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The figure below shows the Wien Bridge Oscillator, which uses an op-amp and an RC bridge.
Wien Bridge Oscillator Basic Circuit with Operational Amplifier.
The RC bridge is scaled with the oscillator frequency, determined by R and C.
In the bridge, resistors R1 and R2, and capacitors C1 and C2 are the frequency adjustment elements, while resistors R3 and R4 are part of the feedback loop.
The output of the operational amplifier and the input of the bridge are connected at points a and c. The output of the bridge, at points b and d, is the input to the operational amplifier.
Neglecting the loading effects of the input and output impedances of the operational amplifier, we have the following expression for the bridge circuit:
F.1F.2
In particular, for R1 = R2 = R and C1 = C2 = C, the oscillator frequency will be:
F.2.1F.1.1
Therefore, a ratio of R3 to R4 greater than 2 will result in a loop gain sufficient for the circuit to oscillate at the calculated frequency to be set.
This publication presents the basic circuit that can be expanded with better operating characteristics. Development is the privilege of those who try to do better. Good job.
EDUARDO MARIGONDA
Education: Postgraduate in Industrial Automation and Graduate in Electrical and Electronic Engineering at the Faculty of Industrial Engineering (FEI). Has technical training in Electronics at E.T.E. Lauro Gomes.
Professional Experience: Management of Commercial Accounts, Development of Energy Systems Solutions and Technologies for Automation, analysis of the feasibility of offering costs, customer service in support and development of an effective solution to the need, manager in the supervision of ISO 9001 Quality, customer service regulations and inspections.
Development of electrical energy products (UPS, Rectifiers, Inverters, Transformers, Batteries and Special Sensors), coordination and planning of infrastructure and installations of electrical and electronic systems, implementation and projects of telecommunications energy systems, special lighting projects and maintenance in electrical, instrumentation and electromechanical equipment in refineries.
Some Projects:
• Itinerant Relief Operation E-house with Uninterrupted Power System for Platforms.
• Development of the Commercial Process Management System.
• Maritime Port Access and Railroad Control System.
• Implementation and Management of Quality Control ISO 9001/2015.
• Development of the UPS System Parallel Solution without the existence of a “single point of failure”.
Academic Professional Experience:
• Industrial Electronics Instructor – SENAI Roberto Simonsen.
• Professor of Electronics and Telecommunications Technician – Colégio and Faculdade Anchieta.
• Electronic Technician Coordinator – Colégio Anchieta.
• Professor of Optoelectronics, Power Electronics and AutoCAD Extracurricular Courses.
Contact:
• contato.eletronicaprofissional@gmail.com
• eduardo.marigonda@leistung.ind.br
• https://www.linkedin.com/in/eduardo-marigonda-7b300ab/
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