[GreenKeys] Missing power supply?

[Duncan Brown]

Johnathan,

Yes, you are missing the power supply.

You don't need it if you are going to drive the TT-98 from a FSK 
converter; most of them have the loop supply built in.

Otherwise, you need to build a supply that will provide 120-150VDC at 20 
or 60 ma. (The TT-98 will run on either loop current - switch on the 
side of the gold box.)  Regulation of the supply is not at all critical. 
(It takes a high voltage to overcome the inductance of the selector 
magnet coil, but much less to keep the coil energized.)

The TT-119 & TT4- that are on  E-bay  that Lar referenced do not have 
built in supplies.

have fun,

Duncan


On 05-Jan-12 20:33, Jonathan Mc Donald wrote:
> Greetings group.
>
> I've been digging around in the Kleinschmidt tt-98, and also reading 
> the lengthy manual whence I chanced upon a drawing of a power supply. 
>  My teletypewriter was blessed with a void in the back that I thought 
> was for a battery.  Would one of you kindly peeps watch this short 
> video and tell me if I'm missing a power supply or not.
>
>
> http://youtu.be/gKjehHD4Jdw
>
> Thanks,
> Jonathan / kg6tgr
>
>
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