Hello, All

I have been having fun linking a hexcore to Wilf's BEAM sound
effects circuit--the two influence each other and make a most
interesting mix of sounds.

That got me interested in having sounds as output indicators, where
we customarily use LEDs. The result is posted at
http://groups.yahoo.com/group/beam/files/Greybeard's%20Stuff/

I'm not entirely happy with it, as it runs at 80 mA even when it's
quiet (the 6-Nv ladder [some people call this a 'spinal cord'?] uses
34 mA by itself) and it makes some pretty raspy square-wave type
beeps, but it DOES work. I am always happy when I design even more-
or-less works! 8^D Don't ask me *how* it works, I'm not there yet.
I did discover that the diodes (1N418 type) are needed to keep the
sound oscillator from resetting the process in the spinal cord. I
also found that I couldn't use the last Nv in the ladder to hook to
a sound or it sent the ladder into a frenzy, don't know why though.

You can tell where I'm headed--a noisy bot that chirps and chortles
and whistles and snorts as it goes about its life. What I need is
something of the cheerful whistles and warbles of Wilf's sound
effects that will turn on in response to a Nv output, and remain
quiet otherwise, without eating current. (I don't ask for much!)

Now's the time to point out that this was already done by somebody
back in 1999... all I need is the reference!

Thanks in advance for any help I get

Keep BEAMing and dreaming
Tom