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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
CMOS Theremin
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droffset



Joined: Feb 02, 2009
Posts: 489
Location: London and Oxford
Audio files: 2

PostPosted: Tue Jul 14, 2009 7:33 pm    Post subject: CMOS Theremin
Subject description: CMOS Theremin
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SURELY this must be in the Lunetta spirit? Laughing I'm so building one.
http://home.att.net/~theremin1/101/101.html
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hexagon5un



Joined: Apr 10, 2009
Posts: 16
Location: Washington DC

PostPosted: Thu Aug 20, 2009 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Even more in the CMOS/Lunetta style:

I made an more minimal version of Art's design with a 74HCU04 for the oscillators fed straight into a 74HC86 XOR for the "ring modulation".

Copy his two oscillators (U1A and U1B, U2A and U2B) onto a single chip. The U in 74HCU04 is important -- I had trouble with oscillators syncing with each other when I used 74HC04's. Then just run the outs of those two oscillators straight into the XOR chip.

And because I'm really minimal, for output I just put a 100uF cap on the XOR out, to a speaker, and to ground.

For an antenna, I just use an alligator clip and a foot-square piece of aluminum foil, because then the whole shebang fits in your pocket.

I run it on a rechargeable 3.6v cell phone battery most of the time and I find it helps the range a lot to couple myself to the circuit's ground wire because the battery is not earth-grounded. So I pulled out the ground line to a patch of aluminum foil that I can contact with my fingers. Since this radically changes the frequency of the variable oscillator, you can use it as a simple playable gate for the sound.

I've attached my notes. I'm actually running a small workshop building these tonight at my local hackerspace. (www.hacdc.org).


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droffset



Joined: Feb 02, 2009
Posts: 489
Location: London and Oxford
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PostPosted: Thu Aug 20, 2009 6:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great idea, would make a fun evening project, cheers!
_________________
==================
Check out the FREE Intro to Lunettas Document
https://docs.google.com/Doc?docid=0AZIwOP-PR9sSZDlidzgzbV8wY3RjenJqanY&hl=en

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hexagon5un



Joined: Apr 10, 2009
Posts: 16
Location: Washington DC

PostPosted: Sat Aug 22, 2009 2:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Made this sketch for the class. You'll also need power and ground lines, and possibly a decoupling cap (10u?) across them. I located mine physically between the chips.

Enjoy.


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