Re: Tingles from power supply

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#1276

From: Robert Baer
Date: Fri, 13 Mar 2009 10:02

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Sylvia Else wrote:

> Robert Baer wrote:
> 
>> Eeyore wrote:
>>
>>>
>>> Robert Baer wrote:
>>>
>>>
>>>>   Sounds line that wall wart is a transformer rather than a switcher
>>>> supply.
>>>
>>>
>>>
>>> You come to this conclusion how ? Measuring the weight for a given DC 
>>> output
>>> would easily sort that out.
>>>
>>> Graham
>>>
>>   Transformers capacitively couple this "tingle" from input (primary) 
>> AC voltage to the secondary.
> 
> 
> How much capacitance would there be between the primary and secondary of 
>  a lower power mains transformer?
> 
> Sylvia.
   My guess is between 10pF and 100pF; measure it on a "free" 
transformer: between a primary wire and a secondary wire.

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