LM258, LM358, LM358A, LM358E, LM2904, LM2904A, LM2904E, LM2904V, NCV2904 VCC C R3 R1 C V - in 1/2 VO LM358 + CO R2 CO = 10 C Vref 1 V ref = VCC 2 Given: fo = center frequency A(fo) = gain at center frequency Choose value fo, C Q 1 Then: R3 = V Triangle Wave ref = VCC R2 f 2 o C Output R3 300 k R1 = Vref + 2 A(fo) R3 1/2 + LM358 R1 R3 75 k 1/2 R2 = - LM358 4Q2 R1 -R3 R1 100 k Square - Wave Q For less than 10% error from operational amplifier. o fo < 0.1 Vref Output BW C Where fo and BW are expressed in Hz. Rf R1 + RC R2 R1 If source impedance varies, filter may be preceded with voltage f = if, R3 = 4 CR R2 + R1 follower buffer to stabilize filter parameters. f R1 Figure 15. Function GeneratorFigure 16. Multiple Feedback Bandpass Filterwww.onsemi.com9
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