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Slave Flash with Red-Eye Delay


Slave Flash with Red-Eye Delay
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1, R3 = 100k
R2 = 100?
R4, R5 = 220k
R6 = 1k
C1, C3 = 10µF 16 V radial
C2, C4 = 100nF
C5 = 47nF
D1 = TLRH180P (Farnell # 352-5451)
D2, D3 = BAT85
IC1 = 4538P
IC2 = MOC3020
T1 = BC547B
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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