1
Amplificador estereo de 250W (125W por por cana) + 70VDC
4.7K
R8
R2
4.7K
D1
R3
C1815
180
R9
24V
1N4007
Q7
C4
C2
47 uF
Q9
C2229
0.7V
R12
0.7V
Entrada
1K
0.47 uF Q2
68K
A1015
C1
68K
33
R6 Q1
2SC3858
TIP42
Q4 C3
D718
C6
Q6
47 uF 33K
681
10K
101
Q3
150
100
R14
R11
0.47
8 ohmios 5 uH
0V
R7
1N4007
D2
R1 R10
C2229
150
C8
0.47 1N4007
D3
R15 R13
100
104
R17
10
10 R16
Q5
101 3.3K
Q10 C5
0.7V
2SA1494
Q8 R4
R5
3.3K
B688
681 C7
- 70VDC
El diagrama eléctrico que muestra una sola etapa del amplificador. amplificador.
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2
Valores recomendados Los valores modificables, están en la siguiente tabla. Esta información le puede ayudar a personalizar el circuito. Los componentes que no se encuentran en la tabla, no se pueden modific mo dificar ar..
VALOR MAYOR QUE EL PROPUESTO
VALOR MENOR QUE EL PROPUESTO
Resistencia de entrada
Aumento de la impedancia de entrada
Disminución de la impedancia de entrada
4.7K
Limitaoras del zener y del transistor de regulación
Distorsión o pérdida de ganancia
Recalentamiento de estas
R4, R5
3.3K
Polarización del par diferencial Disminuye la ganancia
Aumenta la ganancia
R6
1K
Ganancia de retroalimentación
Disminuye la ganancia
Aumenta la ganancia
R7
68K
Ganancia de retroalimentación
Aumenta la ganancia
Disminuye la ganancia
R8
180 ohm
Polarización del transistor onda positiva (TIP42)
Descalibración de las BIAS
Descalibración de las BIAS
R9
10K
Polarización de la base del transistor (TIP42)
Descalibración de las BIAS
Descalibración de las BIAS
R10
150 ohm
Polarización de los transistores Pre- exitadores
Aumenta la ganancia
Disminuye la ganancia
R11
33 ohm
R12, R13
100 ohm
Polarización de los transistores impulzadores
Recalentamiento de los transistores de salida Recalentamiento de los transistores de salida
Menos de 10 ohms Aumento de ruido de cruce Recalentamiento de los transistores impulzadores
R14, R15
0.47 ohm
Polarización de transistores de Recalentamiento de los salida (limitadoras de corriente) transistores de salida
Recalentamiento de los transistores de salida (-0.22)
R16, R17
10 ohm
Red de Zobel o bloqueo de oscilación
Posible oscilación y desestabilización
C1
0.47 uF
Desacople de entrada DC
Aumenta el pop al encender
Recalentamiento de los transistores de salida Recorte de las frecuencias bajas
C2
47 uF
Derivación tensión de alimentación par diferncial
-
C3
47 uF
Derivación tensión de la ganancia
C4, C5
100 pF
Filtro pasa banda
(Mas de 100 pF) aumento de distorsión de frecuencias altas
C6, C7
680 pF
Protección de oscilación
Recorte de frecuencias menores Peligro de oscilación a 100 Hz
C8
0.1 uF
COMPONENTES
VALORES SUGERIDOS
R1 (*)
68K
R2, R3
PROPÓSITO
Regulacipon de BIAS
Red de Zobel o bloqueo de oscilación
Recorte de las frecuencias altas
Recalentamiento de los transistores de salida
Desestabilización de la etapa de regulación
(Menos de 10pF) recorte de frecuencias bajas
Peligro de oscilación
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3
A1015 (PNP) 5 01 1 A
E
valores máximos recomendados Símbolo
A1015 A1266
Unidad
Voltaje Colector - Emisor
VCEO
50
V
Voltaje Colector - Base
VCBO
50
V
Voltaje Emisor - Base
VEBO
5.0
V
Corriente de Colector
IC
150
Corriente de Base
IB
50
Disipación de potencia de colector
PC
400
TJ
125
°C
80 - 240
-
Característica
temperatura de la juntura Ganancia de corriente DC o Beta
C
B
Los Transistores A1015 también los falsifican. Mida el hFE hFE al momento de comprarlos y debe darle un valor aproximado que oscila entre 80 y 240. Otra opción en caso de no conseguirlos es usar los A1266. A1266.
