4 order filter with a single IC project PCB

Posted on Feb 7, 2014

Circuit Filters with high orders are designed usually with 2 or more cascaded sections. This order 4 filter need only one OA IC, so we can achieve lower distorsions, lower intermodulation Resistors values represent the load on the OA output, the maximum TL081 load is 2k ©. R1-R4 build a 2. 5k © impedance and so the external load cannot be low

4 order filter with a single IC project PCB
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er than 10k ©. The filter characteristic is a Bessel polinome. With the actual components value, at -3dB the frequency is 1kHz. You can obtain different frequencies by changing the components value.

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