At 07:26 PM 10/22/08, you wrote: >Hi,after I just e-mailed you I got thinking,my friend wants to hook >up the old bag phone to the "head".You guys in this club are much >more knowledgable on the old stuff than he is so I figured I would >ask if this is the best way to do it. > >What would you advise ? I would put in a whole unit if it's easier >but I don't know how to hook it up to the modern cell networks.The >bag idea is just what we were thinking was the easiest,any advice >would be great,Greg.
Check this out... <http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=51&page=> Take their set of parts, isolate and tap onto the hookswitch and dial contacts from the telephone head you have, and run with it. You'll need to build a voltage regulator circuit that will take the +12 to +14 from the vehicle battery and knock it down to 3.6 to 3.7v at 2a but there are a number of regulators that will do that. Personally, I'd use a switching supply for that. Or if you want to just buy a working portable rotary phone you can buy one ready to go for $300 Mike WA6ILQ
