Ik ben op zoek gegaan naar een bijbehorende tekst, kon de site niet meer vinden (bestaat niet meer) maar de tekst had ik nog in een tekstdocument staan. De bijbehorende tekst is als volgt:
The Coolidge has been host to several Theremin concerts in the past, and surely will host more in the future. Here is some technical info about how to build this musical instrument of the radio age.
Perhaps you've heard recordings of this eerie musical instrument, or maybe you've heard its wailing sound in science fiction movies. At any rate, you can construct your own Theremin without too much trouble. Enjoy some strange "outer space" music and experiment with the effect capacitance can have on an oscillator circuit's frequency.
Our Theremin is constructed in a 7-in. x 5-in. x 2-in. metal box with a punched board as the chassis.
Parts are standard: two whip antennas are connected to 5 way binding posts J1 and J2. Vari-loopsticks are used as antenna tuning coils. The leads should be as short as possible, the shield connections on the two 2N1264 transistors should be cut off, and care should be taken not to let the circuit wiring come in contact with the cabinet box. The loopsticks should be in the center of the chassis. J1 and J2 mount on opposite sides of the 7-in. length of the chassis.
When the unit is constructed, the two whip antennas are placed in the binding posts in a vertical position. The unit is then placed near the back of an AM broadcast radio. The loopstick slugs are set about halfway in. Now adjust the 200-pf capacitor at J1 until a hissing noise is heard over the radio, at about the center of the band. Next adjust the 200-pf capacitor at J2 until you hear a very loud whistle. The AM radio's dial setting should not be changed.
Go back to the 200-pf capacitor at J1 and readjust it for the lowest pitch. You are now ready for playing the instrument.
To play the Theremin just move your hands around in the air a few inches away from the antennas. It is not necessary to touch the antennas. With a little practice you might be able to play a recognizable melody.
Parts List
Symbol
Description
Radio Shack No
Q1 transistor, 2N1097
276-405
Q2,Q3 transistor, 2N1264
276-412
R1
resistor, 180,000 ohms 70-0195
R2,R3
resistors, 56,000 ohms 70-0195
C1,C2
capacitors, 220 pf 71-5111
C3, C4
capacitors, 200 pf, variable 71-4035
C5, C6
capacitors, 0.01 mfd.
71-5194
L1, L2
vari-loopstick
270-1430
J1, J2
5-way binding post
274-333
S1
switch, SPST
275-602
B1
9volt battery
23-464
antenna: miniature whip, 38" long
EDIT: Graag wil ik duidelijk maken dat het profielwerkstuk niet zozeer om het eindproduct zal draaien, maar meer om het bouwproces en de techniek erachter ( de oscillatoren, resistoren etc.) Het is een leuke bijkomstigheid als het toestel perfect werkt, maar onze prioriteit ligt toch bij het bouwen en er ook maar een enkele vorm van geluid uit te krijgen.
Dus niet precies Theremin, maar meer het idee van een Theremin, zolang er maar iets van geluid uit komt