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Logic Analyzers
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Please be positive and constructive with your questions and comments.

Re: Logic Analyzers

by charliex on Sat Nov 28, 2009 5:58 pm

What are you using it for ?

Ebay cheap agilent or HP
SUMP FPGA Logic analyser + omla32 http://www.sump.org/projects/analyzer/ http://oakmicros.com/content/omla32-Log ... -Card.html (increases voltage range)
Jack / Gadget Factories version of the Sump http://www.gadgetfactory.net/gf/project/lax/
http://032.la - Null Space Labs.
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Re: Logic Analyzers

by george_graves on Mon Feb 15, 2010 7:02 pm

I'm going to pick up one of these:

http://www.saleae.com/home/

But in the mean time - I use a parallel port LA that I built using just a buffer chip and some free software I found online.

Google "parallel port logic analyzer" and there will be lots of info.
New blog - www.digitalunderpants.com

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Re: Logic Analyzers

by Entropy on Tue Feb 16, 2010 10:51 am

charliex wrote:What are you using it for ?

Ebay cheap agilent or HP
SUMP FPGA Logic analyser + omla32 http://www.sump.org/projects/analyzer/ http://oakmicros.com/content/omla32-Log ... -Card.html (increases voltage range)
Jack / Gadget Factories version of the Sump http://www.gadgetfactory.net/gf/project/lax/

Jack is working with Ian Lesnet of Dangerous Prototypes on a more sophisticated yet cheaper variant of the SUMP with onboard config memory for the FPGA. They have boards, they're working on tweaking the FPGA for the new board and developing the USB microcontroller firmware. I'm holding off on LA purchases until that project finalizes.
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Re: Logic Analyzers

by charliex on Tue Feb 16, 2010 12:42 pm

Yes i've been following the progress on it, it looks promising.

I'm pretty happy with my sump+omla , intronix logicport and cheap ebay HP 1650A, anything they can't do i likely can't afford something that can ;)
http://032.la - Null Space Labs.
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Re: Logic Analyzers

by rct on Fri Feb 19, 2010 10:46 am

This might be totally off base, (too low end) but the Propscope USB oscilloscope from Parallax (approx $249) has an 4 channel logic analyzer.

http://www.parallax.com/Store/Microcont ... fault.aspx

I don't have one but I've been considering it as a first oscilloscope purchase. It's built on the Propeller platform so it offers lots of possibilities for further hacking.

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Re: Logic Analyzers

by sirket on Fri Feb 19, 2010 5:03 pm

rct wrote:This might be totally off base, (too low end) but the Propscope USB oscilloscope from Parallax (approx $249) has an 4 channel logic analyzer.

http://www.parallax.com/Store/Microcont ... fault.aspx

I don't have one but I've been considering it as a first oscilloscope purchase. It's built on the Propeller platform so it offers lots of possibilities for further hacking.

The only problem is that for $100 less you can get an 8 channel analyzer from Salae- enough for a basic 8 bit bus.
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Re: Logic Analyzers

by rct on Sat Feb 20, 2010 10:45 am

sirket wrote:The only problem is that for $100 less you can get an 8 channel analyzer from Salae- enough for a basic 8 bit bus.


Sorry for being unclear, I didn't mean to compare that to a dedicated logic analyzer, rather I'm looking at the propeller as a potential first instrument for a hobbyist since I don't have a scope. The Salae looks pretty nice. I'll keep it in mind if I ever get that far.

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Re: Logic Analyzers

by sirket on Sat Feb 20, 2010 11:17 am

rct wrote:
sirket wrote:The only problem is that for $100 less you can get an 8 channel analyzer from Salae- enough for a basic 8 bit bus.


Sorry for being unclear, I didn't mean to compare that to a dedicated logic analyzer, rather I'm looking at the propeller as a potential first instrument for a hobbyist since I don't have a scope. The Salae looks pretty nice. I'll keep it in mind if I ever get that far.

Fair enough. The problem with a scope like the Parallax is that they are a compromise. You get a lesser scope and a lesser logic analyzer. For the same $250 you can buy the Salae, and score a reasonable old Tektronix scope off eBay and you'll get a lot more for your money.

A lot of the decision comes down to what you intend to work with. Oscilloscopes are more more useful for audio and radio electronics. If all you are going to be doing is working with digital signals then sticking with a simple logic analyzer won't hurt you except in oddball cases. Many people do a lot of electronics work without a scope or logic analyzer.
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Please be positive and constructive with your questions and comments.