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What's with the DPRB?

J

Jim Thompson

Jan 1, 1970
0
What's with the DPRB? ("Democratic People's Republic of Berkeley")

It would solve lots of problems if we simply gave California back to
Mexico before they Californicate the whole nation.

...Jim Thompson
 
What's with the DPRB? ("Democratic People's Republic of Berkeley")

It would solve lots of problems if we simply gave California back to
Mexico before they Californicate the whole nation.

Alternatively, one might give Arizona and Texas back to the Mexicans.
If Jim and Dubbya are to be taken as representative of their states,
this is a gesture that would probably double the average IQ of the
residual United States, when compared with the average that included
these two states.

We are talking about seriously negative IQs here - a near anti-genius
capacity for mis-analyisig a situation and coming to the worst
possible conclusion. Invading Irak was probably a worse idea than
giving California back the the Mexicans, but both are spectacularly
idiotic.
 
R

Rich Webb

Jan 1, 1970
0
What's with the DPRB? ("Democratic People's Republic of Berkeley")

It would solve lots of problems if we simply gave California back to
Mexico

Only if they'll also take Texas.
 
J

Jim Thompson

Jan 1, 1970
0
Only if they'll also take Texas.

What's wrong with Texas?

My only complaint about Texas is that the people are so friendly that
you can't get thru a check-out line quickly due to everyone chatting
and striking up new acquaintances ;-)

...Jim Thompson
 
R

Richard The Dreaded Libertarian

Jan 1, 1970
0
What's with the DPRB? ("Democratic People's Republic of Berkeley")

It would solve lots of problems if we simply gave California back to
Mexico before they Californicate the whole nation.

Nah, just send the Bushists/Cheneyists to Iraq, Afghanistan, Pakistan,
and so on, so that they can participate in the invasion(s) they all seem
to be so fond of.

Thanks,
Rich
 
J

John Larkin

Jan 1, 1970
0
What's with the DPRB? ("Democratic People's Republic of Berkeley")

It's the Bum's Republic of Berkeley now. It's gotten so bad on
Telegraph Street that people are staying away and shops are closing.

Leftism is self-limiting!
It would solve lots of problems if we simply gave California back to
Mexico before they Californicate the whole nation.

...Jim Thompson

We just had lunch on Castro Street in San Francisco. There was a
vigorous confrontation, a Hillary group facing down an Obama group,
jamming the sidewalk corner and waving signs in one another's faces.
No serious injuries.

They've repainted the Castro Theater, an art deco gem, to look like it
did in the late 70's. They're filming a movie on the street, about
Harvey Milk and the assassinations.



Hey, a new box:

ftp://66.117.156.8/P730.jpg

ftp://66.117.156.8/P730.gif

It's a logic fanout. Two electrical inputs, two optical inputs, 8
outputs in two banks of 4, with routing and adjustable levels all
around. We're hoping to run at 1 GHz.

John
 
M

Martin Griffith

Jan 1, 1970
0
Hey, a new box:

ftp://66.117.156.8/P730.jpg

ftp://66.117.156.8/P730.gif

It's a logic fanout. Two electrical inputs, two optical inputs, 8
outputs in two banks of 4, with routing and adjustable levels all
around. We're hoping to run at 1 GHz.

John
neat,how many layers?
Did you do the layout?


martin
 
J

John Larkin

Jan 1, 1970
0
neat,how many layers?

Six. The circuitry is pretty simple. All the fast stuff is on layer 1,
and the miscellaneous signals are on 6. Ground is 2. The other layers
are all power pours.
Did you do the layout?

Three of us worked on the pcb layout. I did the fast stuff... still
tweaking it in fact. My cad guy did the basic board setup and the
pours (he's great at pours) and will do the formal release and
gerbers. One of my engineers designed and layed out the power supplies
on the right. Another one of my guys worked out the optical receiver
stuff.

My production manager is also a great mechanical designer. We looked
around for standard boxes, but nothing was right, so he designed this
to be custom fabbed from sheet metal. It will be cheaper than a
standard enclosure, which seems silly. The pic is from SolidWorks.

The front and back will have polycarb label/overlays. Nowadays they're
digital printed in unlimited colors (not screened) and laser cut (not
steel rule die) so we can go crazy on graphics.

The next spin, once we get this to work, will dump the switches and
trimpots for a uP with dacs, and add time trims per output.

The goofy looking run upper-left is an impedance test trace. I'll TDR
it on a bare board to see how things came out. The two square SMA's
are for experimenting with plane impedances and noise, just for fun.

John
 
J

JeffM

Jan 1, 1970
0
Yeah. That *egalitarianism* thing is so 1972
and that Utilitarian Rule is so unworkable.
Nah, just send the Bushists/Cheneyists to Iraq, Afghanistan, Pakistan,
and so on, so that they can participate in the invasion(s) they all seem
to be so fond of.

You almost quoted the sage.
"All the war-propaganda, all the screaming and lies and hatred,
comes invariably from people who are not fighting."
--George Orwell
 
M

Martin Griffith

Jan 1, 1970
0
Six. The circuitry is pretty simple. All the fast stuff is on layer 1,
and the miscellaneous signals are on 6. Ground is 2. The other layers
are all power pours.


Three of us worked on the pcb layout. I did the fast stuff... still
tweaking it in fact. My cad guy did the basic board setup and the
pours (he's great at pours) and will do the formal release and
gerbers. One of my engineers designed and layed out the power supplies
on the right. Another one of my guys worked out the optical receiver
stuff.

