Article
Slave Flash with Red-Eye Delay
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Digital cameras are becoming more and more affordable. At the economy end of the market cameras are usually equipped with a small built-in flash unit that is ideal for close-ups and simple portraiture. The power rating of the built-in flash unit is quite low so that any subject further away than about 2 to 3 metres (maybe 4 m if you are lucky) tends to disappear into the gloom. You soon become aware of the limitations if you need to photograph a larger group of people say at a function under artificial light in a large hall or outdoors. The majority of these cameras are not fitted with an accessory socket so it is not possible to simply connect a second flash unit to increase the amount of light.
Materials
Gerber file
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PCB
Component list
Resistors:
R1, R3 = 100k
R2 = 100?
R4, R5 = 220k
R6 = 1k
Capacitors:
C1, C3 = 10µF 16 V radial
C2, C4 = 100nF
C5 = 47nF
Semiconductors:
D1 = TLRH180P (Farnell # 352-5451)
D2, D3 = BAT85
IC1 = 4538P
IC2 = MOC3020
T1 = BC547B
Miscellaneous:
Bt1 = two 1.5V batteries (LR44) with PCB mount holder
S1 = 3-position slide switch
PCB, ref. 040070-1 from The PCBShop
Cable or adaptor for external flasher
R1, R3 = 100k
R2 = 100?
R4, R5 = 220k
R6 = 1k
Capacitors:
C1, C3 = 10µF 16 V radial
C2, C4 = 100nF
C5 = 47nF
Semiconductors:
D1 = TLRH180P (Farnell # 352-5451)
D2, D3 = BAT85
IC1 = 4538P
IC2 = MOC3020
T1 = BC547B
Miscellaneous:
Bt1 = two 1.5V batteries (LR44) with PCB mount holder
S1 = 3-position slide switch
PCB, ref. 040070-1 from The PCBShop
Cable or adaptor for external flasher
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