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 Forum index » DIY Hardware and Software » PAIA Equipment
PAIA 8780 DAC
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anders79



Joined: Jun 21, 2010
Posts: 21
Location: Sweden

PostPosted: Sun Mar 10, 2013 7:47 am    Post subject: PAIA 8780 DAC Reply with quote  Mark this post and the followings unread

Hi!

I'm planning to build the lower part of the PAIA 8780 DAC:

http://rubidium.dyndns.org/cag/pdf/8780.pdf

(schematic on p. 19)


I would like to control a couple of linear VCOs from the parallel port of a PC. The DAC uses a resistor network to get closely matched resistors of the same value, but Randaleem here on electro-music.com claims that extra trimmers are necessary in order to get the whole thing in tune. My question is, could the 12 resistors in the network be replaced with 0.1% tolerance resistors without any additional trimmers?

What would be the most ideal, to buy a modern resistor network (higher standard in today's components compared to the one used in 1978?) or 12 0.1% tolerance resistors?

kind regards
Anders
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johncronan



Joined: Feb 24, 2013
Posts: 42
Location: Chicago

PostPosted: Fri Mar 15, 2013 6:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

It looks to me like that circuit uses a custom resistor network IC, not one of the usual topologies. Do you know the values?
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