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open source GPIB adapter

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dazz1:
Hi
Just a tip.
I spent the day assembling 4x usb-gpib adapter. 
My first adapter assembled a few weeks ago had problems with bad joints and solder bridges.  I blame it all on the cat.

This time I pre-tinned the pins for the usb-c connector and the matching pads.
I also pre-tinned the QFN pads and pcb pads.

I smeared solder across the earth/heat pad on the QFN.

This left a Goldilocks amount of solder for the joints.  All good joints and no excess solder to clean away.  The cat is sleeping peacefully.

dazz1:
Hi
A question for those with experience debugging gpib.  Is it still useful to have a breakout board to read the gpib signals??

The reason I ask is because I have HP54645D scope with 16 channel digital logic inputs like this one  https://metalab.at/wiki/Datei:HP54645D.jpg.  If I make a gipb breakout board, I can plug the flat cable into the scope and board.  No fiddly probes.
The same board could be used with a HP logic analyser because they use the same cable.

pdenisowski:

--- Quote from: dazz1 on March 28, 2024, 08:33:47 am ---Hi
A question for those with experience debugging gpib.  Is it still useful to have a breakout board to read the gpib signals??

--- End quote ---

I just bought a commercially made GPIB breakout board.  Am planning to use it this week to debug / analyze some GPIB traffic.

https://tinyurl.com/2s499tar

(Sorry, tried to post link to the pics here on EEVblog and it keeps failing, so posting a shortened link)

Kean:
Can certainly be useful if you need to diagnose weird GPIB issues or debugging your own interface
I made up one of these by Jason aka cellularmitosis

https://github.com/pepaslabs/gpib-spy

dazz1:
Hi
Well it looks like I will be making a break out board, but not like either of the linked designs.

I will make use of the connectors I have in the photo.
I got the Centronics gpib connectors from Aliexpress because they are dirt cheap.  I purchased the HP logic analyser compatible connector to see if it would fit.  It does, that gave me a solution looking for a problem.
I will design a board that will connect directly to an HP logic analyser, that I don't have, or my HP 54645D mixed signal scope that I do have.
The logic probes designated for the HP54xxx series scopes have the probes integrated with the flat cable.  They are rare an expensive. 
I purchased the cable  and probe set that plug together. Easier to find, cheaper and more versatile.

Along with the Centronics connectors, and HP compatible connector I will include pads for a separate header to make it easy to probe individual lines, if ever needed. Probably a feature I would never use but extra pads are a zero cost. 

I will be able to save a configuration in the scope, and just plug and play the break-out board.  The board will still be usable for someone without a logic analyser. 

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