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Active band-reject filter – Circuit Schematic
Active band-reject filter
A filter with a band-reject characteristic is frequently referred to as a notch filter. A typical circuit using a µ 741 is the unity-gain configuration for t...
Notch filter uses an operational amplifier – Circuit Schematic
Notch filter uses an operational amplifier
This notch filter is useful for tunable band-reject applications in the audio range. ...
Adjustable notch filter – Circuit Schematic
Adjustable notch filter
In applications where the rejected signal might deviate slightly from the null on the notch network, it is advantageous to lower the Q of the network. This insu...
Analog multiplier – Circuit Schematic
Analog multiplier
The F — V input frequency is locked to the V — F output because the LTClG43's clock is common to both sections. The F — V's reference is us...
Improved non-inverting integrator – Circuit Schematic
Improved non-inverting integrator
In the circuit in Fig. 1, ICla produces the integral term required but also has the side effect of producing a proportional term not required, so this term is s...
Instrumentation meter driver – Circuit Schematic
Instrumentation meter driver
Three op amps Ul, U2, and U3 are connected in the basic instrumentation amplifier configuration. Operating from ± 5 V, pin 8 of each op amp is connected dire...
Current-collector head-amplifier – Circuit Schematic
Current-collector head-amplifier
To amplify small current signals such as from ah electron-collector inside a vacuum chamber, it is convenient for reasons of noise and bandwidth to have a "head...
Instrument preamp – Circuit Schematic
Instrument preamp
The input impedance is the value of potentiometer Rl. If your instrument has extra-deep bass, change capacitor Cl to 0.5 mF. What appears to be an extra part in...
Quad op amp generates 4 waveforms – Circuit Schematic
Quad op amp generates 4 waveforms
A quad op amp can simultaneously generate four synchronized waveforms. The two comparators (Al and A3) produce square and pulse waves, while the tWo integrators...
Precision frequency-to-voltage converter – Circuit Schematic
Precision frequency-to-voltage converter
In the precision circuit, an operational amplifier provides a buffered output and also acts as a 2-pole filter. The ripple will beless than 5 mV peak for all fr...
Multiple-feedback bandpass filter – Circuit Schematic
Multiple-feedback bandpass filter
The op amp is connected in the inverting mode. Resistor R3 from the output to the inverting input sets the gain and current through the frequency-determining ca...
Bandpass and notch filter – Circuit Schematic
Bandpass and notch filter
The Quad op amp MC4301 is used to configure a filter that will notch out a given frequency and produce that notched-out frequency at the BP terminal, useful in ...
Active bandpass filter – Circuit Schematic
Active bandpass filter
The circuit is a two-pole active filter using a TL081 op amp. This type of circuit is usable only for Qs less than 10. ...
Bandpass filter – Circuit Schematic
Bandpass filter
The input signal is applied through R3 to the inverting input of the summing amplifier and the output is taken from the first integrator. The summing amplifier ...
Active bandpass filter – Circuit Schematic
Active bandpass filter
This filter has a bandpass centered around 1kHz, for applications such as bridge amplifiers, null detectors, etc. ...
Programmable bandpass using twin-t bridge – Circuit Schematic
Programmable bandpass using twin-t bridge
The circuit gives a programmable bandpass where both the cut-over frequency and the gain, A, are controlled independently. In the twin-T bridge the resistors R ...
Low-pass filter – Circuit Schematic
Low-pass filter
This circuit is useful where fast signal acquisition and high precision are required, as in electronic scales. The filter's time constant is set by the 2 ohm r...
Multiple feedback low pass filter – Circuit Schematic
Multiple feedback low pass filter
The low bias currents permit high resistance and low capacitance values to be used to achieve low frequency cutoff. fc = 10 Hz, AVCL = 4, Passband ripple = 0.1 ...
Razor-sharp CW filter – Circuit Schematic
Razor-sharp CW filter
The circuit consists of four stages of active bandpass filtering provided by two type-µ integrated-circuit dual op amps and includes a simple threshold detec...
Digitally tuned low power active filter – Circuit Schematic
Digitally tuned low power active filter
This constant gain, constant Q, variable frequency filter provides simultaneous low-pass, bandpass, and high-pass outputs with the component values shown, the c...