[iyonix-support] Re: Some Guidance Required Please

  • From: Ron <iyonix@xxxxxxxxxxx>
  • To: iyonix-support@xxxxxxxxxxxxx
  • Date: Fri, 29 Apr 2011 10:34:43 +1200

In message <mpro.lkdlib02n7n2801k0.lists@xxxxxxxxxxxxxxxxxx>
          Steve Fryatt <lists@xxxxxxxxxxxxxxxxxx> wrote:

> On 28 Apr, Julie wrote in message
>     <51cb21b2ebjulie@xxxxxxxxxxxxxxxxxxxxxxx>:
> 
> > On 28 Apr, charles <charles@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > > surely a diode would drop the supply voltage by 1.2v which would give a
> > > 4v supply to the motherboard.
> > 
> > 0.7V if it's silicon, 0.2V if it's germanium, but even that might be too
> > much.
> 
> In theory.  In practice, working out the actual voltage drop will be "a
> little more complicated than that".
> 
> I'm not even sure what the diode is supposed to achieve: the smoothing will
> happen without it (using just another output cap), and adding sufficiant
> capacitance to have any useful effect will still break the PSU's startup to
> the point that either it or the Iyonix are likely not to start at all.
>
 
Well, it would separate the smoothing capacitor and mainboard from the
other less sensitive higher load components such as harddrive CDROM thus
reducing current requirements of the smoothing components.
I recall silicon diodes dropping .4V
Can you get large germanium diodes?

The only other way would be to have a separate small psu feeding the
mainboard. A 5V specific psu might allow adjustment or further filtering.
Getting it to turn on with the main psu would be the thing.

Ron M.
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