you might be able to get the whole deal from Radio Shack. Check their website. We've got one.
Tom Caffrey PD-4106-2576
Suncatcher |
John that newguy
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 30, 2005 - 3:20 am: | |
Give it up to 40 clean DC volts across the red/green leads
(positive to red) and you've got a talk circuit. |
Phil Dumpster
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 30, 2005 - 5:57 am: | |
And give it up to 100 or so volts of AC and the bell will ring. |
Brian Brown (Fishbowlbrian)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 30, 2005 - 12:10 pm: | |
The Search function is soooo valuable.
"telephone" netted this recent discussion:
http://www.busnut.com/bbs/messages/233/7006.html
FBB |
Adame
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 31, 2005 - 11:20 am: | |
I found a nifty old timey set on ebay. Lots of choices there. |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 31, 2005 - 5:11 pm: | |
or get a couple of baby monitors |
Abajaba
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 31, 2005 - 11:25 pm: | |
Put two telephones on a twisted pair. On that twisted pair is 25 volts DC. To make the phone ring, put 100 volt DC pulses on the line. At each end of the circuit there would be a button next to the phone. When one wished to call the other end of the line one would push the button a couple of times and then pick up the handset waiting for the person at the other end to pick up.
The two push buttons would be wired in parallel and both phones would ring at the same time but so what. At least that way one knows that they have pushed the button.
The 25 volts on the line would be to power the phones. The 100 volts is to make them ring. I will take a look at the phone line pulses soon with an oscilloscope to see what they look like when my house phone rings here. |
t gojenola
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 01, 2005 - 12:16 am: | |
Bryan:
Here's a page that tells you how to do it:
http://electronics.howstuffworks.com/telephone5.htm
However, if I felt the need for an intercom, I think I would just buy a simple cordless phone system with speakerphone at the base unit. All it would require is a power supply of some sort, and the intercom function would work independently of its built in phone line functions. I have one of these in my house and even with the phone line unplugged the intercom function works from within the house to within the bus - about 40' or so. The good thing is that these units are not very expensive, the remote unit would work as a walkie talkie outside the coach, and you could relocate the whole shebang into the house or shop - or wherever you need it.
tg |