[GreenKeys] Arduino Code/Speed Converter

[Jim Haynes]

On Fri, 24 Jan 2020, Gil Smith wrote:

> 36 volts is probably a good choice also.  The purists may say it needs to be
> over 100V to burn oil off contacts and such, but if a lower voltage loop is
> working for you go for it.
> 
A reference on this topic is Western Union Technical Review 15:4, October 
1961, p. 149.

Also Western Union Technical Review 5:1, January 1951, p. 32.