cheap data aq system

[Charles Brooks]

How about posting it to the FTP site under a file name like cheap_daq or something similar?

Try to find a book on operational amplifiers (op-amps) and a handful of of 741 op-amps for signal conditioning and isolation. They're very cheap, easy to work with and have gain up to around 10k or so for use with thermocouples and the like. You'll still have to do the linearization via software but it's a BIG help in improving the resolution for low level signals.

Watch for ground loops, and try to use a well regulated power supply. Both of those have bit me in the kiester before :)

Charles Brooks
Mid-Atlantic Speed Shop
http://www.massmotorsports.com

---------- Original Message ----------------------------------
From: "Braman Wing" <braman at braymo.net>
Date: Mon, 28 Feb 2000 13:04:54 -0500

>Someone posted a message a couple of days ago about looking for a schematic for a cheap data aq system. I have found a schematic for a 11 channel, 8-bit D-A system with a parallel port interface. It is based on the Motorola MC145050. I got a 486 laptop on Ebay for $50, and the parts were about $20. I am hoping to start prototyping it this week. Since I have very little electronics experience, I expect it to be a challenge, to say the least. however, if it works it will be great, since it is very simple and cheap to build. If anyone is interested, please email me and I will send the schematic and parts list. It would be great to have someone else working on it who knows what they are doing! I have a feeling the design can be improved upon, but I want to at least get it working before I start messing with it too much. If there is any interest and the thing is successful, I might try to have some PC boards made up and do a group buy for the lists. 
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>Braman
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