Chris "=A0 Chris =A0=A0=A0=A0 I found the abstract and filter diagram on John Lahr's web=0As= ite. 1) I am not sure how the=A0 max gain is chosen. Is it based on the=0Ad= ifference between the actual sensor low frequency corner and the=0Adesired = low frequency corner given a 40 db /decade dropoff?=A0 2) I=0Aassume the tw= o single pole circuits identical 3)=A0 Do the other values=0Ain the example= circuit remain the same except as you have commented on?=0A4) If I want a = lower corner frequency of 0.03 hz is the "lower turnover=0Afrequency (1/2 P= i C1 R2)" =3D 0.015 hz? It is probably obvious I don't=0Ahave the full repo= rt." I realize that R3,R7 & R11 are offset resistors. How does one determine the= value of R5 and R8 or does it matter? Regards Barry
Chris " = ; Chris &nb= sp; I found the abstract and filter diagram on John Lahr's web=0Asite= .. 1) I am not sure how the max gain is chosen. Is it based on the=0Ad= ifference between the actual sensor low frequency corner and the=0Adesired = low frequency corner given a 40 db /decade dropoff? 2) I=0Aassume the= two single pole circuits identical 3) Do the other values=0Ain the e= xample circuit remain the same except as you have commented on?=0A4) If I w= ant a lower corner frequency of 0.03 hz is the "lower turnover=0Afrequency = (1/2 Pi C1 R2)" =3D 0.015 hz? It is probably obvious I don't=0Ahave the ful= l report." I realize that = R3,R7 & R11 are offset resistors. How does one determine the value of R= 5 and R8 or does it matter? Regards Barry |