[hpsdr] [ATLAS] - proposed physical bus/pcb design 03March2006
Eric Ellison
ecellison at comcast.net
Sun Mar 5 07:40:25 PST 2006
Phil
Me the dummy!
One question re the LEDS. Would it be possible to provide through holes on
the diode bank for a dual .1 header so the LEDS could be brought 'off board'
to a front panel, at the same time leaving the smt option? Also add a pair
for switching the power supply via the ATX connector?
Thanks
Eric
-----Original Message-----
From: Philip Covington [mailto:p.covington at gmail.com]
Sent: Sunday, March 05, 2006 8:58 AM
To: Eric Ellison
Cc: Phil Harman; High Performance Software Defined Radio Discussion List
Subject: Re: [hpsdr] [ATLAS] - proposed physical bus/pcb design 03March2006
Hi Eric,
The LEDs and power connectors are on sheet 7 of the schematic. Sheets
1-6 are for the corresponding slots.
73 de Phil N8VB
On 3/5/06, Eric Ellison <ecellison at comcast.net> wrote:
> Phil
>
> Even better. I wondered about the six pin! Thought it was for a switch
etc.
> This is even better! I looked for the resistors and leds on the schematic
> and J-18 but didn't see them.
>
> Looks like you have thought of everything!
>
> Eric
>
>
> -----Original Message-----
> From: Philip Covington [mailto:p.covington at gmail.com]
> Sent: Sunday, March 05, 2006 7:58 AM
> To: Eric Ellison
> Cc: Phil Harman; High Performance Software Defined Radio Discussion List
> Subject: Re: [hpsdr] [ATLAS] - proposed physical bus/pcb design
03March2006
>
> Hi group,
>
> The six pin 0.100 header on the board was intended to provide an
> alternate way of supplying power to the Atlas and plugged in boards
> during the prototyping/testing phase. It also can be used as test
> points to measure the voltages supplied by what ever is connected to
> the ATX 20 or 24 connector. Personally, I intend to use clip leads
> from my triple output bench supply for prototyping - the 6 pin 0.100
> spaced header make that pretty easy. I don't need to supply the
> voltages that I am not using on the bus during the prototyping phase.
>
> I had considered the need to limit the current available from the ATX
> power supply, but quickly dismissed the idea because of the added
> components and cost. That is how the other alternate power connector
> came about.
>
> You can easily get the mating plug for the 20 or 24 pin MOLEX ATX
> connector if you want to use a supply other than an ATX power supply.
> Heck, you can even cut it off of an old ATX power supply. I don't see
> why we should put some other MOLEX connector on the board other than a
> 20 or 24 pin MOLEX (other than for saving space).
>
> I planned on posting a revised schematic and document today, but I am
> going to hold off until we get the power supply connector issues
> worked out.
>
> 73 de Phil N8VB
>
> P.S. They default of reply-to-sender instead of reply-to-list SUCKS!
>
>
> On 3/5/06, Eric Ellison <ecellison at comcast.net> wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Phil
> >
> > I think you meant this to go to the list, even if not, your points are
> well
> > taken. No question that the current available from the ATX is overkill.
I
> > was also sitting here thinking "Where are the fuses?".
> >
> > OTOH: I am pretty much a 'plug and play' person, and for the cost of a
10
> > ohm 10 watt resistor, a switch, and a degree of caution, a standard
> computer
> > case with few modifications makes a pretty good 'end product'.
> >
> > Using a small molex connector on the MB 'mandates' power supply
> > modification, even if only the cable.
> >
> > As usual I feel strongly ALL ways! (smile), also really like that little
> > pico supply!
> >
> > Thanks
> > Eric
> >
> >
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: Phil Harman [mailto:pvharman at arach.net.au]
> > Sent: Sunday, March 05, 2006 5:45 AM
> > To: Eric Ellison
> > Subject: Re: [hpsdr] [ATLAS] - proposed physical bus/pcb design
> 03March2006
> >
> > Second take on the ATX connector.