My production manager is also a great mechanical designer. We looked
around for standard boxes, but nothing was right, so he designed this
to be custom fabbed from sheet metal. It will be cheaper than a
standard enclosure, which seems silly. The pic is from SolidWorks.

The front and back will have polycarb label/overlays. Nowadays they're
digital printed in unlimited colors (not screened) and laser cut (not
steel rule die) so we can go crazy on graphics.

The next spin, once we get this to work, will dump the switches and
trimpots for a uP with dacs, and add time trims per output.

The goofy looking run upper-left is an impedance test trace. I'll TDR
it on a bare board to see how things came out. The two square SMA's
are for experimenting with plane impedances and noise, just for fun.

John
Thanks, can I ask what the 2 versions of Lombard Street are, going to
S2, S3, timing would be my first guess


martin
 
J

John Larkin

Jan 1, 1970
0
Thanks, can I ask what the 2 versions of Lombard Street are, going to
S2, S3, timing would be my first guess

Trying to equalize prop delays. This is better:

ftp://66.117.156.8/P730_16.gif

It's almost done. Tweaking trace lengths gets tiring after a while.

John
 
W

Winfield

Jan 1, 1970
0
John said:
Trying to equalize prop delays. This is better:
ftp://66.117.156.8/P730_16.gif
It's almost done. Tweaking trace lengths gets tiring after a while.

It's hard to see what's going on, with all
those horizontal lines in your .gif image.
 
J

John Larkin

Jan 1, 1970
0
It's hard to see what's going on, with all
those horizontal lines in your .gif image.

Those are unreal/artifact slits in the power pours that let you sort
of see how the layers are arranged. I think they're colorful.
Actually, the gif resolution is just about good enough to figure out
what we're doing.

Show us one of your boards.

John
 
W

Winfield Hill

Jan 1, 1970
0
John said:
Those are unreal/artifact slits in the power pours that let you sort
of see how the layers are arranged. I think they're colorful.
Actually, the gif resolution is just about good enough to figure out
what we're doing.

Show us one of your boards.

OK, something simple, a pcb with an Analog
Devices DDS to 16 outputs (via relays) for a
Smithsonian Observatory gravity experiment.
ftp://ftp.rowland.org/pub/hill/pics/RIS-564_pcb.gif
This was designed before I discovered the
appeal of mounting parts on both sides of
the pcb.
 
M

Martin Griffith

Jan 1, 1970
0
OK, something simple, a pcb with an Analog
Devices DDS to 16 outputs (via relays) for a
Smithsonian Observatory gravity experiment.
ftp://ftp.rowland.org/pub/hill/pics/RIS-564_pcb.gif
This was designed before I discovered the
appeal of mounting parts on both sides of
the pcb.
Here is a piece of junk I made


I always have a piece of stip board with a zif socket for an 8051
around, this one still works after 10 years


martin
 
J

Joerg

Jan 1, 1970
0
Winfield said:
OK, something simple, a pcb with an Analog
Devices DDS to 16 outputs (via relays) for a
Smithsonian Observatory gravity experiment.
ftp://ftp.rowland.org/pub/hill/pics/RIS-564_pcb.gif
This was designed before I discovered the
appeal of mounting parts on both sides of
the pcb.


Hey, why is nobody using rounded traces anymore? I mean, CAD can do that
automatically these days.
 
J

John Larkin

Jan 1, 1970
0
OK, something simple, a pcb with an Analog
Devices DDS to 16 outputs (via relays) for a
Smithsonian Observatory gravity experiment.
ftp://ftp.rowland.org/pub/hill/pics/RIS-564_pcb.gif
This was designed before I discovered the
appeal of mounting parts on both sides of
the pcb.

Interesting. I always like to see other peoples' styles and stuff. The
Christmas Tree primary color scheme is a bit startling; we prefer
tasteful pastels.

Are the RY things relays? We use "K".

We try to avoid putting a lot of parts on the bottom, but often it's
unavoidable. Having all the bottom parts be the same value, ie
bypasses, isn't too bad. We haven't done bga's on both sides, but I
have seen it done. Shudder.


Hey, we just got one of the newish Stanford Research clock generators,
the 2 GHz thing. It looks pretty good, and we got the prbs option to
test our fanout boxes. What's really unusual is that their instrument
manuals come with complete schematics and BOMs, and a component-level
theory of operation. The schematics are nicely commented with design
notes and explanations. You don't see that much any more.

John
 
J

John Larkin

Jan 1, 1970
0
Hey, why is nobody using rounded traces anymore? I mean, CAD can do that
automatically these days.

Looks Victorian. Soooo last millenium.

John
 
J

Joerg

Jan 1, 1970
0
John said:
Interesting. I always like to see other peoples' styles and stuff. The
Christmas Tree primary color scheme is a bit startling; we prefer
tasteful pastels.

Are the RY things relays? We use "K".

K for kontactor?

The best I've seen was V for transistors. That was really retro.

We try to avoid putting a lot of parts on the bottom, but often it's
unavoidable. Having all the bottom parts be the same value, ie
bypasses, isn't too bad. We haven't done bga's on both sides, but I
have seen it done. Shudder.


Hey, we just got one of the newish Stanford Research clock generators,
the 2 GHz thing. It looks pretty good, and we got the prbs option to
test our fanout boxes. What's really unusual is that their instrument
manuals come with complete schematics and BOMs, and a component-level
theory of operation. The schematics are nicely commented with design
notes and explanations. You don't see that much any more.

I've used some of their stuff in the Bay Area. What really surprised me
was that their prices were not sky-high, in fact they were quite modest.
 
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