Author Topic: My weekend endeavor  (Read 809 times)

Offline RB

  • ****
  • Posts: 476
My weekend endeavor
« on: October 24, 2017, 08:56:48 AM »
Wow, I hear crickets on this sight... :(
Was there a mass funeral I did not hear about??
Any way, this is what I did over the weekend.
I needed to get this555 cord set workin, so I can test/link my CB phones together.
Finally, with Trainmans help, I got it working and now have to house it.
The Station sockets needed a permanent home, so I boxed them up, and added quick connectors to my power supply.
They work, but when I built them, I went point to point with the connections.
What I have, is a temp short on the power supply when stuffin a plug into a jack.
The supply eats it, and starts right back up, so all is working.
I would like to eliminate the temp short when plugging, but it will take more time, and re designing the station jacks. A work in progress!
Has anyone ever delt with the station jacks directly?
I would like to know the order of switch activation, which  jack switch opens/closes first?  second? So I can make this right.
I know thats all it is, it will come!
The jacks use a 3 pole 2 throw 24v relay to make the changes.

Offline HarrySmith

  • Hero Member
  • *****
  • Posts: 4863
  • 1937 302
Re: My weekend endeavor
« Reply #1 on: October 24, 2017, 09:28:14 AM »
Not a lot of people here have intimate detailed knowledge about the switchboards circuits, myself included. This is probably why you have not had a lot of replies to these technical inquiries, I am sure you will get them as the experts check in.
« Last Edit: October 24, 2017, 12:56:31 PM by HarrySmith »
Harry Smith
ATCA 4434
TCI

"There is no try,
there is only
do or do not"

Offline RB

  • ****
  • Posts: 476
Re: My weekend endeavor
« Reply #2 on: October 24, 2017, 12:51:40 PM »
Yeah, I have gathered that... :)
Myself, I have extensive knowledge if component level work.
8 years at TRW doin reverse engineering to make schematics for products we worked on.
I know I will resolve the issues, just need to see one. or maybe, if I can find a description with pics of the Station jacks, that will show me what I need to do. :D

Offline paul-f

  • Hero Member
  • *****
  • Posts: 2956
    • Old Telephones as Entertainment!
Re: My weekend endeavor
« Reply #3 on: October 24, 2017, 06:40:07 PM »
A lot more collectors with switching expertise spend more time on the TCI Listserv.

You might find some reference documentation, including CDs and SDs, by searching in the TCI Library.
   http://www.telephonecollectors.info
Visit: paul-f.com         WE 500  Design_Line

.

Offline RB

  • ****
  • Posts: 476
Re: My weekend endeavor
« Reply #4 on: October 25, 2017, 09:18:20 AM »
Thanks Paul! I think I have most of whats available in the lib. been downloading bunches.
and always lookin for more.

Offline trainman

  • ****
  • Posts: 484
Re: My weekend endeavor
« Reply #5 on: October 27, 2017, 01:13:18 AM »
http://www.telephonecollectors.info/index.php/browse/bsps/by-division-number/doc_details/6241-032-511-107-i1

Jack number 275 is what was used in the 555 switchboard station line circuit.

Offline RB

  • ****
  • Posts: 476
Re: My weekend endeavor
« Reply #6 on: October 27, 2017, 10:17:26 AM »
Thank you Trainman, again!!!
a couple clicks, and there it is.
THAT is why I shop here :D
Happy Friday!

Offline trainman

  • ****
  • Posts: 484
Re: My weekend endeavor
« Reply #7 on: October 28, 2017, 01:40:22 AM »
Switchcraft 280 jack is close, but still not exact. Switchcraft 280 is is the same as WECO 280.

i have a feeling you might need to take parts of a few jacks and amke your own

Another thing I noticed when tracing out qires on one of my 555 cord units today. Pin 9 on the plug would be connected to frame ground. A couple circuits from both the CS and T relays end up at frame ground via Pin 9 through the switchboard wiring harness to frame ground.
« Last Edit: October 28, 2017, 08:32:47 AM by trainman »

Offline dsk

  • Hero Member
  • *****
  • Posts: 3409
Re: My weekend endeavor
« Reply #8 on: October 28, 2017, 05:55:54 AM »
 8) I have never touched a CB board, but if I should make myselves a simple one with just lamps or LED's as signals and as simple as possible I would have started with this sketch. Probably used an old laptop power instead of a battery.

