[sdiy] Euro Synth Spec

[Pete Hartman]

It's perfectly fine if you have the fuses in place.   The reverse short
blows the fuses, your power is protected, your module is protected.

On Sat, Oct 21, 2017 at 10:47 PM, <axisair at comcast.net> wrote:

> That's not good. I've only see people use 2 diodes as a half wave bridge
> for reverse voltage protection.
>
>
> Sent from XFINITY Connect Application
>
>
> -----Original Message-----
>
> From: pete.hartman at gmail.com
> To: axisair at comcast.net
> Cc: mskala at ansuz.sooke.bc.ca, synth-diy at synth-diy.org
> Sent: 2017-10-21 8:33:45 PM
> Subject: Re: [sdiy] Euro Synth Spec
>
>
>
> On Sat, Oct 21, 2017 at 4:59 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.
>>
>
>
> The diodes are reversed between ground and the rail.  If you reverse the
> supply they will short.
>
>
>
>> 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.
>
>
> The Neutron Sound version of this is a little SMT diode bridge.  A tiny
> bit more expensive, but less PCB real estate.
>
> Whether the diode drop on the rails is significant or not depends on who
> you talk to :)  Personally I like it.
>
> Pete
>
>
>
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