Speaker Volume

Archiver

I have a question for the group.
I'd like to have my Stamp produce tones --
which I know how to do, thank you,
but I want it to do it with programmable
volume, so it can get LOUD if I want
it to.

Ideally, it would also have a microphone
so it could listen to itself, me (via a
whistle), and other Stamps.

What is the best approach? The Piezo
approach seems limited in controllable
volume -- maybe I'm missing something?

The Speaker approach seems to take a lot
of power, which isn't a problem if needed.

I don't have a problem using transistors,
op-amps, whatever to control the volume,
I'm just looking for a start. And oh,
yes, it should be small (3" square max) [noparse];)[/noparse]

Archiver

We make making noise easy with the Audio Amp AppMod:

<A
HREF="http://www.parallax.com/detail.asp?product_id=29143">http://www.parallax.c\
om/detail.asp?product_id=29143</A>

-- Jon Williams
-- Parallax


In a message dated 3/15/2003 10:38:29 AM Central Standard Time,
allan.lane@h... writes:

> I have a question for the group.
> I'd like to have my Stamp produce tones --
> which I know how to do, thank you,
> but I want it to do it with programmable
> volume, so it can get LOUD if I want
> it to.
>
> Ideally, it would also have a microphone
> so it could listen to itself, me (via a
> whistle), and other Stamps.
>
> What is the best approach? The Piezo
> approach seems limited in controllable
> volume -- maybe I'm missing something?
>
> The Speaker approach seems to take a lot
> of power, which isn't a problem if needed.
>
> I don't have a problem using transistors,
> op-amps, whatever to control the volume,
> I'm just looking for a start. And oh,
> yes, it should be small (3" square max) [noparse];)[/noparse]



[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Well, you can use a standard audio amplifer and replace the
potentiometer used for volume control with a digital potentiometer.
Maxim has some good ones. And, you can request free samples from
them on their web site.

-Dustin

--- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
wrote:
> I have a question for the group.
> I'd like to have my Stamp produce tones --
> which I know how to do, thank you,
> but I want it to do it with programmable
> volume, so it can get LOUD if I want
> it to.
>
> Ideally, it would also have a microphone
> so it could listen to itself, me (via a
> whistle), and other Stamps.
>
> What is the best approach? The Piezo
> approach seems limited in controllable
> volume -- maybe I'm missing something?
>
> The Speaker approach seems to take a lot
> of power, which isn't a problem if needed.
>
> I don't have a problem using transistors,
> op-amps, whatever to control the volume,
> I'm just looking for a start. And oh,
> yes, it should be small (3" square max) [noparse];)[/noparse]