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Cmoy headphone amplifier
1.
Cmoy headphone amplifier (© Chu Moy, www.headwize.com)*) R5 opt., 27 .. 47Ohm
R3
R4
1k
10k
V+
2
In
-
U1
OPA132
C1
50k
3
+
0.22uF
R5*
6
27
R2
Out
4
V100k
R1
7
v=
R3 + R4
R3
= 1+
R4
R3
Rin =
R2
OPA132-pin compatible: LM741 (lower Vcc, lower P0)
OPA2132-pin compatible: TL072C, NE5532 (higher Out-Z)
CMoy standard
[Rainer Boettchers, 2003, [email protected]]
2.
Cmoy47 headphone amplifier (© Chu Moy/Apheared, www.headwize.com)R3
R4
10k
1k
V+
2
In
-
U1
OPA132
50k
3
+
0.22uF
R5
1
4
V100k
Out
27
27
C1
R1
7
V+
3
R2
+
7
U2
OPA132
2
-
4
V-
CMoy 47 design
[Rainer Boettchers, 2003, [email protected]]
1
3.
Simple impedance followerV+
2
-
7
U1
OPA132
3
In
+
6
R5
47
Out
4
1M
VR2
pin-compatible opamp:
Impedance follower
[Rainer Boettchers, 2003, [email protected]]
TL072C (lower quiescent current)
4.
Practice amp w/ LineIn & Instr (var. Line-In)1k
2.2k
R6
R7
V+
U2/1
TL072C
3
+
0.22uF
1M
1
5
0.47uF
4
V-
-
7
+
10k
U2/2
TL072C
1M
-
7
10k
2
6
R4
1k
V+
7
2
4
V-
7
3
+
1
R5*
27
Out
4
0.22uF
100k
U1/1
OPA132
100k
LineInR
R8
-
C1
100k
V+
1k
R3
V100k
4.7k
R2
R1
R3
R4
1k
10k
InstrIn
V+
6
100k
-
5
+
0.22uF
R1
4
V100k
100k
100k
U1/2
OPA132
C1
LineInL
7
R2
7
R5*
27
Out
5.
Practice amp w/ LineIn & Instr (const. Line-In)1k
2.2k
R6
R7
V+
V+
-
7
U2/1
TL072C
3
+
0.22uF
1M
1
5
0.47uF
4
V-
-
7
+
R4
1k
10k
U2/2
TL072C
1M
2
6
10k
1k
R3
V+
7
2
4
V-
7
3
+
1
R5*
27
Out
4
0.22uF
47k
U1/1
OPA132
100k
LineInR
R8
-
C1
V100k
4.7k
R2
R3
R4
1k
10k
InstrIn
V+
6
100k
-
U1/2
OPA132
C1
LineInL
7
5
47k
+
0.22uF
4
100k
VR2
7
R5*
27
Out
6.
Battery common rail supply+
470uF
+
470uF
4.7k
3.3k
+9V
LED
4.7k
2 x 9V
-9V
7.
Single supply operation for buffer ampR3
R4
470k
In
620k
0.47u
220p
V+
10k
2
+
6
R2
Single supply operation
[Rainer Boettchers, 2003, [email protected]]
R5*
27
4
V10k
+
100u
0.22u
3
*) R5 opt., 27 .. 47Ohm
U1
OPA132
C1
+
7
g=
Rin =
R3
R4
R3
Out
8.
