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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Looks like you managed to skip the board all together?
I really hate to mention that I would have sold you 10 sioc->dip adapters etched in a piece of pcb for like $10... Just need artwork
I never tried putting the pins directly to the chip, I alwys have put them on a little gizmo designed for wirewrap board that looks sorta like a dip chip, but instead of a chip in the middle it just has solder hoops (so you could solder resistors in it to plug into a wirewrap board) with 30awg wire to the pins. I tried to put a little a/d that had pins about the size of a piece of 32awg wire (probably .01" extra) and got almost down with all 20 pins when I broke off the vdd pin I never tried anything after that
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
Check out if you need breakout boards, they have every imaginable style for a buck each. Of course, dosen't look as cool as the potted masterpeice shown, awaiting the write-up!
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Remember that some chips will not work when mounted like that. Always read the datasheet, in some cases the allowable lead lengths are so limited that they can't even reach the breadboard.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
haha.''duplo chips''
Did that board actually work steve?
For IC's that work on very high frequencies breadboard in't good at all, no matter of leg length- high capacitance between pins is much more troubling there.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Ya, it worked. It's an AD9850 DDS chip clocked at 125MHz, so lead lengths etc. were critical. I used double sided board and used the underside as +5v and the top as ground, and drilled holes where I needed 5v. I also soldered a tiny 0603 size SMD bypass cap between each of the DDS chip's power pins and the groundplane.
The long wires you see are for the (relatively slow) control signals coming from a PIC on another board, except for two: one carrying the 125MHz clock and another for the 0-40MHz output. I made sure these were pressed down against the groundplane and they performed fine.
I also built a PRBS generator clocked at 40MHz out of ECL logic using the same technique.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I always wanted to make good PCB's using photo-treatment (or anyway it's called) but never actually done it right, not even close for good SMD-ing so it was pointless. I rather use prefboards for almost anything now.
One improvment I can think for rev's adapter could be using a 'gold plated' socket under the board, possibly having chip soldered to holes on top.
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SOIC on a breadboard??? Yes!!!
I never tried anything after that 
