===== Optical Theremin =====
{{tag>project hardware electronics hadez}}
[[http://www.shackspace.de/gallery/index.php/Projekte/Theremin/67445286|{{http://www.shackspace.de/gallery/var/thumbs/Projekte/Theremin/67445286.jpg}}]]
[[http://www.shackspace.de/gallery/index.php/Projekte/Theremin/67479033|{{http://www.shackspace.de/gallery/var/thumbs/Projekte/Theremin/67479033.jpg}}]]
[[http://www.shackspace.de/gallery/index.php/Projekte/Theremin/otboard|{{http://www.shackspace.de/gallery/var/thumbs/Projekte/Theremin/otboard.png}}]]

This is a little (often annoying) piece of hardware.
The original design was posted on [[http://www.popsci.com/diy/article/2008-04/build-pocket-theremin-cheap|PopSci.com]] back in 2008.

I've refined the schematic and made a board layout in Eagle which you can download below.

  * Connect a 9V battery block via the EXTPWR pin header.
  * Connect a 8 Ohm speaker via the EXTSPKR pin header.
  * By bridging pins 1 and 2 of the AON jumper you can over-ride the switch and have the device 'always on'.
  * I didn't invest too much time into finding a suitable push button, so feel free to modify the design with a button of your choosing.

===== Downloads =====
  * [[http://www.shackspace.de/gallery/index.php/Projekte/Theremin/otschematic|Schematic]]
  * [[http://www.shackspace.de/gallery/index.php/Projekte/Theremin/otboard|Layout]]
  * [[http://voobar.follvalsch.de/files/opticaltheremin_rev2_20100830.tar.bz2|Eagle files (rev2 20100830)]]

===== Important Notes =====
All files released under Creative Commons non-commercial, by attribution, share-alike.

The rev2_20100830 board is not tested.
The only live and working setup is a perf-board based system.