square to sine wave help

[isaac]

Thanks for all your replies but i still find it difficult to find a circuit that
would do the conversion from square to sine wave so i am going to use
two wien bridge oscillators to generate the 2 different audio sine waves
that i need and use an analogue switch to select the the individual oscillator
if anyone has done square wave to sine using op amps i would be glad to
to hear from you

Best Regards
Isaac

[mister_e]

look at
http://www.chem.uoa.gr/applets/Apple...xt_OpAmps2.htm
http://www.allaboutcircuits.com/vol_6/chpt_6/6.html
http://webpages.ursinus.edu/lriley/r...html#fig:opint


and ... LMAO!!! a really quik one
http://lhcb-elec.web.cern.ch/lhcb-el...s/00000031.htm

[psdayama]

look at
http://www.chem.uoa.gr/applets/Apple...xt_OpAmps2.htm
http://www.allaboutcircuits.com/vol_6/chpt_6/6.html
http://webpages.ursinus.edu/lriley/r...html#fig:opint


and ... LMAO!!! a really quik one
http://lhcb-elec.web.cern.ch/lhcb-el...s/00000031.htm

I checked these links and found to be very preliminary.
U should check the National Semiconductor's Opamp Circuits Application
note. If Ur input frequency is fixed then use Bandpass filter -Besel or Chebishev type tuned to that frequncy as centre of bandpass.With LM324
U can do upto 2-300Hz but with TLO64 or better U can go to 10Khz. With
the quad opamp U can make 2stage filter with very low distortion.U may
need additional gain stage for final output.

[Acetronics2]

Hi,All

May be a look ( or search ) with the keyword DDS could lead s/o to fair solutions : simple ones with a piece of "old S Logic" and more sophisticated one with programmable specialised chips.

see also AD 9835 and its little brothers ...

Alain