Voice shifter
original effects unit
Published in issue 287, April 2000
Effects units are and remain popular, especially with pop musicians. These units, phasers, clippers, flangers, and so on are used to make a specific sound or range of sounds. This article describes how such an effects unit may be built from simple means. It is another application of the pitch shifting technique as used in phasing, chorus and flanging, but, unlike true pitch shifting in which a constant interval is created above or below the input signal, it shifts a specific audio band.It has been said before, and will no doubt be said again many times: we live in a funny world. Most music lovers go out of their way and are prepared to spend a lot of money to achieve music reproduction with as little distortion as possible.There are, however, others (lovers of a different type of music) who go to great lengths to get away from high fidelity sound. These people feel that the sound processing must match their ideas of what music should be.
Resistors:
R1 = 150kΩ
R2 = 680Ω
R3 = 1kΩ5
R4 = 10kΩ
R5 = 220kΩ
R6 = 100kΩ
P1,P2 = 100kΩ linear potentiometer
Capacitors:
C1,C2,C16 = 100nF MKT (Siemens)
C3,C9,C10,C11,C17,C19 = 100nF ceramic
C4 = 270pF
C5 = 33pF
C6,C13 = 1nF ceramic
C7,C8 = 39pF
C12,C14 = 150pF
C15 = 15nF MKT (Siemens)
C18 = 10µF 63V radial
C20 = 100µF 16V radial
Semiconductors:
D1 = BB509 (ITT)*
D2 = 1N4002
IC1,IC2 = NE612N/SA612AN (Philips)*
IC3 = 7806
Miscellaneous:
X1,X4 = CSB455 (Murata)*
X2,X3 = SFD455A (Murata)*
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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