Few Extra Components Stabilize Oscillator:  02/15/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) The circuit beneath the dashed line in Figure 1 is the well-known Wien-bridge oscillator. The lamp is a common tungsten incandescent bulb. Its resistance forms a substantial part of the gain-setting network. For the oscillator to function properly, the increase in lamp resistance accruing from the ac signal must bring the open-loop gain to unity while the op amp is still in its linear range. At that point, RA=2(RB+RLAMP), and the output is a low-distortion sinusoid. It's difficult to achieve stable operation at high frequencies, because the output decays rapidly if the open-loop gain falls below unity. The lamp does not have enough time to respond, and "squegging" develops....

Programmable Oscillator uses digital potentiometers:  03/07/02 EDN Design Ideas  /  (added 1/05)  Digital potentiometers are versatile devices; you can use them in many filtering and waveform-generation applications. This Design Idea describes an oscillator in which setting the resistance of two digital potentiometers independently programs the oscillation amplitude and frequency. Figure 1 shows a typical diode-stabilized Wien-bridge oscillator that generates accurate sine waves fro... ...

Sine Wave Generator:  (Electronic Schematic / circuit added 4/02)

Single-Supply Wien Bridge Oscillator:  AB-111 - Analog Devices Application Notes  (Circuit / schematic design added 6/06) Wien Bridge Oscillators require only one op amp, important in battery-operation. This circuit operates from a single 9V battery.

The Wien bridge Oscillator is reborn:  06/13/02 EDN Design Ideas  /  (added 1/05)  In 1940, William Hewlett and David Packard launched a product from a garage. The product was a Wien-bridge oscillator. It consisted of a single-pole highpass filter in series with a single-pole lowpass filter. To keep the gain constant, the circuit used an incandescent pilot light to provide AGC (automatic gain control)....

Wien Bridge Oscillator:  (circuit / schematic added 2/03)

Wien Bridge Oscillator #2:  This circuit produces an extremely low distortion sine-wave, in spite of the non-linear devices used for amplitude limiting (D1 and D2). The reason is first that distortion (harmonics) are fed to the minus input of the opamp with far less loss than to the plus input, severely attenuating them. Second, a Wien bridge oscillator requires a gain of exactly 3.00. No more and no less. For lowest distortion, calculate the minimum and maximum available gain to just above and just below 3.00. In other words, use as little amplitude control as possible.  Designed by Andrew R. Morris  (added 09/05)

Wien Bridge Oscillator (Rail-to-Rail) Sine Wave Generator :  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

Wien Bridge Oscillator is Reborn:  06/13/02 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) In1940, William Hewlett and David Packard launched a product from a garage. product was a Wien-bridge oscillator. It consisted of a single-pole highpass filter in series with a single-pole lowpass filter.

Wien Bridge Oscillator keeps THD BeLow One PPM:  11/10/94 EDN-Design Ideas  / (added 01/04)  The Wien-bridge sine-wave oscillator uses a light bulb to stabilize its amplitude. The circuit doesn't have a light bulb; it sports several enhancements that lower its distortion and generate a test signal pure enough for testing modern op amps and high-resolution A/D converters....

Wien Bridge Oscillator-42003.0:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

Wien-bridge Theremin:  This circuit is a basic theremin with only a pitch control. It uses the "heterodyne" technique, as did Theremin's original instrument. Heterodyning is advantageous in its simplicity, and is made further attractive in this design by eliminating the coils that are usually hard to find. Although this is a simple theremin without optimized sensitivity and noise characteristics, it is a viable performance instrument.