• on Test & Measurement
  • Published in issue 7/2013 on page 92
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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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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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