Wideband Two Pole High Pass Filter Schematic

The circuit provides a 10MHz cutoff frequency. Resistor R3 ensures that the input capacitance of the amplifier does not interact with the filter response at the frequency of interest. An equivalent low pass filter is similarly obtained by capacitance and resistance transformation.

Wideband Two-Pole High-Pass Filter Schematic

Read More..

Twin T RC Notch Filter

The two T-notch filter can be used to block unwanted frequencies or if placed in an op amp as a bandpass filter. the notch frequency occurs where the capacitive reactance equals the resistance (Xc = R) and if the values are close, the attenuation can be very high and the notch frequency virtually eliminated,Insertion of the filter depends on the load, the output is connected to the subject so that the resistors must be of much lower value than the load for minimal loss.

Twin-T RC Notch Filter Circuit diagram

For audio frequencies, the filter may act as a bass and treble boost circuit by attenuating the midrange. With 1.5K resistors and capacitors 0.1 uF, the band is in stop-10dB 500 Hz to 2 kHz. The depth and breadth of the reaction can be slightly adjusted to a value of 0.5 R and adding some resistance at the C-values,If the circuit is an operational amplifier is used as a bandpass filter, the response should be reduced to avoid oscillation.

Read More..

Razor sharp CW filter Circuit Diagram

The Razor-sharp CW filter Circuit Diagram consists of four stages of active bandpass filtering provided by two type-µ integrated-circuit dual op amps and includes a simple threshold detector (diodes Dl and D2) between stages 2 and 3 to reduce low-level background noise. Each of the four filter stages acts as a narrow bandpass filter with an audio bandpass centered at 750 Hz. The actual measured 3-dB bandwidth is only 80 Hz wide.

 Razor-sharp CW filter Circuit Diagram

Read More..

Variable High Pass Filter Circuit Diagram

This Variable High-Pass Filter Circuit Diagram second order filter which should prove useful in audio applications uses an LM1458 or other similar of op amp. It is tuneable from 30 to 300 Hz cutoff. R2a, b are ganged log-taper potentiometers. 

Variable High-Pass Filter Circuit Diagram

Read More..

Simple Wide band 2 pole high pass filter

The Simple Wide band 2 pole high-pass filter circuit provides a 10MHz cutoff frequency. Resistor R3 ensures that the input capacitance of the amplifier does not interact with the filter response at the frequency of interest. An equivalent low pass filter is similarly obtained by capacitance and resistance transformation . 

Simple Wide band 2 pole high-pass filter Circuit Diagram

Read More..

Wideband Two Pole High Pass Filter Schematic

The circuit provides a 10MHz cutoff frequency. Resistor R3 ensures that the input capacitance of the amplifier does not interact with the filter response at the frequency of interest. An equivalent low pass filter is similarly obtained by capacitance and resistance transformation.

Wideband Two-Pole High-Pass Filter Schematic

Read More..