[sdiy] Eurorack Power Protection

Richie Burnett rburnett at richieburnett.co.uk
Wed Jan 4 13:19:47 CET 2017

Neat!  I like how the MOSFET channel conducts to remove the otherwise 
excessive voltage-drop of the body-diode when the supply is connected the 
correct way around.  It's a bit like the synchronous rectifier in modern 
SMPSUs.  I think I've also seen that circuit used to allow PV panels to 
charge a battery efficiently, but then disconnect the panel to prevent the 
battery draining back into the panel when it's dark.


-----Original Message----- 
From: Roman Sowa
Sent: Wednesday, January 04, 2017 10:38 AM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] Eurorack Power Protection

I've been using this P-MOSFET protection for about a decade now and it
saved a lot of boards out there. People love to connect power backwards,
especially when there are ony 2 wires to connect. Must admit I'm also
guilty of powering backwards the boards I designed myself, so you think
I should know how to connect it, right? Well, shit happens.

It works great, no drop in voltage and good protection. But if you
connect AC voltage it will burn. But only the P-MOSFET will burn and
protect the circuit at its last duty. That happened a few times.


W dniu 2017-01-04 o 05:23, AlanP pisze:
> On 4/01/2017 9:41 a.m., Jacob Watters wrote:
>> Thank you for your feedback and suggestions.
> Lazy bugger that I am, I haven't used these, but R.G. Keen has a couple
> of suggestions for this problem in the guitar pedal world.
> http://geofex.com/Article_Folders/mosswitch/mosswitch.htm
> http://www.geofex.com/article_folders/cheapgoodprot.htm
>> Sincerely,
>> Jacob Watters
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