[sdiy] P-p-power!!!

Neil Johnson neil.johnson71 at gmail.com
Tue Apr 16 09:18:06 CEST 2019


> Google for
>
> Mutual shutdown power supplies
>
> Larger mixing desk power supplies often have this function. Check the
> power supply section in Self's SSAD.
>
> Neil
>
>
>
>
> On Tue, 16 Apr 2019, 04:09 Tim Ressel, <timr at circuitabbey.com> wrote:
>
>> Yo,
>>
>> I am putting together a power supply for my new 5U case. At first I just
>> have 7815 and 7915 regulators. But then it occurred to me: would it not
>> be indeed nice to have both rails fold back if one over currents? to
>> answer my own question, why yes, yes it would.
>>
>> So now to make it work. I thought of using LM317 and LM337s and do a
>> cross-over thing. Use an op-amp to servo off of a virtual ground set up
>> with a voltage divider. I am not sure if that will do what I want. I
>> guess I can try it with the 'L' versions; easier to put into foldback.
>>
>> I also thought of using LM723s but that gets complicated in a hurry.
>> More than I want.
>>
>> Thoughts?
>>
>> --Tim (musing aloud) Ressel
>>
>> --
>> --Tim Ressel
>> Circuit Abbey
>> timr at circuitabbey.com
>>
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>>
>
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