yep, my learning curce is just somewhat rather like climbing a vertical wall (sometimes), but i will eyeball the schematics and hold it against what you have just told.... must get it at some point :-)<br><br>/bo<br><br><br>
<div class="gmail_quote">2013/6/11 Kevin Wood <span dir="ltr"><<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Yes, this is also fair comment. Making this circuit safely relies on an<br>
understanding of *exactly* how it works, as the author goes to some<br>
lengths to point out.<br>
<br>
Kevin<br>
<br>
> If you don't know the answer to particularly the first of those two<br>
> questions then you shouldn't be tackling a project involving direct<br>
> connection to mains.<br>
><br>
> Mike<br>
><br>
> ----------------original message-----------------<br>
> From: "Bo Herrmannsen" <a href="mailto:bo.herrmannsen@gmail.com">bo.herrmannsen@gmail.com</a><br>
> To: "Closed list for developer discussions"<br>
> <a href="mailto:opentrv-dev@lists.opentrv.org.uk">opentrv-dev@lists.opentrv.org.uk</a><br>
> Date: Tue, 11 Jun 2013 14:11:05 +0200<br>
> ----------------------------------------------------------<br>
><br>
>><br>
>>I'm working a bit again on a circuit that allows safe and "almost" error<br>
>> free<br>
>>messurement on mains voltage (search givmon on openenergy)<br>
>><br>
>>i have all the bits reasonble placed and observed the 3mm creepage<br>
>> between mounting<br>
>>holes etc...<br>
>><br>
>>but i need to calc what voltages there are present where to make 100%<br>
>> sure<br>
>><br>
>>of course i have googled but i cant find an easy to understand answer for<br>
>> these 2 q's:<br>
>><br>
>><br>
>>adding 3 2.2Mohm in series to both the neutral and line wires.. what<br>
>> would the drop be?<br>
>><br>
>>and what would the drop be across a 0.47uF capacitor? the mains are<br>
>> connected via that to<br>
>>a bridge recitifier and need to know what voltages i can expect arround<br>
>> those<br>
>><br>
>>/bo<br>
>><br>
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><br>
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