[V6-12v] first problem sooner than later***Updade***

[Ron Wainwright]

  Tom,

  Reply inserted below.

--- tomchr at ee.washington.edu wrote:

> Argh!!!! Connecting a 9V battery to the 12V system
> in the car will likely cause the 9V battery to get
> really, really hot. I would not be surprised at all
> if it exploded!!
> 
> To avoid battery explosions, connect a diode in
> series with the 9V battery. Any silicon small-signal
> rectifying diode should work. 1N4148, 1N4007 (or any
> diode in the 1N400x series) should work just fine.
> You can get these diodes at Radioshack - or any
> other store dealing with electronic parts.
> 
> The diode has two pins - anode and cathode. The
> cathode is marked with a band printed on the body of
> the diode. Connect the cathode of the diode to the
> center pin of the cigarette lighter plug and connect
> the anode to the plus terminal of the 9V battery.
> Connect the minus terminal of the 9V battery to
> ground (the outer ring of the cigarette plug).
> 
> The diode will block 12V from entering the 9V
> battery but will allow current to flow from the 9V
> battery to the circuit in the car once the 12V is
> disconnected.
> 
> Tom


  I bow my head in the presence of your E-mail!!
 Exactly what I was looking for.
Thanks
Ron


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