Homebrew PCBs

While on the subject -

Keep in mind when doing jump starting this Winter, come cars are 
being switched over to 24 volt system (not positive it is 24Volts, 
but something higher than 12 volts).




--- In Homebrew_PCBs@yahoogroups.com, Robert Hedan 
<robert.hedan@v...> wrote:
> Yeah, removing negative is much better, I posted the wrong 
terminal.  It
> also doesn't generate sparks when you're fiddling with it.
> 
> Don't rely on which cable is grounded on the chassis though, there 
are
> models that use positive ground just to keep people on their toes.
> 
> The best indicator of which cable is which is the small symbol 
near the
> terminal. Don't trust the terminal rubber covers or cable 
colours 'cause
> that can be replaced 'wrong' by a previous owner.
> 
> Robert
> :)
> 
> 
> -----Message d'origine-----
> De : Homebrew_PCBs@yahoogroups.com 
[mailto:Homebrew_PCBs@yahoogroups.com] De
> la part de Stefan Trethan
> Envoyé : juillet 3 2005 13:53
> À : Homebrew_PCBs@yahoogroups.com
> Objet : Re: [Homebrew_PCBs] Re: Hmm, another thought....
> 
> 
> You know it is better to disconnect negative? If you start with 
positive  
> you can easily short it to ground with the wrench while you undo 
the nut  
> on the clamp. Also, there is often no obstructing rubber thingy on 
it.  
> Open circuit is open circuit so that doesn't change anything.
> 
> As for using car batteries for EDM, you still need to limit 
electrode  
> current and switch it on/off. You could probably replace the first 
part of  
> the large supply schematic with them, but i think then you can 
just as  
> well go all the way.
> 
> ST
> 
> 
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