You can generate a sine wave using PWM and a technique called direct digital
synthesis.

What frequency do you need?

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: "Freddie Leaf" <freddie_leaf@YAHOO.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, May 17, 2001 4:47 PM
Subject: [EE]: Square Wave Pulse Converted to Sine Wave Pulse


> Hi PICList,
>
> I need to generate a sine wave signal for input to an existing electronic
> circuit.  The signal will vary in frequency as a function of some other
inputs
> to a 16F877.  I'm thinking I could generate a 0V to 5V output pulse with
the
> PIC but need a circuit to convert this signal to a +/- sine wave. The
> peak-to-peak voltage has to be a least 2.0V.
>
> I've experimented with a cap in series with the PIC output, and a resistor
to
> ground.  This generates a nice positive and negative spike with clean zero
> crossings but this is not good enough.  The device I am sending the signal
to
> is also looking at the slew rate of the signal.  I need a relatively
genuine
> sine wave.
>
> Thanks in advance if you have an ideas.
>
> Freddie.
>
>
> =====
> Best Regards,
> "If it can't be done with a PIC, it can't be done :+)"
>
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