In article ,
says...
Hello Tim,

Just one more thought: I use "living-bug" arrangements almost
exclusively. Every once in a while I cut up some strips so they fit the
most popular "underbellies" of chips. Then I glue the strips onto the
large panel and the chips on top of the strips in a rider's fashion.
Ground connection can be achieved by slightly bending down a pin, the
rest gets wired up Sauerkraut style like usual. When stray capacitance
is critical I take washed wood strips instead of copper clad. Makes for
a really nice excuse to eat another Haagen Dasz.

This avoids having to think in reverse pinout and it often looks nicer,
too. Plus you can still see the "CD4007" on the chip.

Or you can just bend all but the ground pins outward from the base of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

Sometimes I'll use a drop of cynaoacrylate adhesive to hold the chip
into place if there are few or no grounded pins, but it's rarely
necessary.

This also works for SOICs and even TSSOPs, as long as you don't bend the
pins more than once.

-- jm

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http://www.qsl.net/ke5fx
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Hello John,

Or you can just bend all but the ground pins outward from the base of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

But then I won't have an excuse to eat another Haagen Dasz bar :-(

Regards, Joerg

http://www.analogconsultants.com

"Joerg" wrote in message
m...
Hello John,

Or you can just bend all but the ground pins outward from the base
of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

But then I won't have an excuse to eat another Haagen Dasz bar :-(

You don't need an excuse. We give you permission. ;-)

BTW, you can go to Michaels or other hobby/crafts store and buy a whole
handful of ice scream sticks for a couple bucks. You don't have to wash
'em, then. :-P

Every year the Engineering Club has a model bridge building contest.
They make them out of ice scream sticks. They support the ends of the
bridge on some bricks and suspend a bucket from the middle. Then fill
the bucket with sand until CRACK! the bridge crumples. Pretty neat!

You could come on over afterward and get some free slightly used ice
scream sticks. :-)


Regards, Joerg

http://www.analogconsultants.com

Hello Watson,

BTW, you can go to Michaels or other hobby/crafts store and buy a whole
handful of ice scream sticks for a couple bucks. You don't have to wash
'em, then. :-P

HD and Lowes have suitable hardwood strips, too. That is what I use when
it is a client's breadboard.

But these still don't come with vanilla almond chocolate crunch.
However, there is a trailer in front where they sell jumbo cajun links...

Regards, Joerg

http://www.analogconsultants.com

"John Miles" wrote in message
...
In article ,
says...
Hello Tim,

Just one more thought: I use "living-bug" arrangements almost
exclusively. Every once in a while I cut up some strips so they fit
the
most popular "underbellies" of chips. Then I glue the strips onto
the
large panel and the chips on top of the strips in a rider's fashion.
Ground connection can be achieved by slightly bending down a pin,
the
rest gets wired up Sauerkraut style like usual. When stray
capacitance
is critical I take washed wood strips instead of copper clad. Makes
for
a really nice excuse to eat another Haagen Dasz.

This avoids having to think in reverse pinout and it often looks
nicer,
too. Plus you can still see the "CD4007" on the chip.

Or you can just bend all but the ground pins outward from the base of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

Sometimes I'll use a drop of cynaoacrylate adhesive to hold the chip
into place if there are few or no grounded pins, but it's rarely
necessary.

This also works for SOICs and even TSSOPs, as long as you don't bend
the
pins more than once.

-- jm

What's the board in? A receiver? What's it do?

Or you can just bend all but the ground pins outward from the base of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

What's the board in? A receiver? What's it do?

It's a PLL that locks a Tek 492AP spectrum analyzer to an external 10
MHz GPS reference. The box contains an x100 prescaler, x10 prescaler, a
phase/frequency detector made from two halves of a 74LS74, and a slow
loop filter made from an LF356 opamp. There's also a relay that
switches the correction signal in and out of the circuit based on
whether the GPS reference is connected.

The 494 and 494A had the reflock assembly built in, but the 492A didn't.
So I added it, along with a few other tweaks that bring it up to 494A-
level functionality.

Lots of stuff in a very small box, without much room for component
standoffs or other prototyping aids. I've built a ton of stuff that
way, at frequencies up to and including 2 GHz. Wouldn't even consider
any other assembly techniques for RF work at this point.

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------