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Tab Electronics Guide to Understanding Electricity ... - Sciences Club

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336 Chapter Twelve<br />

Figure 12-7<br />

A voltage-controlled<br />

bandpass filter.<br />

Input<br />

0.01 F<br />

15 k 0.01F<br />

270 k 47 k<br />

V<br />

2<br />

8 1<br />

3<br />

<br />

4 Output<br />

V<br />

Control<br />

voltage<br />

ICI NTE778A<br />

Q1 MPF102<br />

Figure 12-8<br />

Low-pass filter.<br />

R1<br />

R2<br />

C2<br />

V<br />

3<br />

8<br />

1<br />

2<br />

<br />

4<br />

V<br />

C1<br />

R3<br />

R4<br />

R 1 R 2<br />

C 1 C 2<br />

1<br />

FC <br />

2 R1C1<br />

A R 4<br />

R 3<br />

R 3 0.586 (R 4 )<br />

ICI NTE778A<br />

Figure 12-9<br />

High-pass filter.<br />

C1<br />

C2<br />

R2<br />

V<br />

3<br />

8<br />

1<br />

2<br />

<br />

4<br />

V<br />

R1<br />

R3<br />

R4<br />

R 1 R 2<br />

C 1 C 2<br />

FC <br />

A R 4<br />

R 3<br />

1<br />

2 R1C1<br />

R 3 0.586 (R 4 )<br />

ICI NTE 778A

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