Wiardgroup

There are technical problems with talking about power draw. It is similar to the problems 
in the old days with amplifier power. How do you measure it? If different manufacturers 
use different methods, one may look better than another, but it can be a mirage.

Power draw in a module is not a constant. It fluctuates with usage. So what power do I list? 
Peak, average, RMS? With all inputs and outputs connected or not? If not all then how 
many? If I list the peak power it may be 10 times what the avarage power is. That is a sales 
liability.

The simplest method to determine power supply stability is to have a VCO attached to a 
tuner. Add modules to the power supply until the VCO reaches the level of instability you 
can accept. Then stop. This is bound to be less than the full rated power of the supply. But 
forms a FUNCTIONAL maximum draw.


--- In wiardgroup@yahoogroups.com, Tyler Harwood <stin-g@...> wrote:
>
> On the Blacet order page there is information about the power draw of  
> each module. I have generally tried to add up the maximum draw of  
> agroup of modules and not go over 500mA per PSU. I've had to guess on  
> most of the non-Blacet modules, but it's not hard when using the  
> Blacet page as a reference point. It has wound up being an average of  
> about a rack and a half per PSU so the PSCONN2 comes in real handy  
> and saves some money too.  I'm not sure about the draw of Wiard  
> modules, but given their "unique behavior" I've generally counted  
> them as having a fairly high draw to be on the safe side.
> If Grant doesn't chime in here you could try calling him if you still  
> need to know. {English test!} I think the good old telephone is his  
> preferred form of communication. Closest to analog I guess! Hergh!
> Let us know what you find out!
> ~Tyler
> 
> PS- If you talk to Grant ask him how the new Woggle Bug design is  
> going... I'm scared to do it on this list... or wait... did I just...  
> eek!
> 
> 
> 
> 
> On Aug 28, 2006, at 7:30 AM, drmabuce wrote:
> 
> > Hi Stephane
> >
> > --- In wiardgroup@yahoogroups.com, "stefanbonnet" <stefanbonnet@>
> > wrote:
> > >
> > > (? my english is terrible, sorry)
> >
> > your English is fine!
> > certainly much better than my
> > french/spanish/german/dutch/swedish/italian/russian or even canadian!
> > It seems to me that we yanks are very spoiled. i'm always shocked (and
> > a little shamed) when i learn that a correspondent whom i assumed was
> > American (or maybe British) is a native of Switzerland or Finland!
> > Your English is very clear!
> >
> > > My system will be using several blacet power supplies, and I was
> > just wondering if, besides
> > > the functional/esthetical layout and total current draw, I had to
> > consider possible issues
> > > with powering some specific modules with others from the same psu
> > >
> >
> > no, no issues
> > if your amperage-headroom is sufficient you can run all your Wiard
> > Modules from one power supply.
> >
> > > I think I've read somewhere that Blacet research's power supllies
> > are very conservately run
> > > : is it allright using them at their maximum 500 mA ?
> > >
> >
> > i can't address that issue because i have no experience with Blacet  
> > PSU's
> >
> > best,
> > -doc
> >
> >
> >
>