Re: How can I subtract one frequency from another ???

Hi,
What is cross posting? I'm kinda new to newsgroups, I"m assuming you mean
posting in another group as well as this one?
Sorry ;(

A bit more info on the application, the input will be either sound such as
music, (well within the human hearing range) or pure tones (sine waves).
I will be squaring up the output with an LM339 comparitor to drive a logic
level input IGBT.
If the 565 needs a square in, I could figure something out, but would rather
have the input to the comparitor reasonably "preserved".

Thanks again, and sorry if I've ruffled any feathers.

;)


"Andrew Holme" <andrew@xxxxxxxxxx> wrote in message
news:dps66c$qph$1$8300dec7@xxxxxxxxxxxxxxxxxxx
> Frank wrote:
> > So, the next question is (now that I know what "kind" of device to
> > use) what is the best mixer for this application.
> >
> > Is this a one IC solution, or do I have to design a circuit to my
> > specification?
> > Can I use the internal mixer of a max038, an XR2206, or even a 565
> > PLL?
> >
> > What do you suggest for a simple low cost readily avalible mixer?
> > Can they be designed with op amps?
>
> Looking at the MAX038 data***, I don't see a mixer in there. The XR2206
> has an amplitude modulation facility, so you could probably use that. The
> NE565 contains a Gilbert Cell switching mixer, and pin 5 must be driven
with
> a square wave. You didn't say if your signals were sine or square. Two
> square waves can simply be mixed using an XOR gate. For sine waves, you
can
> use a four-quadrant multiplier. I see someone in s.e.d mentioned the
AD633.
> I can second that recommendation. BTW you shouldn't use cross-posting.
> It's better to multi-post, then everybody gets to see everybody else's
> responses.
>
>


.

Loading