LM258, LM358, LM358A, LM2904, LM2904A, LM2904V, NCV2904

http://onsemi.com

9

2

1

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.

BW

< 0.1

Given:

Then:

R3 =

Q

R3

R1 =

R1 R3

R2 =

+

−

+

−

−

+

f =

R3 =

R2 R1

R2 + R1

R2

300 k

75 k

R3

R1

C

Triangle Wave

Output

Square

Wave

Output

R3

R1

R2

C

C

CO

CO = 10 C

if,

1/2

LM358

1/2

LM358

1/2

LM358

100 k