[sdiy] Eurorack Power Protection

Pete Hartman pete.hartman at gmail.com
Tue Jan 3 22:04:30 CET 2017


BTW I also always protect V2164/SSM2164 chips with a bat85 per Neil's
solution:
http://www.milton.arachsys.com/nj71/index.php?menu=2&submenu=2&subsubmenu=3

On Tue, Jan 3, 2017 at 3:02 PM, Pete Hartman <pete.hartman at gmail.com> wrote:

> I don't like the 10R resistors, because a power hungry module will cause
> itself supply instability.  I've seen this on a couple of VCOs, for example.
>
> I usually put PTC fuses in that position, and run the diodes, reverse
> biased, to ground.  If you plug that in backwards, it trips the fuses
> generally before bad things can happen further down the line.
>
> I also don't usually put .1uF caps at the power inlet, I just use them to
> bypass each chip's supply pin or pins.
>
> I recommend using shrouded headers on a Euro module -- yes, bad cables can
> still be plugged in backwards, but it's sufficient to allow me to safely
> plug a known-good cable in without having to physically look at the place
> I'm plugging in (say, inside my case).
>
> Now I will sit back and allow myself to be schooled by the more
> experienced about why what I'm doing is wrong :-D.
>
> Pete
>
>
>
> On Tue, Jan 3, 2017 at 2:41 PM, Jacob Watters <jacobwatters at gmail.com>
> wrote:
>
>> Do you do anything to the power rails on your modules to filter the power
>> and/or protect the module?
>>
>> Diodes? Caps? Resistors?
>>
>> Below is a link to one well protected module that was recommended to me.
>> Note that the power source is the pins on P3 and the power rails are the
>> local ones on the module (kind of confusing in this schematic - it looks
>> like the diodes are backwards).
>>
>> I know that the diodes will cause a voltage drop that will limit the
>> overhead for opamps. My module is a filter with an overdrive circuit that
>> clips at +/-5V, so overhead isn't really a concern.
>>
>> http://jacobwatters.com/images/synth/europower.png
>>
>>
>> Thank you for your feedback and suggestions.
>>
>>
>> Sincerely,
>>
>> Jacob Watters
>>
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>>
>>
>
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