Apple IIc power adapter

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April 13, 2014 - 10:14pm
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FLimits
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Apple IIc power adapter

Hi all. Can anyone tell me the specs for the cable that runs from the IIc's external power adapter to the computer? Thanks.

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April 13, 2014 - 10:56pm
david__schmidt
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Re: Apple IIc power adapter

Hmmmm, doesn't format so well here... click the link for a prettier picture.

http://apple2.info/wiki/index.php?title=Pinouts#Apple_.2F.2Fc_External_Power_Connector

Apple //c External Power Connector</p> <p>From the Apple //c Technical Reference Manual</p> <p>Section 11.2.2 The External Power Connector</p> <p>The external power supply is attached to the internal converter by means<br /> of a 7-pin DIN connector. The connector pins are identified in Figure<br /> 11-1 and Table 11-3.</p> <p>Figure 11-1 External Power Connector<br /> . --+ +-- Pin# Signal<br /> . / 7 |_| 1 \ Pin 1 Not Connected<br /> . | 6 2 | Pin 2,3 Signal Ground<br /> . \ 5 4 3 / Pin 4 Shield Ground<br /> . \_______/ Pin 5,6 +15 VDC<br /> . Pin 7 Not Connected</p> <p>Table 11-3 External Power Connector Signals</p> <p>Pin# Name Description<br /> 1,7 -- Not Connected<br /> 2,3 Ground Common Electrical Ground<br /> 4 Chassis Chassis Ground<br /> 5,6 +15 +15-volt DC input to converter

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April 14, 2014 - 7:26am
ericF
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Re: Apple IIc power adapter

Has anyone out there built their own //c power supply to replace the "brick"? I have a spare Mean Well unit sitting around somewhere... think that is +15V / 1.0A (and 1"x2"x2.5").

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April 14, 2014 - 11:45am
FLimits
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Re: Apple IIc power adapter

I haven't yet, but it looks pretty easy. All the info you need is in the Apple IIc Technical Reference Manual, Vol. 1, sections 11.2.1 thru 11.2.3. The stock Apple brick's output is 15V DC at 1.2A, so that's 18W. The internal switching converter will operate on 9 to 20 V DC, so presumably you could supply 12V at 1.5A, for example, or 18V at 1.0A. In any case, 15V at 1.2A isn't hard to find. A quick search and random click-thru gave me this: www.dx.com, SKU # 286469. Even that hardcore retro 7-pin DIN connector turns out to be easy to get. Digikey, for example, has them. In terms of cost, I don't know how it would compare with buying an original power adapter, but it would definitely downsize the brick.

There's actually a guy on eBay selling homemade adapters for the IIc; search for item # 221294478704.

Then again, you could also do your own battery pack. There's a good video that vwestlife did showing his IIc running on a 12V battery at https://www.youtube.com/watch?v=m98agJUoCck.

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August 18, 2018 - 10:00pm
thahammabob
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tore mine apart

my IIc burned out decades ago, just took apart the power supply the harvest the transformer. Tested the output, 19v, don't remember if rectified or not. I think I still have the cord I cut off

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