Infrared remote control
for Sony MZ-R30 MiniDisc Walkman, a useful add-on for a popular player
Published in issue 285, February 2000
The MZ-R30 MD recorder comes with its own cable-operated remote control, which is primarily designed for Walkman-ish operation. However, Brian Houghton’s own application for recording choral rehearsals needed to have a means of controlling the stop/start function from a location that made cable control impossible. Here’s how Brian solved the problem — elegantly and without breaking the bank.Rather than starting straightaway with the technical description of the project it may be interesting to tell you some of the design history.I found the website “The Minidisk Community Pages” on http://www.amulation.com/minidisc very helpful with information on how the Sony MZ-R30 remote functions are controlled by different resistance values across a pair of wires.
Receiver/decoder (Board section 990075a)
Resistors:
R1 = 56kΩ
R2,R3 = 10kΩ
R4,R20 = 4kΩ7
R5,R6 = 2kΩ2
R7 = 27Ω
R8,R13,R15 = 1kΩ5
R9,R10 = 1kΩ3
R11 = 56Ω
R12 = 1kΩ8
R14 = 150Ω
R16,R17 = 2kΩ
R18 = 100Ω
R19 = 5kΩ6
R21 = 680Ω
P1 = 1kΩ 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 = 10kΩ
R3,R4 = 2Ω2
R5 = 10MΩ
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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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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