Newsgroups: comp.sys.apple2 Path: news.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!math.ohio-state.edu!uwm.edu!spool.mu.edu!olivea!hal.com!decwrl!waikato!comp.vuw.ac.nz!actrix.gen.nz!dempson From: dempson@swell.actrix.gen.nz (David Empson) Subject: Re: power supply for Apple IIC Organization: Actrix Information Exchange Date: Sat, 13 Nov 1993 04:06:34 GMT Message-ID: References: <53269@db.GBA.NYU.EDU> Sender: dempson@actrix.gen.nz (David Empson) Lines: 72 In article tomk@pro-nsdapple.cts.com (Tom Kelly) writes: > In <53269@db.GBA.NYU.EDU> > sbhattac@db.GBA.NYU.EDU (Shankar Bhattacharyya) writes: > >I need a replacement power supply for an Apple IIC. Since I am quite Apple > >ignorant, I would appreciate any pointers as to where I might be able to > >get one. > >Alternatively, any advice as to how to take the power supply apart without > >destroying it might also be helpful. > >Thanks for any help you can give me. > >- Shankar > > > Which part is bad the external "brick" or the internal part of the power > supply. I believe that the 'brick" is just a RAW 13vdc supply. According to the IIc reference manual, it provides 15VDC output, at 1.2A. If you are going to replace the brick with your own supply, use one with a slightly higher current output, if possible. The internal power converter can be run from a DC supply which provides between 9V and 20V. If you use a lower voltage, you'll need to supply more current (and vice versa). The converter is rated at 25W maximum. I have heard that the IIc can be run from a car battery (or the cigarette lighter socket). I don't think a battery charger would be a good idea - it probably switches the current on and off, and may use a much higher voltage. The internal power converter outputs power to the IIc as follows: +5V at 1.2A +12V at 0.6A continuous, 0.9A intermittent, and 1.5A surge for less than 100 ms. -12V at 100 mA -5V at 50 mA (not used in the IIc) The external power connector is a 7-pin male DIN socket. The pins are: notch 7 1 6 2 5 3 4 1 and 7 are not connected. 2 and 3 are signal ground. 4 is shield ground. 5 and 6 are power input. The internal power connector is apparently a 44 pin header. The odd numbered pins (along one side) are all ground. The even numbered pins are as follows: 2, 4 Ground 6, 8 -12V 10 No connection 12 External power input, via the switch on the IIc 14-22 +12FIN (whatever that means; possibly +12VIN input voltage) 24, 26 Ground 28-34 +5V 36-40 +12V 42, 44 Ground -- David Empson dempson@swell.actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand Newsgroups: comp.sys.apple2 Path: news.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!math.ohio-state.edu!howland.reston.ans.net!wupost!waikato!comp.vuw.ac.nz!actrix!dempson From: dempson@actrix.gen.nz (David Empson) Subject: Re: Apple //c power pinouts Message-ID: Keywords: //c power supply Organization: Actrix Information Exchange References: Date: Mon, 25 Apr 1994 01:51:39 GMT Lines: 26 In article , David Buckley wrote: > I've got a //c without a external `power brick'. The connector > for the external transformer is a 7 pin DIN, and only three of > the pins seem to connect to the power circuitry on the motherboard. > The label on the bottom claims that it requires 15Vdc @1.2amps; > I'm guessing that the three pins are -7.5, ground, and +7.5. Nope. The seven pins are as follows: 1 and 7 are not connected. 2 and 3 are signal ground 4 is shield (chassis) ground 5 and 6 are +15VDC The pins are numbered clockwise, starting to the right of the notch. The internal power converter can accept any voltage from 9V to 20V, but I wouldn't recommend going below 12V. You will need to supply more current at lower voltages, and less at higher voltages. It is possible to run a IIc from a car battery (e.g. via the cigarette lighter socket). -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand