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Single Op-Amp Twin-T Band-Pass and Notch Filter (1N4006)

2015-01-17 19:07  
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This article describes the Single Op-Amp Twin-T Band-Pass and Notch Filter (1N4006). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:1N4006.

This is a Single Op-Amp Twin-T Band-Pass and Notch Filter circuit. This circuit uses the twin-T topology which requires one or two op amps and three resistors and three capacitors. That’s mean this topology based on a passive (RC) topology. It is not difficult to match the six passive components, but it is critical. we can use single value of capacitance and a single value of resistance to create C3 and R3.? Here is the schematic diagram of the circuit:

 

Single Op Amp Twin T Band Pass and Notch Filter circuit schematic diagram

The component values are determined by following equation:
Bandpass configuration:
C1 = C2 = C
R1 = R2 = R
R3 = R/2
C3 = 2C
Fo=1/(2pRC)
R4 and R5 are used to control gain with R4>100*R5
Notch configuration:
R1 = R2 = R
C1 = C2 = C
R3 = R/2
C3 = 2C
Fo = 1/(2pRC)
R4=R5:HIGH

If the components are matched too closely, the bandpass circuit will oscillate. Selecting the resistor to virtual ground to be one E-96 1% resistor value off will de-tune the bandpass circuit slightly.

 


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