Apple Display Connector Adapter Board
I picked up an Apple Cinema Display at a garage sale for a few bucks. I noted that it had no apparent power connection, but the cable terminated in what appeared to be a DVI connector. Once I got it home, I realized that wasn’t the case. Not only was the connector not DVI, but it was a proprietary connector type called the Apple Display Connector (ADC) that carried digital video data in DVI format along with USB and power. Apple used it on late G3 and G4 Macintosh computers with an ADC video card. Several companies made adapters that supplied power, but they are rare these days and often expensive, such as this Apple-branded one on Amazon.
I looked for several options and found this DIY ADC Adapter article on Tony’s Look, It’s Another Blog. He hand-wired an adapter that worked, but I wanted to do it tidier and with a circuit board; also to improve my skills. Alex also wired a circuit board that he sells on BatchPCB, but in a related Instructable, he notes that he updated to version 1.1 to correct a wiring bug, yet the BatchPCB board appears to say “1.0″ on it (I tried contacting him but without success.) In addition, his version did not include VGA which I wanted to add, and I wanted an Altoids-tin ready board.
Update 2012-Apr-3: (OK, I’ll make an exception.) I made a final version of the board that corrects the inconsequential ground wire error and you
can order it from BatchPCB here.
Update 2014-Jan-16: OSH Park added a feature where you can share your designs, so now you can find it here.
Update 2014-Apr-9: I’ve had a couple requests for the part numbers to get this thing all assembled. The LEDs and resistor are optional and only for power indication, except for the 1K resistor which tells the monitor to turn on (I think … it’s been a while.) The diode is also optional; it’s only there if power to the ADC was needed from USB (which I guess it’s not.) The capacitor must be at least 30 volts and can be as small as 10µF up to about 100µF. The VGA port is optional, but it will connect correctly to the DVI so it should work as a DVI-VGA adapter (if your DVI port supports analog, which most don’t anymore.)
I’m not going to specify a source for LEDs, capacitors, resistors, and diodes—you can find them at any store that sells electronic components, but here’s the rest of the parts. Note that you can also use a standard USB-B socket (all the popular ones I’ve seen have 4 pins in a square pattern; if the shield doesn’t fit in the holes, it can be omitted or just bent over and surface-soldered in place). If you must have a complete materials list, here’s the sources:
|ADC connector||Surplus Sales of Nebraska, #(CPC)DV3R035N11|
|DC power socket (Kycon)||Mouser, #806-KLDHCX-0202-A|
|DVI connector (Molex)||Mouser, #538-74320-9014|
|MicroUSB connector (Molex)||Mouser, #538-105017-0001|
|high-density DB-15, female, right-angle (optional) (Norcomp)||Mouser, #636-181-015-213R171|
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