Thanks Aaron, I think I get the picture here. It basically converts a square wave into a sin and cosine. The circles that it creates are divided into 256 small segments, which segments need to be turned on is selected through 8 bits. The segments that do not need to be displayed are blanked out. This is different than what I had in mind, it means that for each arc that needs to be displayed, the circuit will create a complete circle but the unused segments will be blanked out. The DAC is a nice one, I had the idea that a serial input DAC would be too slow for this application but apparently it is not :-). If I need to scale or modulate analog signals, I sometimes use analog multipliers in an op-amp feed back loop so that they operate as an analog divider. That works well and is also very fast but it usually means I need an extra DC/DC converter to go from say 5V input to +/- 12V. I might have a look if I can do something similar with this DAC. I would then still need to place it into a feedback loop as I need to amplify my input signal rather than attenuate.
Michel On Sep 5, 8:47 pm, "[email protected]" <[email protected]> wrote: > Hi Michel, > > Sure - just look at the ERRATA.pdf file inside any of the Minor Revision zip > files (like the Control Board rev 1.01). You will find the 1.00 schematic, > with changes from 1.00->1.01 marked in Red pen. > > Sorry it's not so easy I get at.. > > Aaron > > On 2012/09/05, at 14:56, Michel <[email protected]> wrote: > > > > > > > > > Hi Aaron, > > > Would you mind to post the schematics in a PDF file to download from > > your site? I saw you put the EAGLE files there but I don't use that > > software and I don't just want to install it to view the schematics. > > I'd like to see the circuitry around the circle generator with D/A > > variable gain. > > > Michel > > > -- > > You received this message because you are subscribed to the Google Groups > > "neonixie-l" group. > > To post to this group, send an email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visithttps://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
