[sdiy] Eurorack Power Protection

Tim Ressel timr at circuitabbey.com
Tue Jan 3 21:56:57 CET 2017

That is pretty much what I do. Think about a Schottky diode instead of 
the 4001. A BAT85 (PTH) or a SS14(SMT). They drop less voltage. I found 
a 22uF bulk cap is the minimum for noise reduction. Remember the rails 
in  Eurorack case can be noisy. 10 ohms is okay for a module that pulls 
little current. I use 1 ohm.


On 1/3/2017 12:41 PM, Jacob Watters 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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> Synth-diy at synth-diy.org
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--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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