Date: Sat, 14 Oct 2000 12:45:46 -0500
From: "Larry Williard" <[EMAIL PROTECTED]>
Subject: Lib Power in Car
>So the socket itself does not temporarily connect across the tip and ring as
>you insert it? I mean the shaft into which you plug the plug... Not the
>switching circuit inside some phone jacks...
>And you have looked at the DC coming out of your cigarette lighter with a
>scope as you start the car? Cigarette lighter sockets are usually connected
>all the time. However, the "accessory" or "radio" contacts specifically
>disconnect the device during crank. If they want to protect a car radio so
>much that they would go to the trouble to make a circuit that is hot during
>"run" but dead during "crank" why not use an adapter that filters and
>protect the Libretto?
> Pres
>The conductors on the plug end will DEFINITELY short on insertion.
>The jack end may, or may not, depending on construction.
>I've seen phone plugs used as power connectors, and the offenders should be
>beaten with a delrin rod. David VanHorn
Ok perhaps we have a miscommunication problem here. The jack end does NOT short but
the plug end when inserted could short the tip to ring, depending on the design.
However since the Plug end is on the Lib and the Lib has a diode in series with the
input and there is NO voltage present on it, you can short it all day without any
problems. The plug end is another problem its on the Cig cable end. There a short
would blow the 1amp fuse in the Cig adapter. On my car (a Tempo) the Cig connector is
Disconnected during start. In fact if I do NOT have the battery in the Lib it will
turn off during starting. As soon as the key is released it comes back on. My Lincoln
is the same as is my LeSharo Motor Home.
This is NOT by far the only way to run your Lib from the Car just one. There are
DC to DC switching supplies but you need approx. 2 amps. A 12v to 110v switching
supply and your Lib power supply will also work. Which I used first.
Larry
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