The following diagram is the Theremin music instrument effect. A guitar or instrument amplifier is an ideal companion unit for the theremin; either one allows bass or treble boost, as desired, and fuzz (distortion) or reverberation (if these features are incorporated in the amplifier”s circuit). Simply provide a suitable cable plug and connect the theremin”s output cable to the amplifier”s input jack.
Schematic Diagram:
Parts List:
| B1 C1,C6 C2,C7,C17,C22 C3,C8,C19 C4,C9 C5,C10 C11 C12,C14,C15 C13 C16 C18 C20,C21 D1 L1,L2,L3,L4 Q1,Q2,Q4 Q3,Q5 Q6,Q7 R1,R4,R17 R2,R5,R18 R3,R6,R7,R8,AND R11,R19 R9,R12,R16,R20 R10,R13 R14,R15 | 9-VOLT BATTERY 390pF POLYSTYRENE CAPACITOR 0.001uF POLYSTYRENE CAPACITOR 0.1uF DISC CERAMIC CAPACITOR 10uF, 15V ELECTOLYTIC CAPACITOR 60pF POLYSTYRENE CAPACITOR 200uF, 15V ELECTOLYTIC CAPACITOR 0.001uF DISC CERAMIC CAPACITOR 0.01uF DISC CERAMIC CAPACITOR 5uF, 15V ELECTOLYTIC CAPACITOR 0.01uF POLYSTYRENE CAPACITOR 4.7pF POLYSTYRENE CAPACITOR 1N34A DIODE 50-300uH ADJUSTABLE COIL MPS3638 TRANSISTOR (MOTOROLA) MPS3708 TRANSISTOR (MOTOROLA) TIS-59 N-CHANNEL FET (TEXAS INST) 47K 1/2W 10% RESISTOR 33K 1/2W 10% RESISTOR 1K 1/2W 10% RESISTOR 10K 1/2W 10% RESISTOR 100K 1/2W 10% RESISTOR 4.7MEG 1/2W 10% RESISTOR |
PCB Layout:
The theremin is ideal for amateur as well as professional musicians and can be used for “fun” sound effects as well as for serious music. It makes a wonderful addition to the home recreation room, and can be used equally well by rock”n” roll groups or larger bands. Theatrical groups find it just the thing for producing eerie and spine-tingling background effects to accompany mystery or horror plays, and for the budding scientist or engineer, it is an excellent Science Fair project.
Download Theremin music instrument explanation includes the theremin schematic and pcb layout:
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"C20/C21 4.7pF POLYSTYRENE CAPACITOR"
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