Infrared remote control
for Sony MZ-R30 MiniDisc Walkman, a useful add-on for a popular player

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Materials
Component list
Resistors:
R1 = 56k?
R2,R3 = 10k?
R4,R20 = 4k?7
R5,R6 = 2k?2
R7 = 27?
R8,R13,R15 = 1k?5
R9,R10 = 1k?3
R11 = 56?
R12 = 1k?8
R14 = 150?
R16,R17 = 2k?
R18 = 100?
R19 = 5k?6
R21 = 680?
P1 = 1k? preset H
Capacitors:
C1 = 2µF2 25V radial
C2 = 4µF7 16V radial
C3-C7 = 100nF
Semiconductors:
D1,D3 = low-current LED
D2 = 1N4001
T1,T2 = BC550
IC1 = HT12D (Holtek) (Maplin)
IC2 = 4028
IC3,IC5,IC6 = 4016
IC4 = LP2950-CZ5.0
Miscellaneous:
JP1 = SFH506-36
Transmitter (Board section 990075b)
Resistors:
R1,R2 = 10k?
R3,R4 = 2?2
R5 = 10M?
Capacitors:
C1 = 100µF 16V radial
C2,C3 = 100pF
C4 = 100nF
Semiconductors:
D1-D25 = 1N4148
D26,D27 = LD271 or similar IR LED
T1,T2 = BC550
IC1 = HT12A (Holtek) (Maplin, Farnell)
Miscellaneous:
S1-S11 = pushbutton, PCB mount, Multimec or D6-R-RD
BT1 = 2 off AA or AAA penlight battery
X1 = ceramic resonator, 455kHz (e.g., SB455E) (Mainline, 0870 241 0810)
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