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From: John Larkin on 24 Jul 2010 20:29 I spent most of the day building this. ftp://jjlarkin.lmi.net/V220_Test_Front.jpg ftp://jjlarkin.lmi.net/V220_Test_Back.jpg which is a fixture to help test/cal a new VME module. It's powered by a 48-volt wall wart. Those old-fashioned teevee type terminal strips, and rotary switches, are pretty cool. This really deserves a more macho knob, but that's all I could find around the place without stealing one from something in the antique collection. The thing it connects to has 13 ARM processors and one FPGA on the board. Time warp. ftp://jjlarkin.lmi.net/V220_top.jpg John
From: Grant on 24 Jul 2010 21:20 On Sat, 24 Jul 2010 17:29:11 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >I spent most of the day building this. > >ftp://jjlarkin.lmi.net/V220_Test_Front.jpg > >ftp://jjlarkin.lmi.net/V220_Test_Back.jpg > >which is a fixture to help test/cal a new VME module. It's powered by >a 48-volt wall wart. Those old-fashioned teevee type terminal strips, >and rotary switches, are pretty cool. This really deserves a more >macho knob, but that's all I could find around the place without >stealing one from something in the antique collection. > >The thing it connects to has 13 ARM processors and one FPGA on the >board. Time warp. > >ftp://jjlarkin.lmi.net/V220_top.jpg One thing I don't miss are the tag strips ;) Would've glued a bit of blank PCB behind the panel and buzzed a pattern with diamond bit for those few components. No screws in front panel then ;') Bet you're glad to be moving those new V220 whatsits out the door? Grant.
From: Joerg on 25 Jul 2010 17:39 John Larkin wrote: > I spent most of the day building this. > > ftp://jjlarkin.lmi.net/V220_Test_Front.jpg > > ftp://jjlarkin.lmi.net/V220_Test_Back.jpg > > which is a fixture to help test/cal a new VME module. It's powered by > a 48-volt wall wart. Those old-fashioned teevee type terminal strips, > and rotary switches, are pretty cool. This really deserves a more > macho knob, but that's all I could find around the place without > stealing one from something in the antique collection. > > The thing it connects to has 13 ARM processors and one FPGA on the > board. Time warp. > > ftp://jjlarkin.lmi.net/V220_top.jpg > Do I see three tantalums on the bottom right? Oh-oh ... :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: krw on 25 Jul 2010 17:41 On Sun, 25 Jul 2010 14:39:46 -0700, Joerg <invalid(a)invalid.invalid> wrote: >John Larkin wrote: >> I spent most of the day building this. >> >> ftp://jjlarkin.lmi.net/V220_Test_Front.jpg >> >> ftp://jjlarkin.lmi.net/V220_Test_Back.jpg >> >> which is a fixture to help test/cal a new VME module. It's powered by >> a 48-volt wall wart. Those old-fashioned teevee type terminal strips, >> and rotary switches, are pretty cool. This really deserves a more >> macho knob, but that's all I could find around the place without >> stealing one from something in the antique collection. >> >> The thing it connects to has 13 ARM processors and one FPGA on the >> board. Time warp. >> >> ftp://jjlarkin.lmi.net/V220_top.jpg >> > >Do I see three tantalums on the bottom right? Oh-oh ... :-) Your replacement is?
From: John Larkin on 25 Jul 2010 17:53
On Sun, 25 Jul 2010 14:39:46 -0700, Joerg <invalid(a)invalid.invalid> wrote: >John Larkin wrote: >> I spent most of the day building this. >> >> ftp://jjlarkin.lmi.net/V220_Test_Front.jpg >> >> ftp://jjlarkin.lmi.net/V220_Test_Back.jpg >> >> which is a fixture to help test/cal a new VME module. It's powered by >> a 48-volt wall wart. Those old-fashioned teevee type terminal strips, >> and rotary switches, are pretty cool. This really deserves a more >> macho knob, but that's all I could find around the place without >> stealing one from something in the antique collection. >> >> The thing it connects to has 13 ARM processors and one FPGA on the >> board. Time warp. >> >> ftp://jjlarkin.lmi.net/V220_top.jpg >> > >Do I see three tantalums on the bottom right? Oh-oh ... :-) Yes. LM1117's like tantalums on their outputs; the ESR is just right, and will hold up at -20C. They are all 22u, 10v, 11 cents each, on the outputs of 3.3, 2.5, and 1.25 volt regulators. That should be safe. Why make rules if you can't break them once in a while? The 1.25 is FPGA core voltage; that's an LM1117 with its adj pin grounded. The 2.5 is FPGA VCCaux, another LM1117 with its adj pin tied to the 1.25 rail. I would happily show the programming resistor values, except there aren't any. John |