Path: utzoo!attcan!uunet!wuarchive!emory!att!bu.edu!purdue!mentor.cc.purdue.edu!lairdkb
From: lairdkb@mentor.cc.purdue.edu (Kyler Laird)
Newsgroups: sci.electronics
Subject: Generating Telephone Ring Signal - My Solution
Message-ID: <16173@mentor.cc.purdue.edu>
Date: 6 Nov 90 17:03:03 GMT
Reply-To: lairdkb@mentor.cc.purdue.edu (Kyler Laird)
Organization: Purdue University
Lines: 18

Thanks for all the ideas on generating a ring signal.

I tried (in this order):
	a (motor-type) static vibrator
	555 -> DPDT relay
	555 -> 2 Power Transistors

Amazingly, all of these worked - even drove two phones with no problems.  HaHa
not yet tested on mechanical phones.  (I don't have any handy.)

I settled on the solid state solution for obvious (well,  ifor those of you who
have heard a static vibrator) reasons.  I just hacked it up as I went along -
I've never even used a discrete transistor before.

Well, it was fun.  Now I'm trying to get more of the system done (DTMF recv. &
phone line routing).  If anyone wants more info on my circuit, contact me.

--kyler