Warning: DIY content.
If you are planning to build the DIY 822 2-IN 2-OUT voltage shifter, the
documentation is currently available on-line if you want to go peek. The
panel, parts list, schematics, and a series of photos showing the
construction stages of the first one are all out there.
For those of you who already have the 831 information, I am currently
updating the 831 3-IN 3-OUT voltage shifter documentation and putting it on
line also. I am updating the schematics to have ALL the values ON the
schematic. The parts list has been updated to make it clearer. And, I
changed 3 resistor values from the original list (schematic page 3, parts
R13, R24, and R35 from 100 K to 180 K). I will have all the 831
information posted soon.
Sorry, but the files are largish (except the panel GIF and MS Word parts
list are small). This private server is on a cable modem, so speed should
not be an issue for those of you lucky enough to have high speed access.
My local phone company "switch" will only pass about 26K. And, their
response to higher speed was "DS what?"
If you are actually going to purchase a panel for this project you do not
have to download all the stuff. I can burn it all to a CD and snail mail it
to you (more on the panels soon I hope). However, the download time
is not that bad.
http://www.modglin.com/larry/jlh-822/822panel.gifhttp://www.modglin.com/larry/jlh-822/822parts-list.dochttp://www.modglin.com/larry/jlh-822/822paper-proto.jpghttp://www.modglin.com/larry/jlh-822/822schematic-1of3.jpghttp://www.modglin.com/larry/jlh-822/822schematic-2of3.jpghttp://www.modglin.com/larry/jlh-822/822schematic-3of3.jpghttp://www.modglin.com/larry/jlh-822/822photo1.jpghttp://www.modglin.com/larry/jlh-822/822photo2.jpghttp://www.modglin.com/larry/jlh-822/822photo3.jpghttp://www.modglin.com/larry/jlh-822/822photo4.jpghttp://www.modglin.com/larry/jlh-822/822photo5.jpghttp://www.modglin.com/larry/jlh-822/822photo6.jpghttp://www.modglin.com/larry/jlh-822/822photo7.jpgThe photos progress through construction. Photo 1 is the bare protobpoard.
Photo 7 is the module completed except for front panel components. If you
have any comments about the circuit or construction layout, I would love to
hear them (including constructive criticism).
I'll post the links to the 831 info tonight or tomorrow.
Larry (still # 2 on the stooge list) Hendry
PS:
Disclaimer: I am not an engineer. The information provided is DIY content
and for DIY fair use only. I am not selling any modules. I guarantee
nothing. I can only confirm that the 831 3-IN 3-OUT voltage shifter circuit
works perfectly as shown. I will have the 822 working this week. But, the
circuits are essentially the same as the 831, so I imagine it will be OK
too.