Using an AC-to-AC wall wart transformer/adapter in reverse

When it's loosely coupled. A good example is the wall wart Ma Bell used to give ^H^rent you to light up your Princess phone. Open circuit was say

I still have a Princess phone. There never was a wall wart for it. They are exchange powered. Maybe you had a vastly different model that looked the same.

Eh? MANY years ago we had a Princess phone. But it had a wall-wart of sorts... transformer with screw-terminals and ordinary phone hook-up wire from there to phone.

...Jim Thompson

That's relatively new ----^^^^^^

Our circa 1970 transformer has screw terminals for the output.

...Jim Thompson

Aha! That's the way I remember it.

...Jim Thompson

Princess phone was in master bedroom, but transformer was located remotely in a service closet.

...Jim Thompson

That one's linear, AC to DC, with horrible regulation: 10.5V -> 6V NL-FL Here's one that's just a transformer with better specs: 16V -> 12V NL-FL

http://204.202.11.159/tamuracorp/clientuploads/pdfs/engineeringdocs/212AS12012.pdf

JF

In article ,

IIRC, the original Princess had incandescent lighting for the dial. The phone would work fine (without lighting up) on an ordinary phone line, but did require the wall wart for the dial to light. There was apparently a low-level "night-light" glow when the phone was on-hook... and this *had* to come from a wart rather than from the exchange, as phones aren't permitted to draw more than a tiny amount of current from the line when on-hook.

I believe I recall that the wall wart was designed with a mounting ring, through which you could fasten the wall-outlet-plate screw, so that the wart was secured into the outlete and could not come loose.... >search

Mine needed the wall-wart.

...Jim Thompson

The *phone* was exchange powered--it was the lighted dial that needed the wall wart, so it wouldn't go out when you hung up the phone.

Cheers,

Phil Hobbs

...Jim Thompson

Tell that to someone with FiOS. Comes with a nice battery pack for your furnace room---which you get to maintain.

Cheers

Phil Hobbs

My son has that. Me I just have an ordinary POTS telephone service. (And UPS's on the phone system so the wireless stuff keeps working during a power outage ;-)

...Jim Thompson

Amen. That's why I have DSL even though it costs nearly the same.

Cheers,

Phil Hobbs

Amen. That's why I have DSL even though it costs nearly the same.

Cheers,

Phil Hobbs

"John Fields" Sillier than Anyone Else

http://204.202.11.159/tamuracorp/clientuploads/pdfs/engineeringdocs/212AS06020.pdf

Other factors makes the regulation much poorer than a simple transformer.

..... Phil