[Re: vc wave select]3900 found too

[INDRID COLD]

ok i am starting to get worried here. everytime i come up with an interesting
idea for a project it shows up somewhere else a few weeks later. about six
weeks ago i was checking out Haible's wave scanner and i thought to myself,
gee i could do something similar using a bar display chip and it wouldn't be
terribly complex. now that idea has turned up here. this has happened so many
times in the past year that i am starting to wonder if i have little spies in
my head. very weird. then again maybe this is a good thing. i'll think up
stuff and leave the fleshing out to others and save myself some effort.:)
also for anybody looking for LM3900s i found some in the TechAmerica catalog
$1.27 a pop. you can search for them on the web or pick up the catalog at the
nearest Radio Shack. thats enough ranting for now. see ya.
indridcold at usa.net
http://www.indridcold.conk.com


"tomg" <vco at mindspring.com> wrote:

> hey, doing a adc with the NS bar graph drivers is a nice idea !
> I think they can do a dot and a bar mode.
> Does your design take advantage of this dual mode?
> 
> m.c.

No, both 3915s are in dot mode. This gives me one line active at
a time, making it a lot easier to steer it to the output I want.

>You can save a lot of wiring using 4532 priority encoders.
>Grant Richter 

The wave selector is not a true adc. I rearranged it so it would
switch waves in the order I wanted. Ruins it for adc applications.
But your 4532 idea might work fine on this version. I though
somebody might be interested, so I converted it to a more
proper adc.

-tg



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