Camera on Model Train
view the track from the proper perspective

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Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
R1 = 270?
R2,R4 = 470? (option 1)
R3 = 270k?
R5,R8,R12 = 33? (option 1)
R7,R9,R10,R11 = 33?
R6 = 10k?
Capacitors:
C1,C2 = 22pF ceramic
C3 = 220µF 25 V radial
C4 = 47µF 25V radial
C5 = 470µF 16V radial
C6 = 47µF 16V radial
C7,C9 = 100nF
C8 = 47µF 6V radial
Inductors:
L1 = 33 µH (40 turns. 0.25 mm diam./SWG32 enamelled copper wire on ferrite rod, 4 mm dia., 15 mm long)
L2 = 150 µH miniature choke
Semiconductors:
D1,D3,D10 = 1N4001
D2,D5-D8 = SB130
D4,D9 = 1N4148 (option 1)
D11,D12 = high-power IR-LED (option 1)
T1 = not fitted
T2 = BC847 of BC547 (option 1)
IC1 = LT1301CN8 (Linear Technology)
IC2 = LM2940CT
IC3 = 78L05 (only with 5V camera)
IC4 = PIC16F84 (programmed, for Super-Loco Decoder, # 996523-1
IC5 = ULN2004
Miscellaneous:
X1 = 4 MHz quartz crystal
L1,L2 = miniature bulb 5V/50mA (option 2)
PCB, order code 000129-1
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