5.1 mm
Los A1015 A1015 están conectados en la configuración conocida con el nombre de “Par “Par diferencial”. diferencial”. Lo dos transistores se encuentran acoplados por el emisor. emisor. (Emisor común). Si medimos en la unión de los emisores de los A1015, A1015, debemos obtener un voltaje de 0.7V, 0.7V, ni más ni menos.
m m 7 . 4
E
C
B m m 8 . 1
0.45 mm 0.5 mm m m 8 . 0
1.3 mm
1.3 mm
m m 7 . 2 1
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4
C2229 (NPN) Los C2229 C2229 son transistores de gran rendimiento que usaremos como transistores pre-exitadores. Son muy usados en aplicaciones de video TV a blanco y negro, conmutación de alta tensión y como impulsores (drivers) en amplificadores de audio.
9 2 2 2 C 2 S
E
C
B 5.1 mm
valores máximos recomendados Característica
Símbolo 2SC2229 Unidad
Voltaje Colector - Emisor
VCEO
150
V
Voltaje Colector - Base
VCBO
200
V
Voltaje Emisor - Base
VEBO
5.0
V
Corriente de Colector
IC
50
Corriente de Base
IB
20
PC
800
TJ
150
°C
70 - 180
-
Disipación de potencia de colector temperatura temperatura de la juntura Ganancia de corriente DC o Beta
m m 2 . 8
E
C
B
0.8 mm
m m 2 . 2
1.0 mm m m 1
0.8 mm
Nota: Nota: El uso de forma continua bajo cargas pesadas (por ejemplo, la aplicación de alta temperatura, corriente, tensión o cambios fuertes de temperatura, etc), pueden causar una disminución de su rendimiento, incluso si las condiciones de funcionamiento están dentro de los valores máximos absolutos. Por eso al momento de diseñar un circuito con el C2229 se debe tener en cuenta las características de funcionamiento medio y las
1.3 mm
m m 5 . 0 1
1.3 mm
2.6 mm 0.6 mm
E
C
B
m m 1 . 4
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5
TIP42C (PNP) Los TIP42 son transistores bipolares de silicio de base negativa. Estos transistores tienen una alta ganancia de corriente. Soportan corrientes hasta de 2 amperios, y son ideales para aplicaciones de conmutación. Estos transistores son muy usados en aplicaciones de audio y amplificadores.
B
C
E A R S E
valores máximos recomendados Característica Voltaje Colector - Emisor
F
Símbolo
TIP42c
Unidad
VCEO
100
V
B
B
Voltaje Colector - Base
VCBO
100
V
Voltaje Emisor - Base
VEBO IC ICM IB
5.0 6.0 10 2.0
V
PD TJ TSTG
2 65
W W/°C W/ °C
-55 a 150
°C
150
-
Corriente continua de Colector - pico Corriente de Base Potencia total de disipación por encima de los 25° Rango de operación de temperaturas temperaturas de la juntura Ganancia de corriente DC o Beta
E T
G
L C
C
M
A
M
K B
C
E
N O
J
DIM
Milímetros
A
10.3 MAX 15.3 MAX 0.8 3.6 3 6.7 MAX 13.6 5.6 MAX 1.3 MAX 0.5 1.5 MAX 2.5 4.7 MAX
B
La estructura estructura de este transistor es PNP Disipación máxima de potencia continua de colector (Pc): 65W Limite el colector DC-base (Ucb): 140V Límite de colector-emisor del transistor de tensión (Uce): 100V Límite de tensión emisor-base (Ueb): 5V Corriente continua Máxima de colector (Ic max): 6A Temperatura límite límit e de unión pn (Tj): 150°C
C
H
A
Características del TIP42c: TIP42c:
P
Q
C D E F G H J K L M N
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6
