RelaiXed
Preamplificador simétrico con relés
Publicado en Elektor n° 344, Febrero 2009
Los preamplificadores analógicos, sin importar en qué estén basados, transistores, válvulas o integrados, tienen una característica común: el potenciómetro estéreo para el ajuste de volumen. Aquí mostramos una alternativa mejor tanto técnica como esencialmente, que funciona mediante relés y resistencias, dispone de entradas y salidas simétricas y además sigue siendo regulable.
Resistencias:
R1D (1) = 100 Ω, 1%, . W
R2D, R3D, R4D (3) = 5,6 k Ω, 1%, . W
R5D / R6D (2) = 220 Ω SIL fuente de alimentación
R1R, R1L, R17R, R17L (4) = 2,21 k Ω, 0,1%, 1 W
R2R, R2L, R21R, R21L (4) = 68 k Ω, 0.1%, 1 W
R3R, R3L, R22R, R22L, R10R, R10L, R29R, R29L (8) = 10 k Ω, 0,1%, 1 W
R4R, R4L, R23R, R23L (4) = 39 k Ω, 0,1%, 1 W
R5R, R5L, R24R, R24L (4) = 2,7 k Ω, 0,1%, 1 W
R6R, R6L, R25R, R25L (4) = 22 k Ω, 0,1%, 1 W
R7R, R7L, R26R, R26L (4) = 5,6 k Ω, 0,1%, 1 W
R8R, R8L, R27R, R27L, R9R, R9L, R28R, R28L (8) = 15 k Ω, 0,1%, 1 W
R11R, R11L, R30R, R30L (4) = 56 k Ω, 0,1%, 1 W
R12R, R12L, R31R, R31L (4) = 1,8 k Ω, 0,1%, 1 W
R13R, R13L, R32R, R32L, R16R, R16L, R18R, R18L (8) = 100 k Ω,
0,1%, 1 W
R19R, R19L, R34R, R34L (4) = 4,42 k Ω, 0,1%, 1 W
R15R, R15L, R20R, R20L (4) = 100 Ω, 0,1%, 1 W
R1P, R9P, R20P, R24P, R8P, R15P, R28P, R30P (8) = 100 Ω, 1%, ¼ W
R2P, R10P, R17P, R23P, R26P (5) = 1,5 k Ω, 1%, ¼ W
R3P, R11P, R14P, R21P (4) = 2,2 k Ω, 1%, ¼ W
R4P, R22P (2) = 330 Ω, 1%, ¼ W
R5P, R18P, R25P, R29P (4) = 3,3 Ω, 1%, ¼ W
R6P, R19P, R31P, R12P, R16P (5) = 1k Ω, 1%, ¼ W
R7P, R13P (2) = 5,6 k Ω, 1%, ¼ W
R27P (1) = 47 Ω, 1%, ¼ W
Condensadores:
C1P, C3P, C6P, C8P, C24P, C25P, C26P, C28P, C23P, C27P, C1D, C2D
(12) = 47 nF, cerámico multicapa
C2P, C4P, C7P, C9P, C1R, C2R, C1L, C2L (8) = 10 nF, cerámico
multicapa
C10P, C16P, C11P, C17P, C3D, C22P (6) = 100 μF / 35 V
C12P, C13P, C14P, C15P, C18P, C19P, C20P, C21P (8) = 470 μF / 35 V
C5P (1) = 100 nF, cerámico multicapa
C39P (1) = 330 nF, MKT
C30P, C33P, C35P, C37P (4) = 1 nF, FKP
C29P, C31P, C32P, C34P, C36P, C38P (6) = 1 μF, MKT
Semiconductores:
D1P, D2P, D3P, D4P, D5P, D6P, D7P, D8P (8) = MBR1100
D9P, D10P, D1D, D2D, D3D, D4D (6) = 1N4148
L1P (1) = LED de 3 mm, rojo
L1D, L2D (2) = Kingbright SA39, Avago HDSP315
Q1P, Q2P, Q1D, Q2D (4) = BC337
Q5P, Q6P (2) = BC327
Q3P, Q4P (2) = J310
U1P, U2P, U1R, U1L (4) = LM4562
U3P, U4P (2) = TL431
U5P (1) = LM7812CT
U6P (1) = LM2940-5.0, L4940-5.0
U1D, U2D (2) = PIC16F819-I/P
U4D, U5D (2) = ULN2003A
U3D (1) = SFH5110, TSOP4838
Varios:
K1A, K2A, K3A, K4R, K4L,
K5R, K5L, K6R, K6L, K7R,
K7L, K8R, K8L, K9R, K9L,
K10R, K10L, K11R, K11L, K12R,
K12L, K13R, K13L (23) = TQ2, FP2, G6H
J1R, J1L, J2R, J2L, J3R, J3L (6) = conector RCA
J4R, J5R, J6R, J4L, J5L, J6L (6) = Neutrix NC3FAH, NC3FAAH
J7R, J7L (2) = Neutrix NC3MAH, NC3MAAH
J1P, J2P (2) = Molex Header de 4 pines, ancho de 2,54 mm
J1D, J2D (2) = Molex Header de 5 pines, ancho de 2,54 mm
J3D (1) = Molex Header de 2 pines, ancho de 2,54 mm
S1D (1) = selector rotatorio (rotary switch)
Transformador 2x 18 V, alrededor de 5 VA
Transformador 2x 6 V, alrededor de 5 VA
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