Hello.
   For a sinusoidal generator, could I use this at 1 MHz? I know that at
this frequency, the proto-board's stray capacitance (about 20 or 30 pF, on a
good day) could be a problem, so a test must be done on a  PCB board.
Perhaps choosing faster amp-ops could be sufficient to be able to use this
model to obtain sine waves (TL071, LF353...)
 Could you please send us the schematics?

 Thank You.

                                                              Paul H. Castro
----- Original Message -----
From: "Brian Clewer" <brianclewer@MISTRAL.CO.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, October 27, 2003 9:37 AM
Subject: Re: [EE]: Simple function generator circuit?


> You could have a sine and square wave oscillator with 4 opamps.  All you
> have to do is construct the first two as integrators, the third as an
> inverting amp and feed back the output into the input of the first
> integrator.  This gives you a sine wave.  Then use the last amp as a zero
> crossing to convert to a square wave.
>
> Will send you a diagram off list if you need further clarification.
>
> Brian.
>

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