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LM2904VD Arkusz danych(PDF) 9 Page - ON Semiconductor |
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LM2904VD Arkusz danych(HTML) 9 Page - ON Semiconductor |
9 / 14 page LM258, LM358, LM358A, LM2904, LM2904A, LM2904V, NCV2904 http://onsemi.com 9 2 1 Vref =VCC 1 2 Figure 15. Function Generator Figure 16. Multiple Feedback Bandpass Filter For less than 10% error from operational amplifier. If source impedance varies, filter may be preceded with voltage follower buffer to stabilize filter parameters. Where fo and BW are expressed in Hz. Qo fo BW < 0.1 Given: fo = center frequency A(fo) = gain at center frequency Choose value fo, C Then: R3 = Q p fo C R3 R1 = 2 A(fo) R1 R3 4Q2 R1 −R3 R2 = + − + − − + Vref =VCC Vref f = R1 + RC 4 CRf R1 R3 = R2 R1 R2 + R1 R2 300 k 75 k R3 R1 C Triangle Wave Output Square Wave Output VCC R3 R1 R2 Vref Vin C C VO CO CO = 10 C Rf if, 1/2 LM358 Vref 1/2 LM358 1/2 LM358 100 k |
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