[sdiy] IR3109 (OTA-based) filter question

[patchell]

mark verbos wrote:

>
> the problem lies in powering them. You need to make a +/- 7.5volt supply just
> for the switching chips.
>
> The Buchla solution was the LF13331 switching chip. They can be powered from +/-
> 15 and will switch from almost anything ( threshold at 2 volts). There are 4
> switches in one 16 pin package.
>
> These are really hard to find these days and quite expensive if you do. There is
> also the DG201/202 and DG441/442. Any of these would be suitable for your
> application.
>
> These may all be overkill, but they are the best part for the job.
>

    I agree with using the DG201 type part.  Another to consider is the DG211.
Although, this part requires in addition to the +/-15 volts, a + 5 volt supply as
well.  They are not all that expensive, only about 4 times the CA4016/66.

>
> --
> mark verbos
>
> "if you want something done right, build it yourself."
>
> verbos at simple-answer.com
> www.simple-answer.com
>
> watch out for...
> on my label SIMPLE ANSWER "World of Illusion" Simple Answer 003 and "Mechanical
> Process" Simple Answer 004 out now. now distributed by Integrale, UK
>
> also...
> "Basic Concept" on Djax-Up-Beats and "Dead and Burried" on Dosed
> I have moved to Berlin!

--
 -Jim
------------------------------------------------
* Visit:http://www.silcom.com/~patchell/
*-----------------------------------------------
*I'm sure glad Merry Christmas comes just once a year
* -Yogi Yorgensen
------------------------------------------------