Power Supply

[Chris Rhodin]

There is a laptop power supply available from Marlin P. Jones, stock number 4786-PS $14.95.  They can be reached at 800-652-6733.  The supply provides +5 at 3.5A, +12 at 1.1A, -12 at .040A, -26 at .040A (LCD bias), -5 at .040A.  It's a very small unit without an enclosure.

Being a laptop supply it has 2 power inputs; an 18 volt external input for charging the battery and the 11-16 volt input that is normally connected to the battery.  Ideally you would like it to operate from as little as 7 volts to cover the voltage drop when cranking.  Since it can't do this you may need to add a battery and a couple of diodes to keep it going when the system voltage is low.  A feature that it does have is logic level on-off control, this combined with an external battery would allow you to software control when the computer powered off.

Chris Rhodin