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Caught in the Ring Light

LED Ring Light for close-up camera work

Caught in the Ring Light
This Ring Light is an illumination source used with webcams, microscopes and photo cameras. It is mounted around the lens to provide an even illumination when a subject is very close. Ring lights are commonly used for portrait or macro photography, or to illuminate objects under an inspection microscope. Here we build a powerful ring light ourselves from a kit of parts.
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Products
Relevant websites
COMPONENT LIST
LED Ring Light
Resistors (0805)
R1-R5 = 10kOhm
R8 = 1Ohm, 0.33W
(R6,R7 not implemented)
Capacitors (0805)
C1-C8 = 100nF
C9-11 = 10µF
Inductors
L1 = 4.7µH (TDK NLCV32T-4R7M)
Semiconductors
D1-D36 = Cree PLCC4 (CLA1B-WKW)
U1 = MIC3289-24YD6
U2 = PIC12F683-E/SN, programmed
Miscellaneous
K1 = mini DC adapter socket
SW1-SW4 = push button
PCB # 129003-2 [1]
COMPONENT LIST
LED Tester
Resistors (0805)
R1-R3 = 330Ohm
Capacitors (0805)
C1-C4 = 100nF
C5-C7 = 22µF
Inductors
L1 = 4.7µH (TDK VLS3012T-4R7M1R0)
Semiconductors
D1-D4 = LED green (Osram LP T67K-E1F2-25-Z)
D5 = RB160M40
U1-U4 = 74V1G66
U5,U6 = 74V1G14
U7 = NCP1400A
Miscellaneous
K1 = Battery clip (BHX1-1225-PC)
COMPONENT LIST
PWM Dimmer
Resistors (0805)
R1,R2 = 10kOhm
R3,R9 = 470Ohm
R4-R7 = 1kOhm
R8 = 4.7kOhm
Capacitors (0805)
C1,C5 = 100nF
C2 = 47µF
C3 = 10µF
C4 = 220nF
Semiconductors
D1 = MBRS140
D2 = MMBD4148
D3 = BZT52C5V6
Q3 = RFD16n05LSM
U1 = OPA2170
Miscellaneous
K1,K2 = screw terminal block
P1 = potentiometer (Panasonic EVU-E2JFK4B53)
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