[GreenKeys] low Voltage Loop Supply

[Jeffrey Angus]

On 3/24/22 4:59 PM, Jim Cooper wrote:
> Thus the reason original Teletype loops used
> 120VDC and 2000 ohm resistance (approx.) ...
>
> It's tempting to want to use lower voltages,
> but the "Laws of Physics" don't change just
> because we want them to.
The physics is that the 120 volt with 2000 ohm resistor
acts like a current source.
It takes current to over come the inductance.
Much like it takes voltage to overcome capacitance.


-- 
"I am a river to my people."
Jeff-1.0
WA6FWI
www.foxsmercantile.com