LisaList2

General Category => LisaList2 => Topic started by: compu_85 on July 28, 2020, 05:41:18 pm

Title: Powering an IDEFile inside a 2/5
Post by: compu_85 on July 28, 2020, 05:41:18 pm

I have 2 of Patrick's excellent IDEFiles, would like to mount one in the empty space of my 2/5.

Question: Does the +12v supply on the Twiggy cable have enough umph to safely power a Conner 3.5 disk? It looks like the running draw is about 7w. 

Thanks!

-J

Title: Re: Powering an IDEFile inside a 2/5
Post by: patrick on July 29, 2020, 02:00:27 pm

A Twiggy Drive draws up to 1.6 A on the 12 V rail and up to 0.4 A at 5 V. So I assume this will be enough for the Conner Drive.

To be sure you could start with a CF card or DOM module, and if everything works properly switch to the spinning rust with its authentic sound :-)

Title: Re: Powering an IDEFile inside a 2/5
Post by: compu_85 on August 13, 2020, 11:30:03 pm

I soldered on to the Lite adapter for a completely reversible mod.

It's working great!

Thanks,

-J

Title: Re: Powering an IDEFile inside a 2/5
Post by: Lisa2 on August 14, 2020, 03:48:12 pm

BTW, on the 2/5 wiring harness there is an unused 3 pin connector with +5V, +12V, and Ground available to use for powering drives as well. 
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Title: Re: Powering an IDEFile inside a 2/5
Post by: patrick on August 15, 2020, 06:38:42 am

Quote from: Lisa2 on August 14, 2020, 03:48:12 pm

BTW, on the 2/5 wiring harness there is an unused 3 pin connector with +5V, +12V, and Ground available to use for powering drives as well. 

You are right concerning +12 V (white-orange) and Gnd (black).

But (at least on my 2/5 harnesses) white-green goes to pin Y of the power supply connector. For the later PSUs this pin provides a power-fail signal that is used inside the 2/10 to reset the Widget. For ealier PSUs (1.2 A single line voltage model) according to schematic 050-4011-J Pin Y+21 are not connected.

Title: Re: Powering an IDEFile inside a 2/5
Post by: Lisa2 on August 17, 2020, 10:53:54 am

Patrick,
I stand corrected.  I had used this connector to power a cooling fan in one of my systems over 25 years ago, after all this time my memory must be failing me.

Has anyone every established what the intended purpose of this connector is?

Thanks,
Rick

Title: Re: Powering an IDEFile inside a 2/5
Post by: compu_85 on August 26, 2020, 07:59:48 am

I wondered the same thing.

On my late 2/5, with an original Apple supply, I found only +12v at the connector. If it would have had +5v I'd have used it instead of the floppy supply.

Title: Re: Powering an IDEFile inside a 2/5
Post by: blusnowkitty on August 26, 2020, 09:27:59 am

Quote from: compu_85 on August 26, 2020, 07:59:48 am

I wondered the same thing.

On my late 2/5, with an original Apple supply, I found only +12v at the connector. If it would have had +5v I'd have used it instead of the floppy supply.

If anyone knows what kind of connector that mystery plug is, I'm sure I can knock together an adapter board to regulate the +12 into +5. Or do the voltages on that connector change if you're using a 1.2 vs. a 1.8?