[sdiy] (oops) EN #76 question

[Dave Manley]

There are dedicated resistor arrays for this purpose.

PAiA even had a special one made for linear vcos a long time ago.  Have one somewhere...

-Dave

-------- Original Message --------
 From: David G Dixon <dixon at mail.ubc.ca>
 Sent: Mon, Nov 26, 2012 04:54 PM
 To: 'bbob' <fluxmonk at gmail.com>; synth-diy at dropmix.xs4all.nl
 CC: 
 Subject: Re: [sdiy] (oops) EN #76 question

>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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