OPA227 Datasheet, PDF (17/25 Pages) Burr-Brown (TI) – High Precision, Low Noise OPERATIONAL AMPLIFIERS

1kΩ
Audio
In
+15V
0.1µF
1kΩ
1/2
OPA2227
This application uses two op amps
in parallel for higher output current drive.
FIGURE 17. Headphone Amplifier.
1/2
OPA2227
–15V
0.1µF
R₁
7.5kΩ
Bass Tone Control
R₂
50kΩ
3 ^CW 1
2
Midrange Tone Control
C₁
940pF
R₃
7.5kΩ
R₁₀
100kΩ
R₄
R₅
50kΩ
2.7kΩ
3 ^CW 1
V_IN
R₆
2.7kΩ
2
C₂
0.0047µF
R₇
7.5kΩ
Treble Tone Control
R₈
50kΩ
3 ^CW 1
2
R₉
7.5kΩ
C₃
680pF
200Ω
200Ω
To
Headphone
R₁₁
100kΩ
2
6
OPA227
3
V_OUT
FIGURE 18. Three-Band ActiveTone Control (bass, midrange and treble).
OPA227, 2227, 4227
OPA228, 2228, 4228
17
SBOS110A
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