Updated 02.10.07
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RS
Theremin - Ultimate 2b
100%
Radio Shack
This Ultimate 2b is a "true heterodyne theremin voice"
as Lev
Sergeyevich Termen discovered in his laboratory.
1. Use my favorite passive volume control
using a simple
CdS
Photo-Cell
found in a
bathroom nightlight. This works better than a hoop
antenna, simple and effective.
2. Use a dual-voice volume control
using two modulated LED's
beams projected onto
a handheld solar cell Volume
Control . Sound samples at bottom
of current page.
Real Analog Angelic
.mp3 (130k)
is simple
acoustics, Lev would not
use a synth!
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Start this project
by only spending $25
usd. Etch the circuit board and build the few components in the Green
boxes of the graphic below. You will be tuning
your theremin sound through a AM Radio for quick success.
Add the rest of the components later but soon because the copper traces
oxidize!
"My
theremin project is a gift to you if you are capable of thinking outside
the box, while reaching forward to touch the past." Christopher
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Visit the
RS
Showcase Photos
of other constructed Ultimate 2b Theremins
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Antenna Connection
Use a 30" wire antenna connected to the upper left side
graphic below circled Antenna
connection or use
the Lev Antenna which connects to the left side L1-L3 pad
which is the L1 coil center tap connection.
The antenna length begins at the solder spot on the circuit board
connection!
Use
Lev's Antenna for Total Theremin Note Control
C4 & L3 are not seen on
the graphic below, they are part of Lev's Antenna schematic.
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Warning: If you reverse the battery connection you
will damage the TL082 chip! (-;
The printed outline size of the PC Board
should be 6" x 2.9"
(15 cm x 7.2 cm)
PDF info to make this
board is at the bottom of this webpage
The S--- on the left side of the board near L1 is where the foil can be cut
to add a switch.
Find out about R-Tune here U2b
Schematic |
| Update
Notes: |
C2 & C8 - measure two 100 pf for identical values or
close, used for LC oscillators.
The C5,
C11,
C13, C14 capacitors .1
uf RS Catalog # has change to 272-1069
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| Ultimate
2b Sound Samples
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*
Two LED
Voice Real-Time Play with the hand held solar cell for volume
control *
Ultimate2.mp3 (282k)
or Ultimate2_3.mp3
(272k)
This demonstrates two voice LED pitch
manipulation Optical
Volume
Control
The fluty sound is the pure sine wave
while the square wave timbre mix creates the whinny sound.
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With
vibrato and using no volume control
With a little practice I might get rid of the flat
notes!
Over the Rainbow (220k) 06.12.05 |
Who said transistors can't sound better tubes/valves?
Using acoustic enhancements
tube-or-tran.mp3
(194k) 07.14.05 |
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Etching
your own "Ultimate 2b- PC Board"
This
may seem scary but it's really not difficult!
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The PDF
pc-board printout is available
here.
Email Christopher: Unfortunately I am unable to
answer email at this time.
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| "This
website will go away completely December
31, 2008" |
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