Alternative Parts Table and Assembly Procedure
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Parts Table

If you have a populated printed circuit board, then the following additional items will be required to construct the theremin:

ITEM DESCRIPTION VALUE MANUFACTURER MANUFACTURER PART
NUMBER
SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
A1
(SEE NOTE 1)
ANTENNA SEE DRAWING HARRISON
INSTRUMENTS
99999-5977-004 HARRISON
INSTRUMENTS
99999-5977-004 1
B1 BATTERY 9 VOLT,
NEDA 1604
EVEREADY 522 MOUSER 525-522 1
J1 BANANA JACK,
ANTENNA
INSULATED,
NYLON,
WHITE,
5/16"-32
UNEF-2A THREAD
JOHNSON
COMPONENTS
108-0901-001 MOUSER 530-108-0901-1 1
J2 JACK,
OUTPUT
MONO, 1/8" SWITCHCRAFT 42A MOUSER 502-42A 1
P1 BANANA PLUG,
ANTENNA
UNINSULATED,
6-32 INTERNAL
THREAD,
0.175" ACROSS
FLATS
JOHNSON
COMPONENTS
108-0753-001 MOUSER 530-108-0753-1 1
RV1 POTENTIOMETER 1K OHM
+/-20%,
LINEAR TAPER,
CONDUCTIVE
PLASTIC,
1/8" SHAFT
VISHAY/
SPECTROL
148-71102 MOUSER 594-148-7102 1
S1 SWITCH SPDT ITT
INDUSTRIES/
C & K
7101SYZQE MOUSER 611-7101-001 1
. KNOB, POTENTIOMETER 0.740"D,
0.437"H,
FOR 0.125"D
SHAFT
TYCO/
AUGAT
PKES-60B-1/8 MOUSER 506-PKES60B1/8 1
. STANDOFF,
CIRCUIT BOARD
SUPPORT
4-40 THREAD,
1.5" LONG,
HEXAGONAL,
ALUMINUM
KEYSTONE 2206 MOUSER 534-2206 4
. CONNECTOR,
9 VOLT BATTERY
. KEYSTONE 2241 MOUSER 534-2241 1
. MOUNTING CLIP,
9 VOLT BATTERY
. KEYSTONE 71 MOUSER 534-71 1
. MACHINE
SCREW,
BATTERY CLIP
MOUNTING
PAN HEAD,
PHILLIPS,
2-56 X 3/16"
STAINLESS STEEL
. . MCMASTER-
CARR
91772A105 2
. FLAT WASHER,
BATTERY CLIP
MOUNTING
#2,
0.25" O.D.,
STAINLESS STEEL
. . MCMASTER-
CARR
98019A300 2
. LOCK WASHER,
BATTERY CLIP
MOUNTING
#2 SPLIT-RING,
0.172" O.D.,
STAINLESS STEEL
. . MCMASTER-
CARR
92146A520 2
. NUT,
BATTERY CLIP
MOUNTING
2-56 X 0.188,
STAINLESS STEEL
. . MCMASTER-
CARR
91841A003 2
SEE NOTE 2 WIRE, HOOK-UP 22 GAUGE,
STRANDED,
TEFLON
INSULATED,
WHITE
ALPHA 5855-100-01
(ROLL OF 100')
MOUSER 602-5855-100-01
(ROLL OF 100')
1
. MACHINE
SCREW,
CIRCUIT BOARD
MOUNTING
PAN HEAD,
PHILLIPS,
4-40 X 3/8",
STAINLESS STEEL
. . MCMASTER-
CARR
91772A108 8
. FLAT WASHER,
CIRCUIT BOARD
MOUNTING
#4,
0.25" O.D.,
STAINLESS STEEL
. . MCMASTER-
CARR
98019A309 8
. LOCK WASHER,
CIRCUIT BOARD
MOUNTING
#4 SPLIT-RING,
0.12" O.D.,
STAINLESS STEEL
. . MCMASTER-
CARR
92146A530 8
. ENCLOSURE 2 PIECE,
5.25" WIDE X
3" HIGH X
2.125" DEEP,
ALUMINUM
BUD CU-3006-A MOUSER 563-CU-3006A 1
. THREADED ROD,
ANTENNA
SUPPORT
6-32 THREAD,
2' LONG
STAINLESS STEEL
. . MCMASTER-
CARR
98804A007 1
. NUT,
ANTENNA SUPPORT
6-32 X 5/16"
STAINLESS STEEL
. . MCMASTER-
CARR
91841A007 2
. FLAT WASHER,
ANTENNA SUPPORT
#6,
0.312" O.D.,
STAINLESS STEEL
. . MCMASTER-
CARR
98019A314 1
. LOCK WASHER,
ANTENNA SUPPORT
#6 SPLIT-RING,
0.25" O.D.
,
STAINLESS STEEL
. . MCMASTER-
CARR
92146A540 1

Notes:

  1. Harrison Instruments part number 99999-5977-004 is a 6"-square plate antenna. Also available is part number 99999-5977-003, which includes the plate, threaded rod, and banana plug and jack.

