Active Audio Filter Design
High-Pass
Low-Pass
Band-Pass
Type of filter you wish to design.
Required Voltage Gain
Bandwidth Hz (Band-Pass filter)
Frequency (KHz)
Value of C2 (nF)
Hi All, I've tried to make this Audio Filter Designer work with all versions of Netscape Navigator, Netscape Communicator and IE 4. I'm sorry but it won't work in IE3. Instructions: Select which type of filter you want to design and fill in the values in the other boxes above this window. You only need to enter a value for Bandwidth when you are designing a Band-Pass filter. In the box labelled 'Frequency', enter the required cut-off frequency for high and low pass filters, or the centre frequency for a band-pass filter. A good starting point for the value of the capacitor, C2, is between 10 and 20 nF. Use the 'Show Diagram' button to display a circuit diagram of the filter and use the 'Calc' button to display the component values for the filter you have chosen. Please note that the maths used in this filter designer were taken from an old magazine and I have no way of verifying their accuracy.
R1 =
R2 =
R3 =
C1 =
C2 =
C3 =
73 John. G4VWL @ GB7DEE