> >
> > The boards that we attach to the Atlas bus are in many cases going to be
> > prototypes and development boards. There is the inevitable chance that
> > there will be circuit and operator errors. With a full blown ATX power
> > supply connected to the bus - that can provide may 10's of amps - such
> > errors can be 'interesting' to say the least. ATX power supplies are
> > intended to power production designs that are not subject to tinkering.
If
> > we use a small Molex header then connecting up regulated and current
> limited
> >
> > power supplies during the testing and development phases is very simple.
> >
> > Since I don't see a high power PA being on of the six boards we don't
need
> > 10's of amps anyway. I'm not suggesting that we don't use ATX power
> > supplies for a final and proven design - just not during the development
> > phases.
> >
> > I still support the case for a simple, small, Molex connector on the
Altas
> > bus.
> >
> > Phil...VK6APH
> >
> >
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Eric Ellison" <ecellison at comcast.net>
> > To: "'Eric Ellison'" <ecellison at comcast.net>; <pvharman at arach.net.au>;
> > "'Philip Covington'" <p.covington at gmail.com>
> > Cc: "'High Performance Software Defined Radio Discussion List'"
> > <hpsdr at hpsdr.org>
> > Sent: Sunday, March 05, 2006 6:12 PM
> > Subject: RE: [hpsdr] [ATLAS] - proposed physical bus/pcb design
> 03March2006
> >
> >
> > > Second take
> > >
> > > If a solution to the 20 - 24 pin is not quick and simple just stay
with
> > > current design. It accommodates the slick little pico supply and is
> KISS.
> > > All the powers we need are on the 20 pin and Phil has allowed for the
> load
> > > resistor etc. 20 pin supplies will be around for a long time. Probably
a
> > > lot
> > > longer than the life cycle of the Atlas. Future rev of the Atlas when
24
> > > pin
> > > supplies are far more prevalent than 20 pin is probably a better
route.
> > >
> > > 24 pin to 20 pin adapter cables are readily available.
> > >
> > > My second 2 cents. And vote. Really nice design Phil! Build it and we
> will
> > > come!
> > >
> > > Thanks
> > > Eric
> > >
> > > -----Original Message-----
> > > From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On
Behalf
> > > Of
> > > Eric Ellison
> > > Sent: Sunday, March 05, 2006 4:17 AM
> > > To: pvharman at arach.net.au; 'Philip Covington'
> > > Cc: 'High Performance Software Defined Radio Discussion List'
> > > Subject: Re: [hpsdr] [ATLAS] - proposed physical bus/pcb design
> > > 03March2006
> > >
> > > ***** High Performance Software Defined Radio Discussion List *****
> > >
> > > Phil
> > >
> > > Your design is so wonderfully flexible, in all ways, it seems a shame
> that
> > > we should not be able to accommodate the two current standard
connectors
> > > in
> > > some way, without having to hack the power supply. That would probably
> > > give
> > > us 10 years, looking at the cycle for the 20 pin connector, change to
> 24.
> > >
> > > On board jumpers? Chris' suggestion of 2 connector provision?
> > >
> > > Thanks
> > > Eric
> > >
> > >
> > > -----Original Message-----
> > > From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On
Behalf
> > > Of
> > > pvharman at arach.net.au
> > > Sent: Saturday, March 04, 2006 10:44 PM
> > > To: Philip Covington
> > > Cc: High Performance Software Defined Radio Discussion List
> > > Subject: Re: [hpsdr] [ATLAS] - proposed physical bus/pcb design
> > > 03March2006
> > >
> > > ***** High Performance Software Defined Radio Discussion List *****
> > >
> > > All,
> > >
> > > I appreciate that we have been through this design loop before but my
> vote
> > > is
> > > that we don't use either connector. A simple Molex socket with just
the
> > > number
> > > of pins that we need will future-proof the project for the day when
the
> > > ATX
> > > connectors change again. Making an adapter/chopping leads is easy.
