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Roland Huisman
June 7th, 2017, 02:22 AM
Hi,

Does anyone have the documentation for the Northstar Horizon "power booster"?
This is an add-on in the Northstar Horizon to give a power boost if you want to use an internal hard drive.
I can't find any pictures or documentation of a Northstar which has an original hard disk.

The only document is this hard disk manual where it's mentioned...
http://bitsavers.informatik.uni-stuttgart.de/pdf/northstar/Northstar_HD5x_Installation_Guide.pdf

I'm very curious! Does anyone have the schematics of the power booster?
(I'm curious about the schematics for the HD controller as well))

Regards, Roland

Roland Huisman
June 11th, 2017, 02:04 PM
The answer is on ebay...

http://www.ebay.com/itm/Northstar-HRZ-HD-5-PWR-Supply-PCB-/141792519600
Just a PCB with a powerful 12V TO3 regulator, an 5V TO220 regulator and two capacitors. Nothing special.
The regulators for the floppy drives are probably to weak and no sufficient cooling on the 12V.
The 12V of a hard disk can go up to 3 amps and even more at spin-up...
That is why the regulatorboard is put on the back of the Northstar.

Regards, Roland