[sdiy] (oops) EN #76 question

[David G Dixon]

I love ladder DACs!  I built an R-2R ladder DAC for my matrix keyboard
circuit, and it works very well.  I just used a few hand-sorted 1% 49.9k and
100k resistors, and it is pretty darned accurate.  Chip resistor arrays
would be perfect for this as well.

 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of bbob
> Sent: Monday, November 26, 2012 4:47 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] (oops) EN #76 question
> 
> tim, are you thinking about replacing those ladder DACs with 
> something more modern?  I've been wondering the same thing... 
> about 50% done w/ a PCB layout for this, and that was one of 
> the outstanding issues to solve...
> 
> b
> 
> On Mon, Nov 26, 2012 at 5:12 PM, Neil Johnson 
> <neil.johnson97 at ntlworld.com> wrote:
> > Tim Ressel wrote:
> >>
> >> I am looking at Electronotes #76 figures 8a and 8b. 8a 
> shows an 8-bit 
> >> dac made from discrete binary-weighted resistors. We've 
> all seen this 
> >> type of dac.
> >>
> >> Figure 8b shows a dac that has gaussian distribution. The 
> thing is, 
> >> this circuit will only produce 8 different levels, as 
> opposed to the
> >> 256 levels of the 8a circuit. Am I missing something here?
> >
> >
> > The google term is "sine-weighted DAC".
> >
> > Neil
> > --
> > Modules and more :: www.cesyg.com
> > Homepage :: www.njohnson.co.uk ::
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