Of-course the coils could be relays with contacts for audible signals... but simple is a great start.
So the jack has one contact with a lamp to negative, and this will disconnect when the plug is in. The Ring is connected to ground (+) over a coil (or relay).  When going off hook the lamps lit.
When plugging in the answer cord, the lamp is disconnected but the line is fed via the relay R and the operator may speak to you by operating a switch to operators telephone. (I would probably used an LB circuit as operators phone, and a capacitor in series.)
The caller asks for a number, the operator plugs in the ring plug and operates the magneto generator, waits for answer and disconnect the operators phone.
When bot ends hangs up, the relay releases, and the lamp on the cord-set lights up. when both cords are unplugged the lamp gets dark.

dsk

I have even got a regular New York number :-) 646 570 1796

Offline RB

  • ****
  • Posts: 476
Re: My weekend endeavor
« Reply #9 on: October 30, 2017, 09:51:50 AM »
Thanks Trainman, for the switch info.
And thanks dsk, for the schematic.
I like it when I have options.
I will try this, and see what happens...

Offline dsk

  • Hero Member
  • *****
  • Posts: 3409
Re: My weekend endeavor
« Reply #10 on: October 30, 2017, 10:32:54 AM »
To pick the components may be tricky, The relay shold  operate before 35 milliamps and resist a short of the line without burning out.
A laptop power gives about 18V  we could calculate a telephone to have load like a 200 ohms resistor, so 2 telephones will be 100 ohms load.  Then the relay should be a typical 12V relay but it will need to have a resistance of 200 ohms to operate OK.   If we say 20 ohms on each line you only have about 100 ohms to each coil on the ring side of each jack. 
Not sure, but I guess a 12V 2W (car) instrument lamp will do the job and glow pretty weak when you go off hook, but still survive dialing. Maybe a x-mas tree bulb will do it better? You have to try it out.

dsk

I have even got a regular New York number :-) 646 570 1796

Offline trainman

  • ****
  • Posts: 484
Re: My weekend endeavor
« Reply #11 on: October 30, 2017, 02:44:44 PM »
I took a peek inside my station line jacks. It looks like the tip and ring springs are just about the same length. It sure isnt set up like most of the jacks where tip makes first, and then. Ring.

The 275 jack looks like tip and ring almost make contact at the same time.

Offline RB

  • ****
  • Posts: 476
Re: My weekend endeavor
« Reply #12 on: October 30, 2017, 03:10:19 PM »
Yeah, seems like most all are about the same.
My setup, allows the tip to connect with ring upon plugging in, which shorts the power supply.
it recovers quickly, and works, but I would prefer it did not short out at first.
I wonder how the boards got passed that little ditty?

Offline dsk

  • Hero Member
  • *****
  • Posts: 3409
Re: My weekend endeavor
« Reply #13 on: October 30, 2017, 03:22:55 PM »
I do not really know, but it may have been so to just give a relay a pulse when you put in the plug. The power was never direct to the plug/jack but via some indicator or coil of some type.  Full power to the line could harm the equipment.

dsk

I have even got a regular New York number :-) 646 570 1796

Offline trainman

  • ****
  • Posts: 484
Re: My weekend endeavor
« Reply #14 on: October 30, 2017, 04:07:28 PM »
Because the station line is getting its battery feed from pne source. This is the loop current flowing when you take extension phone off hook. When you plug in, you are switching the power from the first source flowing and switching in the power being fed from the cord circuit. I suspect the station jack is constructed the way it is, to switch so its a seamlesss switchover with no shorts