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DIY heater cables transformer source

I have DIY substrate heater cables in my 75.  I am starting another tank and
wanted to do them in this smaller tank.  I found out from my model train nut
neighbor that toy train transformers are 12-volt and have primary and
secondary windings.  I am going to try this on the new tank.  I am intrigued
that may be able to vary the output with the speed regulator!!