Classic Rotary Phones Forum

Telephone Switching => Strowger (Step by Step) Switching => Topic started by: xhausted110 on December 26, 2012, 10:58:59 AM

Title: my SxS demo
Post by: xhausted110 on December 26, 2012, 10:58:59 AM
so recently I decided to make a step demo, so here it is.
http://www.youtube.com/watch?v=TKjx6FApDMo

(http://imageshack.us/scaled/medium/823/ipod1004.jpg) (http://imageshack.us/photo/my-images/823/ipod1004.jpg/)
(http://imageshack.us/scaled/medium/546/ipod1003.jpg) (http://imageshack.us/photo/my-images/546/ipod1003.jpg/)
(http://imageshack.us/scaled/medium/690/ipod1002.jpg) (http://imageshack.us/photo/my-images/690/ipod1002.jpg/)
(http://imageshack.us/scaled/medium/846/ipod1001.jpg) (http://imageshack.us/photo/my-images/846/ipod1001.jpg/)
(http://imageshack.us/scaled/medium/811/ipod1005.jpg) (http://imageshack.us/photo/my-images/811/ipod1005.jpg/)

yes the contact on the bottom wiper of the connector is broken, I am getting a new connector anyway as the one I have is defective.  we have dial tone,busy, and fast busy hooked up. also an outside line is hooked up through my key system.
Title: Re: my SxS demo
Post by: AE_Collector on December 26, 2012, 12:24:30 PM
Havent seen a "new" SxS Demo project get underway for awhile now. Nice going. Did you just recently round up all of the material needed or have you had it for some time waiting to get at the project? Is it AE or WE equipment?

Replacement wipers must be relatively easy to locate aren't they?

Terry
Title: Re: my SxS demo
Post by: xhausted110 on December 26, 2012, 12:29:38 PM
yes, i have replacement wipers, but why replace the wiper when i am getting a whole new connector soon? it is both AE and WE.
Title: Re: my SxS demo
Post by: xhausted110 on January 01, 2013, 02:31:58 PM
update: rewired EVERYTHING! it's all going to go to a 110 block for jumpering ect.


Title: Re: my SxS demo
Post by: WesternElectricBen on January 05, 2013, 11:01:18 PM
Awsome, obviously I have seen your YT videos. Wink wink
Ben or RVI
Title: Re: my SxS demo
Post by: marty on March 28, 2013, 11:52:15 PM
Hi ;
What is the size of your Power Supply ?? How much voltage and at what amperage  ??
And which and how many units do you have that your power supply is supporting ??
I would love to see your schematic..
THANK YOU Marty
Title: Re: my SxS demo
Post by: DavePEI on March 29, 2013, 03:55:32 AM
Quote from: marty on March 28, 2013, 11:52:15 PM
Hi ;
What is the size of your Power Supply ?? How much voltage and at what amperage  ??
And which and how many units do you have that your power supply is supporting ??
I would love to see your schematic..
THANK YOU Marty
Hi Marty:

A Strowger demo of two or three switches theoretically should be able to operate with a 48 volt 2 or 3 amp supply. However, with my British Strowger switch, I discovered that with a 7 amp switching supply when the switches were activating, the voltage could fall under momentary load. To solve this, I put a huge 10,000UF electrolytic cap following the supply with a bleeder resistor across it to allow it to discharge when the power is turned off.

The theory behind this is when the supply momentarily falls out of regulation due to the strong switching transients, the electrolytic will even out the voltage fast enough until the regulation of the switching supply catches up milliseconds later by storing and supplying the 48v during peak demand. It wasn't that the supply couldn't supply the peak current or voltage required, but that it couldn't regulate it fast enough when a pulse occurred. I discovered this quite by accident when I observed the waveform of the output DC on an oscilloscope.

It made a world of difference, though current-wise the supply should have produced more way more current than needed. The problem was the switching transients when the relays pulsed - the supply couldn't react fast enough to regulation-wise to keep up to the transients. Doing so made a world of difference in how the switches functioned.

I wouldn't have had this problem had I used a conventional supply - it is just because it was a switching supply (and perhaps not overly well designed)  that I had this problem. The supply I used was designed for CNC purposes, and is physically quite small, saving space on the demo frame (and cost  if I remember correctly was about $45.00 to buy).

On my North American Strowger switch, I use a physically much larger 10 amp switching supply. Presumably it is better designed, as I never had this problem with it.

The moral of the story, is that if someone is experiencing difficulty witht he reliability of switches, have a peek at the output of the power supply on a scope while the switch operates!

Dave
Title: Re: my SxS demo
Post by: marty on March 29, 2013, 08:39:37 AM
Hi All;
One of the reasons I have asked is, as some of you may know, I have been Having a Load of trouble getting my own switch to work..
One of the possible reasons that has been proposed is that my Power Supply is too small.. Mine is a 52-58 Volt Supply at 1.5 Amps..
I have three units connected at the present, a LineFinder, a Selector, and a connector, along with 9 L&CO relays, and two other misc. relays..
Dave, Your addition of a Large Cap, intrigues me.. I'LL have to see what I have here..
THANK YOU Marty
Title: Re: my SxS demo
Post by: DavePEI on March 29, 2013, 09:13:40 AM
Hi Marty:

Yes, I had read that on the TCI list, and that is why I mentioned it. 1.5 amps should work ok, but will be marginal, as release can take much more. When the relays release, it will be quite marginal. If you can find a large cap with a high enough voltage rating, it should help even out the voltages some even when switches release. I think mine is rated at 70 volts, leaving some buffer from the 48 volts. I am pretty sure that your supply would work better with an Electrolytic across its output.

