LM324, LM324A, LM324E, LM224, LM2902, LM2902E, LM2902V, NCV2902

www.onsemi.com

9

2

1

For less than 10% error from operational amplifier,

If source impedance varies, filter may be preceded with

voltage follower buffer to stabilize filter parameters.

BW

< 0.1

Then:

R3 =

Q

R3

R1 =

R1 R3

R2 =

+

-

+

-

f =

R3 =

R2 R1

R2 + R1

R2

300 k

75 k

R3

R1

100 k

C

Triangle Wave

Output

Square

Wave

Output

if

1/4

LM324

1/4

LM324

Figure 16. Function Generator

Figure 17. Multiple Feedback Bandpass Filter

1

2

-

+

R3

R1

R2

C

C

CO = 10 C

1/4

LM324