[sdiy] Euro Synth Spec

[Kylee Kennedy]

Neutron Sound has a reversable header on his newer modules. His designs are
open source so people should borrow it and use it in their own designs.


Kylee

On Saturday, October 21, 2017, Mike HEQX <mike at heqx.com> wrote:

> 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
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','pete.hartman at gmail.com');>
> To: mskala at ansuz.sooke.bc.ca
> <javascript:_e(%7B%7D,'cvml','mskala at ansuz.sooke.bc.ca');>
> Cc: synth-diy at synth-diy.org
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','mskala at ansuz.sooke.bc.ca');>
>>    People before principles.
>> http://ansuz.sooke.bc.ca/
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