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Slave Flash for Digital Cameras

Don’t throw away your old flashlight!

Slave Flash for Digital Cameras
Although most digital cameras have a built-in flash, a connection for an external flashlight is rarely seen. Still, on some occasions it’s useful to have just a tad more light and that’s why we propose a simple add-on.As many of you will be able to avow, the light capacity of the flash facility on low-cost digital cameras is often marginal if not insufficient. Problems typically occur where the object to be photographed is too far away, or if a (very) short shutter time is required. In those difficult cases, the slave flash we’re about to describe may come in really useful.The idea is simple: detect the flash from the camera and use it to trigger a powerful external flashlight with the aid of a thyristor.
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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.

Extra info, Update
The parts list should be corrected to readR1 = 3k3R11 = 68kT4 = BC556
R1 = 27kOhm
R2 = 390kOhm
R3 = 56kOhm
R4,R5 = 10kOhm
R6 = 1kOhm
R7 = 2kOhm 7
R8 = 2kOhm 2
R9,R10 = 470kOhm
R11 = 180kOhm
R12 = 4MOhm 7
R13 = 1MOhm
P1 = 250kOhm preset
C1,C6 = 100nF
C2 = 1nF
C3 = 220nF
C4 = 1ยต F 16V
C5 = 2nF2
D1,D3 = 1N4148
D2 = LED, 3 mm, low current
T1 = BPW40
T2,T3 = BC547
T4 = BC557
Th1 = TIC106
IC1 = 4017
IC2 = SFH601
Bt1 = 9-V battery with clip-on lead
S1 = pushbutton with 1 make contact
K1 = 20-way boxheader with jumper, or a double-row pinheader (2 x 9) with jumper
PCB, available from The PCBShop, ref. 040224.
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