[GreenKeys] How does keyboard actually connect to printer model 19/15

[Harold Hallikainen]

I'm most familiar with the model 15, but I consider the 19 to be a 15 with
14 reperf and TD (though I have never worked on a 19).

In general, stuff goes in a series current loop (normally 60 mA). I'm
using a 125 VDC power supply and a 2.2k 10W resistor to make a 60 mA
current source. The keyboard, selector magnets, and any other equipment
goes in the loop. The power supply I am using is
https://w6iwi.org/rtty/#:~:text=Loop%20Supplies-,152950,-150ma%20%2420.00%20%2D%20This
.

Good luck!

Harold
https://w6iwi.org


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