2SD718 (NPN) - 2SB688 (PNP) Estos transistores son excelentes para usar como impulsores (drivers), sobre todo si se piensa usar altos voltajes. B valores máximos recomendados Característica
2SD718 Símbolo 2SB688
Unidad
VCEO
120
V
Voltaje Colector - Base
VCBO
120
V
Voltaje Emisor - Base
VEBO IC ICM IB
5.0 8.0 16 0.8
V
PD TJ TSTG
80 0.64
W W/°C W/ °C
-55 a 150
°C
55 - 160
-
Corriente de Base Potencia total de disipación por encima de los 25° Rango de operación de temperaturas temperaturas de la juntura Ganancia de corriente DC o Beta
E B
Voltaje Colector - Emisor
Corriente continua de Colector - pico
C
C O D
A
B C E
A
F E
A
G L
H
J
En el caso de trabajar este amplificador a un voltaje inferior a los +/-63 voltios DC (46+46VAC), no es necesario usar estos transistores. Puede usar los TIP41 (NPN) y TIP42 (PNP). Pero pensando en hacer un amplificador ampliable en potencia, colocamos los transistores D718 (NPN) y B688 (PNP), por su gran calidad y potencia. No es necesario disiparlos. Al momento de comprarlos recuerde medir el
M
K
P
DIM
Milímetros
A
22.3 MAX 16.3 MAX 2.7 6.1 15.22 12.8 MAX 4.5 2.4 MAX 3.2 MAX 1.5 5.6 MAX
B C D E F G H I J K
N
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7
2SC3858 - 2SA1494
2 S C 3 8 5 4 3 8 P
Transistores 2SC3858 (NPN) y 2SA1494 (PNP) Aplicación: Uso en audio. Proporcionan hasta 150W. 150W. valores máximos recomendados Característica
2SC3858 Símbolo 2SA1494 Unidad
Voltaje Colector - Emisor
VCEO
200
V
Voltaje Colector - Base
VCBO
200
V
Voltaje Emisor - Base
VEBO IC ICM IB
6.0 17 20 2.0
V
Potencia total de disipación PD por encima de los 25° Rango de operación de TJ temperaturas temperaturas de la juntura TSTG Ganancia de corriente DC * o Beta
200 1.6
W W/°C W/ °C
-55 a 150
°C
30 - 50
-
Corriente continua de Colector - pico Corriente de Base
A A
B
C
E
Los transistores falsificados suelen tener una ganancia (hFE (hFE)) muy alta o excesivamente baja. Esto es debido a que son transistores de menor potencia encapsulados en la carcasa de un transistor de potencia. Siempre mida el h F E al momento de comprarlos y compare con el datasheet. 6 mm
36.4 mm 24.4 mm
NOTA: NOTA: Los transistores de potencia originales son de ganancia baja, que oscila entre 30 y 180, dependiendo del modelo. Los transistores japoneses originales traen una letra adicional que corresponde a la
3 mm
2.1 9
7 m m 4 . 1
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8
Posición de los componentes
Salida R
Salida L 2SC3858
2SA1494 +Vcc
0.47 ohm /5W
0.47 ohm /5W 8 1 7 D
2SC3858
100
100
D718
+Vcc
100
6800/80v
7 0 0 4 N 1
150
K 8 6
7 0 0 4 N 1
150
1N4007
TIP42C
-Vcc
150
0 8 1
1K
K 8 6
3K3
7 K 4
47 uF
C2229
C2229 101 1K
6800/80v
A1015 33K
7 0 0 4 N 1
A1015
C1815
3K3
33K
3K3
3K3
A1015 0.47 uF
V 4 2
+ 47 uF
G
6 Amp
K 8 6
6 Amp
A1015
V 4 2
0.47 uF GND
Entrada L
47 uF
+
G Entrada R
50 v AC
TAP GND
50V AC AC
-Vcc
101
10K 7 K 4
C2229
B688
1 8 6
101
C2229 101
C1815
1 8 6
GND
1N4007
10K
7 K 4
B688
1 8 6
TIP42C
0 8 1
100
33 7 0 0 4 N 1
150
7 K 4
0.47 ohm /5W
0.47 ohm /5W
33 1 8 6
2SA1494
K 8 6
47 uF
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9
Circuito impreso Al derecho para impresión con el método de serigrafía 18.3 cm
m c 2 1
Un circuito impreso es básicamente una lámina de baquelita recubierta con una
