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Reply to "Restricting Xfmr Output for Childrens Interactive Layout?"

BANDOB posted:

Pardon my electrical ignorance: the variac puts less than 120 v. into the transformer, so the output becomes less than say the 20 v max.(if a ZW) ? So you have to experiment to find the voltage to adjust on the variac to get the desired output from the ZW?

 

Bill,

It's all proportional.  If you have a train transformer set to put 16 volts on the track with it plugged into the usual 120V outlet, when you turn the outlet voltage to 90V (using a variac) the track gets only 12 volts.  The variac reduced the input to 75%, so the track gets 75% of what it would get at full power in.

Ed

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

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