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Community Bench Meter
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_Sync_:
After reading a bit, I think that we might get around using this chip for a start, it should provide satisfactory accuracy.
I'm still reading into integrating ADCs, but it seems that getting reliable results will require quite some effort. I will start experimenting as soon as I get the FPGA project for school done... :)

I'll keep you posted, if I get some progress!
alm:

--- Quote from: _Sync_ on February 05, 2010, 02:35:46 pm ---After reading a bit, I think that we might get around using this chip for a start, it should provide satisfactory accuracy.
--- End quote ---
From a quick glance at the datasheet, this device doesn't seem much better than the ICL7106 used by all cheap multimeters, just 2000 counts (decimal).


--- Quote from: _Sync_ on February 05, 2010, 02:35:46 pm ---I'm still reading into integrating ADCs, but it seems that getting reliable results will require quite some effort. I will start experimenting as soon as I get the FPGA project for school done... :)
--- End quote ---
Building a high-accuracy ADC is probably quite hard. If we have to use an off-the-shelf ADC, there are plenty available with a higher resolution. A quick parametric search at Digikey shows several 24-bit ADC's below $10 (eg. AD7192), although getting 24 bits of usable data out of them won't be easy either. Not sure what the important specs in this application are, it may well be that what required a custom circuit in the eighties can be easily solved with modern parts.

Alson
_Sync_:
Well the designs don't use regular ADCs because they are quite unstable and not very accurate in the low bit levels.

Yep, the chip isn't that accurate, I just had a quick looks in a coding break earlier.

I'll see what I can achieve with some crude design and then refine from there ;)
walterdelbono:
 :o  ...woooooooooooooooooooooooooooooooooooooooooooooooooooooow...  :o

what an awesome topic god saint...

first of all i want to thank everybody for the information this topic is amazing...

i hope you finish this project some how because i think that it is one of the most wonderful things i found in internet...

and i want to build my own "eevblog community bench meter"

good luck...

:)

SockThief:
Hej everyone,

been a bit busy lately, so ive not been here much, and so i appologise if this has already been posted, but its well worth a look anyway

http://www.gadgetfactory.net/gf/project/butterflylogic/

cheers
SockThief
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