  2. Approximately 4' of hook-up wire required.


Assembly Procedure

  1. Drill eleven holes in the top part of the enclosure as indicated in the Enclosure drawing. Remove metal burrs from the holes using a center reamer. Using steel wool, remove sharp edges from both pieces of the enclosure. CAUTION:  Keep the steel wool away from electronic components, and thoroughly remove any remnants from the workpiece promptly.

  2. Cut the RV1 potentiometer shaft to a length of 3/8 inches.

  3. Solder two 4" lengths of hook-up wire to the potentiometer, RV1, as shown in the Wire Locations drawing. Note that one of the wires connects to both the slider terminal and the counterclockwise terminal of the potentiometer. Mark the free ends of the wires with tape: Mark the wire connected to the slider/counterclockwise terminals "1," and the wire connecting to the clockwise terminal "2." Twist the two wires together for a length of 1.25 inches, being careful not to break the soldered connections.

  4. Solder two 4" lengths of wire to the output jack, J2, as shown in the Wire Locations drawing. Identify each wire with tape: Mark the wire connected to the tip terminal of the jack "3" and the wire connecting to the sleeve terminal "4." Verify that the tip and sleeve terminals are correctly identified with a continuity tester or ohm meter. The sleeve terminal should have continuity (0 ohms) to the jack's threaded bushing. Twist the two wires together for a length of 2.5 inches, being careful not to break the soldered connections.

  5. Solder two 4" lengths of wire to the switch, S1, as shown in the Wire Locations drawing. Identify each wire with tape: Mark the wire connected to the center terminal of the switch "5" and the wire connecting to the end terminal "6." Twist the two wires together for a length of 1 inch, being careful not to break the soldered connections.

  6. Twist the battery connector wires together for a length of 1.5 inches. The black wire corresponds to the negative terminal, and the red wire corresponds to the positive terminal.

  7. Solder a 3" length of hook-up wire to the antenna jack, J1.

  8. Install the output jack, potentiometer, switch, antenna jack, and battery holder in the enclosure as shown in the Assembly drawing, details "A" through "E." Orient the switch, S1, so that the unused end terminal is located toward the middle of the enclosure. Note that the washers and nuts for the output jack, potentiometer, switch, and antenna jack are supplied with these items.

  9. Refer to the Assembly drawing, detail "F." Install the four 4-40 x 1 1/2"-long threaded standoffs on the printed wiring side of the board. Install the circuit board in the enclosure. Orient the board so that solder pads 1 through 8 are adjacent to the potentiometer and switch.

  10. Insert the wires from the potentiometer, output jack, switch, battery connector, and antenna jack through their respective strain-relief holes in the printed circuit board. The wires enter the strain-relief holes from the side of the board with no components.

  11. Trim the wires so they they extend about 1/2" past the holes. Strip 1/16" of insulation from each wire, and solder them to their respective pads, marked 1 through 9, in the Wire Locations drawing. Be sure that the battery connector's red wire goes to pad 7, and that its black wire goes to pad 8. The wire connecting the antenna jack, J1, to terminal 9 should be kept short, with only a slight amount of slack. The wires connected to the output jack, J2, should be routed away from the circuit board.

  12. Attach the knob to the potentiometer so that the knob's index line corresponds to the potentiometer's shaft position; the line should point to the 12 o'clock position when the potentiometer is centered.

  13. Fabricate the antenna plate as shown in the Antenna Plate drawing. Assemble the antenna as shown in the Antenna Assembly drawing. The banana plug, P1, is furnished with a screw and solder lug, which may be discarded. The threaded rod is furnished as a 2-foot length. Cut a 6" length of the rod for the assembly.

  14. Install a 9-volt battery, B1, in the holder and attach the battery connector. Refer to the Calibration Procedure to adjust the theremin.

Text, drawings, and photographs 2001, 2012, 2014 by Arthur Harrison