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#1
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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. Regards, Joerg http://www.analogconsultants.com |
#3
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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 |
#4
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"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 |
#5
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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 |
#6
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"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? |
#7
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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 ------------------------------------------------------ |
#8
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"Joerg" wrote in message om... 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. Back in the early '70s I got some prototype boards from a company that made aircraft receivers. They used four push-in pins, one for each lead of the four corners of the IC. Two of these are usually power and ground, pins 7 or 8 and 14 or 16. These four hold the chip up off the board, and the other pins are wired spaghetti style, which I presume is the same as your sauerkraut style. Speaking of this.. Last Sunday at our monthly compouter club meeting someone donated a homemade S-100 system to the consignment table, but no one bought it, so it ended up on the freebies table later, probably then into the trash later. It had a chassis and box pop riveted together, and the S-100 bus was all wire wrapped. A lotta love and time went into building that way back in the late '70s. Regards, Joerg http://www.analogconsultants.com |
#9
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Hello Watson,
Back in the early '70s I got some prototype boards from a company that made aircraft receivers. They used four push-in pins, one for each lead of the four corners of the IC. Two of these are usually power and ground, pins 7 or 8 and 14 or 16. These four hold the chip up off the board, and the other pins are wired spaghetti style, which I presume is the same as your sauerkraut style. Neat. Yes, sauerkraut style is similar to spaghetti style. No meat sauce though ;-) Speaking of this.. Last Sunday at our monthly compouter club meeting someone donated a homemade S-100 system to the consignment table, but no one bought it, so it ended up on the freebies table later, probably then into the trash later. It had a chassis and box pop riveted together, and the S-100 bus was all wire wrapped. A lotta love and time went into building that way back in the late '70s. Oh, wire wrap. Most older computers were that way in the 70's when I was at university. It caused a lot of grief but then I found out an upside. As a student you are always short of money, looking for an opportunity to make a buck. These old wire wrap graves still would have some life in them but not enough for the institutes to warrant the huge service contract expenses or $200/hour repairs. So they just sat there, dead. Then I offered to repair them provided I could do it my way. Brought the big solder iron and soldered the whole backplane which brought them back to life. They actually ran more reliably then ever, some told me. Often the pay wasn't money but a keg and pizza which was then immediately consumed by me and some staff on the lawn in front of the place. Regards, Joerg http://www.analogconsultants.com |
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