Homebrew PCBs

> On Feb 4, 2015, at 8:57 AM, lists Stuartlists@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
> 
> In article
> <CAMmT-dZ57vncGCgRHDD29pyeAYmBVdzfeGtpKwEnCbW1147aqA@...>,
> Stefan Trethan stefan_trethan@... [Homebrew_PCBs]
> <Homebrew_PCBs@yahoogroups.com> wrote:
> > Depends on a number of factors such as expected pollution, humidity,
> > operating altitude, etc.
> 
> > Something under 0.5mm will possibly result in immediate failure.
> > Something like 1mm would probably be my design minimum.
> 
> > Obviously this is functional insulation only, in other words if this
> > insulation breaks down nothing bad must happen except a blown fuse.
> > For any kind of safety insulation you would need much more than that.
> 
> Thanks. I noted that the 2u2 450V* capacitors I bought had a 0.2" pin
> spacing and I would have thought more than this would be required. I have
> adopted a 0.2" minimum pitch for the tracks and the 0.1" dia pads for the
> capacitor means a minimum of 0.1" or 2.5mm between them.
> 
> * Input capacitors are a pair of 100uF 250V in series with 330k voltage
> equalising resistors.
> 
> -- 
> Stuart Winsor
> 
> Tools With A Mission
> sending tools across the world
> http://www.twam.co.uk/
> 
>