Some of the old large mainframe computers used such caps in their power supplies, and you should be able to find something suitable fairly easy. Remember, the highest capacitance you can, with at least 70 volt rating. The bleeder resistor should by 5 watts or more at a high enough resistance to bleed it slowly.

Dave

Quote from: marty on March 29, 2013, 08:39:37 AM
Hi All;
One of the reasons I have asked is, as some of you may know, I have been Having a Load of trouble getting my own switch to work..
One of the possible reasons that has been proposed is that my Power Supply is too small.. Mine is a 52-58 Volt Supply at 1.5 Amps..
I have three units connected at the present, a LineFinder, a Selector, and a connector, along with 9 L&CO relays, and two other misc. relays..
Dave, Your addition of a Large Cap, intrigues me.. I'LL have to see what I have here..
THANK YOU Marty
Title: Re: my SxS demo
Post by: marty on March 29, 2013, 11:09:55 AM
Hi All;
Dave, the Cap I found is a 5000 Mfd at 450 volts.. I found another one as well, but its voltage rating is too low, its 66000 Mfd, but only 30 VDC, So I can't use it..
THANK YOU Marty
Title: Re: my SxS demo
Post by: xhausted110 on March 29, 2013, 03:45:18 PM
marty, mine is 48 volts at 4 amps. it is an original western/lorain electric.
Title: Re: my SxS demo
Post by: marty on March 29, 2013, 06:15:34 PM
Hi Xhausted;
That is most likely what I need.. Where did You find Yours ??
Who is your supplier for SxS units ??
I would love to see more video's !!!
THANK YOU Marty
Title: Re: my SxS demo
Post by: xhausted110 on March 29, 2013, 06:39:58 PM
I get them from my friend Keith H. In Michigan. I have made a lot of progress since my last step video I will make another video soon.

-Evan
Title: Re: my SxS demo
Post by: AE_Collector on March 30, 2013, 12:18:40 AM
This ought to do it for you. I believe it is 50 Amps output. This is the power supply for a GTX400 (Hitachi) Crossbar PABX.

Bonus; Ringing, tones and interupters are all inside as well. It must weight 100 pounds though, how would you like me to ship it? :)

Terry
Title: Re: my SxS demo
Post by: marty on April 20, 2013, 01:11:25 PM
Hi Xhausted;
Have you made any progress on Your LineFinder ?? Since the last video.. My LineFinder did the same thing, and I found a wiring error.. I am after writing this posting going to try my Linefinder again, and after I do some more wiring with my L&CO relays to get all the correct levels set.. I will let You know IF I make any more progress..
THANK YOU Marty
Title: Re: my SxS demo
Post by: xhausted110 on April 20, 2013, 08:37:15 PM
I half fixed my the one with the problem, but I am currently using a loner from a friend.
Title: Re: my SxS demo
Post by: AE_Collector on April 20, 2013, 08:53:00 PM
Oh, power supply I assume you are talking about. For a moment I though these barely teenagers were loaning one another SxS Line-finders to test with and figured I had fallen asleep and woke up in 1945.

Terry
Title: Re: my SxS demo
Post by: marty on April 20, 2013, 08:58:00 PM
Hi Xhaused;
What was the Problem with your LineFinder ?? Was it a Bad LineFinder or something in the wiring, or something else ?? I am asking so all of us can benefit from your Experience, and what you found out..
THANK YOU Marty
Title: Re: my SxS demo
Post by: marty on April 20, 2013, 09:10:56 PM
Hi All;
I found two problems, one was a wiring error that I found about a week ago.. If I remember correctly, I had my colored wires mixed up, and had the Start Line for the LineFinder, that came from the L&CO relays, it was also going to my reset line on all of the units, Via the Release relay, coil.. I have since changed the color on the Release line, so that doesn't happen again.. And the other problem that I found today, after ohming things out.. Was that I had about a month or so back, taken the Wipers off of the LineFinder So I could clean the Contact Banks, and when I had put them back, I had accidently reversed the T and R wiper, with the S and RS wiper.. making it so the LineFinder would, climb vertically just fine, but, horizontally it would rotate accross all ten Contacts.. Not stopping at the proper one I had the phone attached to.. The LineFinder also needed an adjustment on its Rotary Stepping mechanism.. So it works now !!
THANK YOU Marty
Title: Re: my SxS demo
Post by: xhausted110 on April 20, 2013, 10:17:37 PM
Quote from: AE_Collector on April 20, 2013, 08:53:00 PM
Oh, power supply I assume you are talking about. For a moment I though these barely teenagers were loaning one another SxS Line-finders to test with and figured I had fallen asleep and woke up in 1945.

Terry

what?
Title: Re: my SxS demo
Post by: AE_Collector on April 20, 2013, 11:22:23 PM
Well you know, SxS is OLD technology that I am surprised that youngsters even have heard of let alone being interested in. I thought you meant that you had a Line Finder on loan from a friend (who would likely be in your age range) and that just sounded like the Twilight zone to me! Nothing bad intended buy it, all the more power to you guys!

Terry
Title: Re: my SxS demo
Post by: xhausted110 on April 21, 2013, 12:11:47 PM
an adult. 
Title: Re: my SxS demo
Post by: Weco355aman on December 25, 2013, 09:23:11 PM
Any updates from the newer switch people.
Title: Re: my SxS demo
Post by: xhausted110 on January 06, 2014, 03:37:34 PM
Quote from: Weco355aman on December 25, 2013, 09:23:11 PM
Any updates from the newer switch people.

haven't worked on it in quite a while, just need to find the time