Light Therapy Box
Blue LEDs combat the Winter Blues
Materials
Gerber file
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Component list
R1,R6 = 150kOhm
R2 = 2.2MOhm
R3,R8 = 100
R4 = 100kOhm
R5 = 220kOhm
R7 = 10kOhm
R9–R16 = 15kOhm
R17–R58 = 270
P1,P2 = 1MOhm potentiometer, linear
P3 = 100kOhm preset, horizontal
Capacitors
C1,C5,C6,C9 = 100nF MKT, lead pitch 5mm or 7.5mm (0.2” or 0.3”)
C2 = 2.2nF MKT, lead pitch 5mm or 7.5mm (0.2” or 0.3”)
C3 = 82nF MKT, lead pitch 5mm or 7.5mm (0.2” or 0.3”)
C4 = 4.7nF MKT, lead pitch 5mm or 7.5mm (0.2” or 0.3”)
C7,C8 = 1000µF 16V axial, lead pitch 28mm (1.1”)
C10 = 1nF ceramic, lead pitch 5mm (0.2”)
Inductor
L1 = 40µH 2A, axial (Epcos B82111EC23, Farnell- # 9753354)
Semiconductors
D1,D2,D3 = 1N4148
D4.–D87 = blue LED, 5mm, 300mcd, wavelength 465nm, (e.g. Optek OVLLB8C7, Farnell # 1678692)
D88 = Schottky diode 60V 2A, (e.g. STPS2L60, Farnell # 9907637)
T1 = SPP18P06P (P-channel MOSFET 60V 0.13O, Farnell # 1056550)
T2–T9 = BC547B
IC1 = 4093
IC2 = 4060
IC3 = 4015
Miscellaneous
S1 = push button, panel mount
2-way pinheader, right-angled
2-way pinheader
2 3-way pinheader, right-angled
2 3-way socket
PCB # 081066, see www.elektor.com/081066
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