Selectable bandwidth notch filter
#notch filter
#selectable bandwidth
#op-amp
#filter circuit
#signal processing
#frequency response
#active filter
#bandwidth control
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Signal Meter circuit
The operational amplifier (op-amp) used in the signal meter circuit is the TL061. The LF351 can also be used interchangeably, as it has the same pin layout. For those using a TL062 or similar models, the differing pin configurations are...
Robots Bandpass Filter Calculator
These are operational amplifier (op-amp) based filters that are particularly effective within the audio frequency range. The calculators for these filters utilize formulas and tables from the book "Electronic Filter Design Handbook" by Arthur B. Williams. Bandpass filters allow a...
Notch filter uses an operational amplifier
This notch filter is beneficial for tunable band-reject applications in the audio range. The specified values will provide a tuning range of approximately 300 to 1500 Hz.
The notch filter is designed to attenuate a specific frequency while allowing others to...
op amp Twin T circuit noisy
The circuit is constructed on a breadboard and produces the expected sound characteristics, specifically a damped sine wave reminiscent of large 808/909-style kicks. However, it exhibits a significant amount of noise. An attempt was made to mitigate this by adding...
Active Filter Design with OpAmps
This application note aims to introduce filter designers to the basics of active filter design using monolithic integrated circuit operational amplifiers (op-amps). It includes a table of transfer functions and network equations for high-pass, low-pass, band-pass, and band-reject filters. Several...
Relaxation Oscillator
This circuit is an oscillator that generates a square wave. The operational amplifier (op-amp) begins with its two inputs in an undefined state, starting with the non-inverting input slightly higher than the inverting input. The op-amp significantly amplifies this difference,...
Dc-gain-controlled-video-amplifier
This amplifier utilizes a cascaded operational amplifier (op amp) integrator and a transistor buffer, Q1, to drive the gain control element. With a minor modification, the HA-5190/5195 stage is configured as a conventional non-inverting op amp and includes input and...
HQ Notch Filter Without Close-Tolerance components
A notch filter designed for a narrow frequency band of a few percent or less typically requires close-tolerance components. This assumption was challenged upon discovering a specialized operational amplifier integrated circuit (IC) from Maxim. In filters with steep slopes, component...
Automatic mooring light
The integrated circuit U1, which can be an LF351 or a 741 operational amplifier, functions as a comparator to regulate lighting. Resistors R2 and R3 establish a reference voltage of approximately 2.5 volts at pin 3 of U1. When light...