Mike Hord wrote:

>>>Although the article has several warnings about lethality in bold
>>>print, they also neglect to mention an isolating transformer. I can
>>>see someone losing a scope. The plastic timer trimpot they
>>>specify could have been better. A larger one with a plastic knob
>>>for example. And it's left up to the constructor to label the unit
>>>as dangerous.............
>>>      
>>>
>
>  
>
>>I myself have designed a commercial product with mains to 5VDC supply, and
>>an RC  scheme to  provide mains 60hz timing. But when it was being
>>developed,
>>I used an isolation transformer.
>>    
>>
>
>As someone who has always lived almost entirely in tiny voltage
>DC land, I feel I need to ask:
>
>What do you mean by "isolation transformer"?  Are you suggesting
>that ALL measurements on a system which is not galvanically
>isolated from the mains should be done through a 1:1 transformer?
>
>Mike H.
>
>  
>
Yes, absolutely, because you never know when you might have a break in 
the return
path, and make everything hot at 115VAC.

--Bob

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