[sdiy] Euro Synth Spec

[Mike HEQX]

Why can't gear run on anything you plug in either polarity dc or ac. 
Using a diode bridge as protection should allow you to do this. Some of 
my gear will run on anything you plug in. I love that.

On 10/21/2017 5:59 PM, axisair at comcast.net wrote:
> Two parallel diodes reverse biased won't short out the supply, they 
> just wont allow current to get to the circuit.
> For the price of about $0.015, I just use four 1N914 small signal 
> diodes in a full wave bridge configuration. That just supplies the 
> correct power to the rest of the circuit regardless of if the polarity 
> is reversed. The voltage drop from the mains is 0.6V to 0.7V per leg. 
> Minimal drop considering the existing overhead.
> Since they're small signal diodes, they can handle around 1/3A and 
> have less reverse bias leakage (and cost less) than 1N40XX series. 
> They also double as a fusible link if the circuitry faults.
> Obviously, if they connect everything correctly, two diodes just sit 
> there.
>
>
> Sent from XFINITY Connect Application
>
>
> -----Original Message-----
>
> From: pete.hartman at gmail.com
> To: mskala at ansuz.sooke.bc.ca
> Cc: synth-diy at synth-diy.org
> Sent: 2017-10-21 2:41:48 PM
> Subject: Re: [sdiy] Euro Synth Spec
>
> And in that latter case usually we put ptc fuses in line as well so we 
> DON'T actually damage the supply or other modules.
>
> I do diy, not commercial modules, but the same logic applies.
>
> On Oct 21, 2017 3:24 PM, <mskala at ansuz.sooke.bc.ca 
> <mailto:mskala at ansuz.sooke.bc.ca>> wrote:
>
>     On Sat, 21 Oct 2017, Ben Bradley wrote:
>     > Do many or any Euro modules have reverse-polarity protection? It
>     seems
>     > easy enough to add a series Schottky rectifier in series with each
>     > power line, but it adds parts cost and drops a little voltage where
>     > people are already thinking the 12V supplies should be 15V.
>
>     Many; not all.  Some do it in other ways, such as with parallel diodes
>     that will be reverse-biased in normal operation and effectively
>     short out
>     the power supply when the connection is backwards.
>
>     --
>     Matthew Skala
>     mskala at ansuz.sooke.bc.ca <mailto:mskala at ansuz.sooke.bc.ca>        
>      People before principles.
>     http://ansuz.sooke.bc.ca/
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