Low frequency analog VCO with sinewave output?

I'm searching for a simple one chip solution if anyone has any ideas.
Best I've found so far might be the old 8038 function generator chip.

On a sunny day (Wed, 24 Aug 2011 02:22:29 -0700 (PDT)) it happened davew
<david.wooff@gmail.com> wrote in
<aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com>:

>I'm searching for a simple one chip solution if anyone has any ideas.
>Best I've found so far might be the old 8038 function generator chip.

There was this 22?? sort of chip that does triangle and sine.
Used, it, if I only could remember the number...
:-)

"dave wanker"


** FFS  -  define " low frequency "'

 We are not fucking mind readers  !!!!!!!!!

 You stupid POS.





....  Phil

On Aug 24, 12:55=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:
> "dave wanker"
>
> ** FFS =A0- =A0define " low frequency "'
>
> =A0We are not fucking mind readers =A0!!!!!!!!!
>
> =A0You stupid POS.
>
> .... =A0Phil

Well you should have got a clue from 8038 but there you go.  Audio
band is what I'm interested in.

> "dave the fuckwit wanker"
>
> ** FFS - define " low frequency "'
>
> We are not fucking mind readers !!!!!!!!!
>
> You stupid POS.
>

Well you should have ...


** You should have been aborted.


Audio band is what I'm interested in.


** Now you tell us.

  You stupid, bullshitting PITA cunthead

  FOAD



... Phil

On Wed, 24 Aug 2011 10:03:51 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

>On a sunny day (Wed, 24 Aug 2011 02:22:29 -0700 (PDT)) it happened davew
><david.wooff@gmail.com> wrote in
><aff45f3b-ff96-4d35-b3e0-d53ed85225dc@d25g2000yqh.googlegroups.com>:
>
>>I'm searching for a simple one chip solution if anyone has any ideas.
>>Best I've found so far might be the old 8038 function generator chip.
>
>There was this 22?? sort of chip that does triangle and sine.
>Used, it, if I only could remember the number...
>:-)

EXAR XR2209

-- 
JF

On Aug 24, 1:11=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:
> > "dave the fuckwit wanker"
>
> > ** FFS - define " low frequency "'
>
> > We are not fucking mind readers !!!!!!!!!
>
> > You stupid POS.
>
> Well you should have ...
>
> ** You should have been aborted.
>
> Audio band is what I'm interested in.
>
> ** Now you tell us.
>
> =A0 You stupid, bullshitting PITA cunthead
>
> =A0 FOAD
>
> ... Phil

Any ideas Phil?  You come across as an ideas man to me.

"dave the fuckwit wanker"

>
> > ** FFS - define " low frequency "'
>
> > We are not fucking mind readers !!!!!!!!!
>
> > You stupid POS.
>
> Well you should have ...
>
> ** You should have been aborted.
>
> Audio band is what I'm interested in.
>
> ** Now you tell us.
>
> You stupid, bullshitting PITA cunthead
>
> FOAD
>


Any ideas Phil?


** Go fuck your mother   -   again.

   Before that donkey has another go.

On Aug 24, 7:22=A0pm, davew <david.wo...@gmail.com> wrote:
> I'm searching for a simple one chip solution if anyone has any ideas.
> Best I've found so far might be the old 8038 function generator chip.

If you are restricted to one chip, this is probably as good as it
gets. It distorts a triangular wave to a tolerable approximation to a
sine wave.

You can do better by feeding a square wave through a shift register
clock at some convenient multiple of the square wave frequency, tying
a series of resistors to the outputs of the shift register and summing
the currents through the resistors into a virtual earth to produce a
staircase approximation to a sine wave, but it takes quite a long
shift register and quite a few close tolerance resistors to do better
than the 8038, and  it's still a three chip solution - basically a
programmable logic device to provide the shift register and the
dividers to generate the square wave, the VCO to to generate the clock
at some fairly high multiple of the output frequency, and an op amp to
sum the currents from the resistors, plus you have to find board space
for the resistors.

The Analog Devices DDS chips do provide a very good one chip solution
- the more expensive chips include 14-bit DACs - but it isn't an
analog solution.

--
Bill Sloman, Nijmegen

On Aug 24, 1:14=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:
> "dave the fuckwit wanker"
>
>
>
>
>
>
>
> > > ** FFS - define " low frequency "'
>
> > > We are not fucking mind readers !!!!!!!!!
>
> > > You stupid POS.
>
> > Well you should have ...
>
> > ** You should have been aborted.
>
> > Audio band is what I'm interested in.
>
> > ** Now you tell us.
>
> > You stupid, bullshitting PITA cunthead
>
> > FOAD
>
> Any ideas Phil?
>
> ** Go fuck your mother =A0 - =A0 again.
>
> =A0 =A0Before that donkey has another go.- Hide quoted text -
>
> - Show quoted text -