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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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11th Apr 2020, 8:46 pm | #1 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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N diagram /circuit diag anyone
Found this socket in amongst my old sockets . From what I remember it's fitted to older BT systems to ring an extension bell from extension phones and needs a 50v supply of correct polarity ( something which a lot of customers did not realise , resulting in one of the power resistors -R5/R6 ?, going up in smoke).
All I can find on the socket is a number DPA1448A which means little to me as I never got involved in BT systems. Anyone from BT systems remember this one and point me to an N diag or circuit diagram please. |
11th Apr 2020, 10:05 pm | #2 | |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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Re: N diagram /circuit diag anyone
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11th Apr 2020, 10:21 pm | #3 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: N diagram /circuit diag anyone
It's got the old style BT logo on the front The short line with a longer line at right angles ,with a set of two dots to the right.And all in a circle.
From memory ,I seem to remember this type of socket fitted to possibly a Herald extension, to let an extension bell ring from a system extension. Looking at the socket, it seems so similar to a "ringing generator 2A" , which was operatd on a mains supply. Last edited by Oldcodger; 11th Apr 2020 at 10:36 pm. |
12th Apr 2020, 8:02 am | #4 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
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Re: N diagram /circuit diag anyone
You mean this one:
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12th Apr 2020, 8:05 am | #5 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
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Re: N diagram /circuit diag anyone
By the way, I misremembered it as having three dots, which would have made the upper bar a "B" in Morse code.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
12th Apr 2020, 1:51 pm | #6 | |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
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Re: N diagram /circuit diag anyone
Quote:
The current logo is so unimaginative, but no doubt someone got richer by designing it.
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12th Apr 2020, 3:25 pm | #7 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: N diagram /circuit diag anyone
That's the one ,Dave.
Thinking back, this socket was fitted to one port on something like a Herald ( possible Pentara) with a four wire termination on it ,along with 50v from the switch and a bell out pair. I've never fitted one as I spent most of my time replacing BT systems with Panasonic systems ( except when the firm did either TIG or MIG welding when I sent the order back for a technical inspection as Panasonic did not like MIG/TIG). |
12th Apr 2020, 5:35 pm | #8 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
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Re: N diagram /circuit diag anyone
I notice that you mentioned the socket last October in the context of ringer boosting (post no. 7). Found while googling the number at the top.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
12th Apr 2020, 9:18 pm | #9 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: N diagram /circuit diag anyone
Dave- I mentioned both variants as solutions to ringing, with no clue to what they were/what they did or circuits.
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13th Apr 2020, 6:41 pm | #10 |
Octode
Join Date: Aug 2005
Location: Saltburn-East, Cleveland, UK.
Posts: 1,786
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Re: N diagram /circuit diag anyone
Hi, I once owned one of these sockets which came with an Ambassador 2+4 system.
From memory the socket allows an additional bell to be associated with the system phone connected to it. I think there's a link in the system phone which has to be opened to allow the external bell to operate. I can see no reason why the socket wouldn't also operate on the the Senator 5 + 10 and possibly other systems of a similar design which use dedicated system phones. Regards Andrew |
13th Apr 2020, 7:17 pm | #11 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
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Re: N diagram /circuit diag anyone
If it works with the Ambassador, I would expect it also to work with the Senator, given that, as far as I know, the only real functional difference between them is how exchange lines are accessed.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
14th Apr 2020, 4:37 pm | #12 | |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: N diagram /circuit diag anyone
Quote:
But back OT- anyone got a circuit diagram for one of these ? |
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