> > >
> > > I appreciate that with the ATX connector we can remotely switch the
PSU
> > > on/off
> > > but hooking into those two pins is easy.
> > >
> > > Just my 2c worth.
> > >
> > > 73's Phil...VK6APH
> > >
> > >
> > >
> > >
> > >
> > > Quoting Philip Covington <p.covington at gmail.com>:
> > >
> > >> ***** High Performance Software Defined Radio Discussion List *****
> > >>
> > >> Hi Chris,
> > >>
> > >> Thanks for the link to the spec and the data sheet.
> > >>
> > >> Ken N9VV also sent me a link to the ATX 2.2 spec which describes the
> > >> 24 pin connector.
> > >>
> > >> I guess the big question now is whether we should stick with the 20
> > >> pin connector, go with the 24 pin connector, or put both on the
board?
> > >>
> > >> I am in the process of adding the daisy chain bus requested by Lyle
so
> > >> I can change or modify the connector arrangement also. With 3 lines
> > >> on the XBUS and 3 lines on the YBUS used for the daisy chain, that
> > >> leaves us with an XBUS of 24 lines and a YBUS of 24 lines. I did
not
> > >> like the connector reference designator progression either so I have
> > >> fixed that.
> > >>
> > >> 73 de Phil N8VB
> > >>
> > >>
> > >> On 3/4/06, Christopher T. Day <CTDay at lbl.gov> wrote:
> > >> > Phil,
> > >> >
> > >> > My attached message gives the Mouser part number I found for the
> 24-pin
> > >> > version. I found it by looking for a match to what is specified for
> the
> > >> > plug in the ATX V2.2 Motherboard spec
> > >> > <http://www.formfactors.org/developer/specs/atx2_2.pdf>. Here is
the
> > >> > data sheet for the header on the Mouser site:
> > >> > <http://www.molex.com/pdm_docs/sd/039281243_sd.pdf>. Is this enough
> > >> > info?
> > >> >
> > >> > Unfortunately, I think this header is not pin compatible with the
> > >> > 20-pin
> > >> > version; the latch is in the wrong place and the pin across from #8
> is
> > >> > NC instead of -5VDC as specified for the 20-pin connector in the
ATX
> > >> > v2.1 spec
> > >> > <http://www.formfactors.org/developer/specs/atx2_1.pdf>
> > >> > I now have the picoPSU supply which is not modifiable to 24-pins,
so
> > >> > I'd
> > >> > be happy with the Atlas board as is.
> > >> >
> > >> >
> > >> > Chris
> > >> >
> > >> >
> > >> > -----Original Message-----
> > >> > From: Philip Covington [mailto:p.covington at gmail.com]
> > >> > Sent: Saturday, March 04, 2006 3:22 PM
> > >> > To: High Performance Software Defined Radio Discussion List
> > >> > Subject: Re: [hpsdr] [ATLAS] - proposed physical bus/pcb design
> > >> > 03March2006
> > >> >
> > >> > ***** High Performance Software Defined Radio Discussion List *****
> > >> >
> > >> > On 3/4/06, Eric Ellison <ecellison at comcast.net> wrote:
> > >> > > Phil
> > >> > >
> > >> > > Fantastic. Many great ideas here. I really like the inclusion of
> all
> > >> > > voltages for experimenters! We had talked about using the new 24
> pin
> > >> > ATX
> > >> > > connector which is apparently compatible with the current 20 pin
> > >> > connector.
> > >> > > This would allow for the future of the newer power supplies
> included
> > >> > with
> > >> > > future computer enclosures.
> > >> > >
> > >> > > Are you doing this in Kicad? If so can we get a holt of the
project
> > >> > files?
> > >> > >
> > >> > > Thanks
> > >> > > Eric
> > >> >
> > >> > Hi Eric,
> > >> >
> > >> > I could not find a specification or reliable source of information
> > >> > concerning the pin out of the 24 pin connector mentioned. Anyone?
> > >> >
> > >> > 73 de Phil C
> > >> > _______________________________________________
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> > >> >
> > >> >
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