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Re: Substrate cables

At 03:48 PM 1/2/01 -0500, Lyndle Schenck wrote:
>A good source for transformers are at home improvement stores like Home
>Depot.  They sell low voltage outdoor lighting transformers with built-in
>timers that are cheaper than you can build them yourself.

Be very very careful.   Most cheap transformers are connected to one side 
of the line on the secondary side to save money (often called 
autotransformers).  There is nothing wrong with this design if you wire it 
up correctly and use a GFI to be doubly safe.  If you screw up, they carry 
you out in a box when something goes wrong (or worse yet, one of your 
kids).  Be triply sure you know what you are doing and that you did it right.

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com
NEW Planted Aquaria Magazine:        http://www.wcf.com/pam