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10
Máscara de componentes
Salida R
Salida L 2SC3858
2SA1494 +Vcc
0.47 ohm /5W
0.47 ohm /5W 8 1 7 D
2SC3858
100
100
D718
+Vcc
100
6800/80v
7 0 0 4 N 1
150
K 8 6
7 0 0 4 N 1
150
1N4007
TIP42C
-Vcc
150
0 8 1
1K
K 8 6
3K3
7 K 4
47 uF
C2229
C2229 101 1K
6800/80v
A1015 33K
7 0 0 4 N 1
A1015
C1815
3K3
33K
3K3
3K3
A1015 0.47 uF
V 4 2
+ 47 uF
G
6 Amp
K 8 6
6 Amp
0.47 uF GND
Entrada L
47 uF
+
G Entrada R
50 v AC
Construyasuvideorockola.com
A1015
V 4 2
TAP GND
50V AC AC
-Vcc
101
10K 7 K 4
C2229
B688
1 8 6
101
C2229 101
C1815
1 8 6
GND
1N4007
10K
7 K 4
B688
1 8 6
TIP42C
0 8 1
100
33 7 0 0 4 N 1
150
7 K 4
0.47 ohm /5W
0.47 ohm /5W
33 1 8 6
2SA1494
K 8 6
47 uF
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11
Máscara antisoldante (solder mask UV)
La máscara antisoldante (Solder mask UV), es una pintura especial de secado a los rayos ultravioletas (UV), resistente al calor y a los solventes. Si no la consigue, se
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12
Circuito impreso en modo espejo para impresión i mpresión con el método de planchado 18.3 cm
m c 2 1
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13
Diagrama de conexión del amplificador estéreo
+
Salida R
Salida L
R R
0 1
4 0 1
R R
0 1
a d a r t n E
H u 5
a d i l a S
Parlantes
0 1
L L
0 1
L L 4 0 1
Red de Zobel +
Amplificador Entrada L
Entrada R
5 0v 0v AC AC
TAP GND
5 0V 0V AC AC
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Amplificador monofónico de 125W
14
Salida 2SC3858
2SA1494
8 1 7 D
+Vcc
0.47 ohm /5W
0.47 ohm /5W
100
100
6800/80v
33 1 8 6
+Vcc
7 0 0 4 N 1
150
150
7 K 4
7 0 0 4 N 1
K 8 6
-Vcc
101
10K
0 8 1
GND
1N4007
TIP42C
7 K 4
B688
1 8 6
C2229
C2229 101 1K
6800/80v
A1015
C1815
3K3
33K
47 uF
3K3 A1015 6 Amp
0.47 uF
V 4 2
+ 47 uF
G Entrada
6 Amp
K 8 6
GND
5 0v 0v AC AC
50V AC AC
TAP
Posición de los componentes
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Máscara de componentes
15
Salida 2SC3858
2SA1494
8 1 7 D
+Vcc
0.47 ohm /5W
0.47 ohm /5W
100
100
6800/80v
33 1 8 6
+Vcc
7 0 0 4 N 1
150
150
7 K 4
7 0 0 4 N 1
K 8 6
-Vcc
101
10K
0 8 1
GND
1N4007
TIP42C
7 K 4
B688
1 8 6
C2229
C2229 101 1K
6800/80v
A1015
C1815
3K3
33K
47 uF
3K3 A1015 6 Amp
0.47 uF
V 4 2
+ 47 uF
G
6 Amp
K 8 6
Entrada
Videorockola.com
GND
TAP
5 0v 0v AC AC
50V AC AC
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16
Circuito impreso en modo espejo para impresión con el método de planchado 11.4 cm
m c 1 . 1 1
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17
Lista de materiales Transistores 2 Transistores Transistores 2SC3858 originales o en reemplazo MJL21194 2 Transistores Transistores 2SA1494 originales o en reemplazo MJL21193 2 Transistores 2SD718 o en reemplazo C5198 2 Transistores ransistore s 2SB688 o en reemplazo A1941 4 Transistores 2SC2229 o 2SC2230 2 Transistores 2SC1815 4 Transistores A1015 o A872 2 Transistores TIP42 Condensadores 2 Condensadores de 6800 uF a 80V o 10000 uF a 80V
Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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18
Diagrama de conexión de varios transistores en paralelo + 75VDC
2SC3858 De los D718
2SC3858
2SC3858