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Wideband Wien Oscillator with Single-Gang Pot

Wideband Wien Oscillator with Single-Gang Pot
This Wien bridge oscillator (after Max Wien, 1866–1938) produces a low-distortion sine wave of constant amplitude, from about 15 Hz to 150 kHz. It requires just four opamps and will work off a single 9-volt battery. Also, unlike most Wien bridge oscillators, it does not require a dual-gang potentiometer for tuning.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Component list
R1,R2,R3,R6,R10,R11 = 10kOhm
R7 = 100kOhm
R4,R9,R12 = 100Ohm
R5 = 12kOhm
R8 = 1kOhm
P1,P2 = 10kOhm potentiometer, linear logarithmic law
R13 = LDR, R(dark) >100kOhm, e.g. Excelitas Tech type VT90N1 (Newark/Farnell # 2568243)
C1,C5 = 1µF solid
C2,C6 = 100nF
C3,C7 = 10nF
C4,C8 = 1nF
C9-C12 = 47µF 16V, electrolytic, radial
D1,D2,D3 = 1N4148
D4 = LED, red, 5mm
IC1,IC2 = TL072ACP
SW1 = 2-pole 4-position rotary switch, C&K Components type RTAP42S04WFLSS
K1,K1,K2 = PCB terminal block, 5mm pitch
PCB # 120330-1

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