Musical EQ9.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
Out A
1
27
OPA2132
10k
2
Out B
27
In A
10k
3
0.22u
4
In B
Vcc -
1k
5
4.7u
1k
Vcc+
100k 0.22u
100k
6
4.7u
Gnd
7912
7
8
7812
+
+
9
10
4700u
4700u
11
12
13
-
+
~
~
B80C1500
+
~
~
B80C1500
15V~
15V~
14
15
16
17
CMoy standard, power supply version
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
9
25
26
27
28
29
10.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
1
Out A
47
OPA2132
47
2
Out B
In A
3
In B
4
1M
5
1M
6
Gnd
Vcc+
Vcc -
7
10k
+
8
9
47u
+
10k
47u
10
11
12
13
14
15
16
17
Pickup follower
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
10
25
26
27
28
29
11.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
OPA2132
0
27
27
1
2
3
Out A
27
4
10k
5
Out B
27
In A
10k
OPA2132
6
0.22u
In B
100k
7
Vcc -
1k
8
1k
0.22u
100k
Vcc+
4.7u
9
10
4.7u
Gnd
7912
11
7812
+
+
12
13
4700u
4700u
14
15
16
-
+
~
~
B80C1500
+
~
~
B80C1500
15V~
15V~
17
CMoy 47, power supply version
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
11
25
26
27
28
29
12.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
OPA2132
0
27
27
1
2
3
Out A
27
4
10k
5
In A
7
10k
OPA2132
6
0.22u
Out B
27
In B
220k
Vcc -
1k
8
1k
0.22u
220k
Vcc+
4.7k
9
4.7k
Gnd
10
11
+
+
12
13
14
470u
V-
470u
V+
15
16
17
CMoy 47, battery version
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
12
25
26
27
28
29
13.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
0
1
Out A
27
27
OPA2132
10k
2
27
In A
Out B
Out B
OPA2132
27
10k
Out A
10k
In A
10k
3
0.22u
In B
0.22u
In B
4
1k
100k
5
1k
100k 0.22u
4.7k
0.22u 100k
4.7k
6
1k
100k
4.7k
4.7k
Gnd
7
1k
Gnd
8
+
+
+
+
9
10
11
470u/25V
470u/25V
Vcc -
470u/25V
Vcc+
470u/25V
Vcc+
Vcc -
12
13
Components side view
Print side view
14
15
16
17
CMoy standard, battery version
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
13
29
14.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
CMoy standard, battery version (alternate layout)
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
14
25
26
27
28
29
15.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
0
1
Out A
27
OPA2132
R3
2
Out A
27
27
In A
Out B
Out B
R3
OPA2132
27
R3
In A
R3
3
0.22u
In B
0.22u
In B
4
5
1k
100k
1k
100k 0.22u
10k
0.22u 100k
10k
6
1k
9
10k
Gnd
100u/16V
+
100u/16V
+
Vcc -
100k
10k
Gnd
7
8
1k
100u/16V
+
+
Vcc+
Vcc+
100u/16V
Vcc -
10
11
Components side view
12
13
14
15
R3
gain
4.7k
5.7
2.7k
3.7
1.0k
2.0
Print side view
16
17
CMoy booster, low power battery version
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
15
28
29
16.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
0
1
In N
10k
0.47u
470k
470k
2
27
0.47u
In B
In B
In N
10k
0.47u
Vcc+
470k
27
Vcc+
3
10k
680k
27
27
0.47u
470k
10k
680k
4
680k
680k
7
10u
TL072
10k
+
TL072
10u
10u
Gnd
10k
10k
10u
Gnd
8
9
Components side view
+
6
10k
+
+
5
Print side view
10
11
12
13
14
15
16
17
Single supply pickup booster
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
16
28
29
17.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
0
1
Out A
0.47u
27
OPA2132
10k
2
27
In A 47k
Instr. vol.
Out B
10k
3
0.22u
4
2.2k
0.22u
Pre In
100k
5
4.7k
1k
100k
1k 100k
100k
Pre In
6
Vcc+
0.22u
In B
4.7k
Pre out
Instr
Gnd
7
TL072C
4.7k
47k
1k
1M
1k
1M
Vcc -
8
Gnd
+
+
Gnd
9
10
11
470u/25V
Preamp stage
470u/25V
Vcc -
Vcc+
12
13
Comments:
Main stage
Put feedback resistors on solder
pins to adapt gain to instrument
output level
14
15
May be 10 ... 100k pots;
if > 100k put 10k across
16
17
CMoy practice amp, battery version, const. LineIn
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
17
29
18.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
Volume
1
Input
Headphone
2
3
Out A
4
5
In A
Out B
In B
6
27
7
Vcc -
Vcc+
0.22u
OPA2132
10k
27
8
10k
9
0.22u
10
11
12
100k
470u
+
+
1k
1k
100k
4.7k
470u
4.7k
Gnd
13
14
15
16
17
CMoy standard, battery version, single board
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
18
25
26
27
28
29
19.
01
2
3
470
1k
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
2.2k
4.7k
470 1k
4
1
2.2k 4.7k
1: g = 22
2: g = 11
3: g = 6
4: g = 3
and more
1
2
1
4
3
4
5
6
7
27
Out A
10k
27
In A
10k
8
Out B
OPA2132
0.22u
In B
9
10
100k 0.22u
100k
4.7k
4.7k
11
Gnd
12
13
+
+
14
15
16
470u
470u
Vcc -
Vcc+
17
CMoy standard, switchable gain, battery version
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
19
25
26
27
28
29
20.
01
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0
1
11k
50n
2
11k
11k
3
22n
100k
4
5n
5
3.6k
3.6k
6
7
In 1u
1.8k
5n
100k
500k
8
9
TL072
10
Out
1.8k
1u
Vcc+
220k
11
220k
12
Vcc-
Gnd
13
14
Components side view
15
16
17
Equalizer EQ3
OpAmp audio projects
[Rainer Boettchers, 2003, [email protected]]
Date:
Page:
25 November 2021 17:08
20
25
26
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28
29