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Mini Stroboscope

Mini Stroboscope

Physics teachers often rely on test equipment to make certain phenomena observable. Stroboscopes are useful for getting a closer look at vibrating strings and rotating motor parts. Conventional stroboscopes however will often not flash at a rate fast enough to ‘stop’ the motion for observation. The author is of the belief that a hands-on physical demonstration is worth a hundred hours of ‘chalk and talk’ whiteboard explanations.

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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,R6 = 4.7kOhm
R2 = 22kOhm
R3,R5 = 1kOhm
R4 = 2.2kOhm
R7.R8.R9 = 1Ohm
R10 = 220Ohm
R11 = 10kOhm
P1 = 47kOhm, potentiometer, linear
C1 = 1000µF 10V, radial, pitch 5mm, diam. max. 13mm, 1 A ripple current (Farnell # 1165601)
C2,C3,C5,C7 = 100nF, MKT, pitch 5 or 7.5mm
C4 = 2.2nF, MKT, pitch 5 or 7.5mm
C6 = 22nnF, MKT, pitch 5 or 7.5mm
D1 = 1N4148
D2 = BAT42
D3 = Power-LED, OSRAM type LCW CQ7P.PC-KTLP-5J7K
T1 = BC546
T2 = BC639
T3 = IRLU024NPbF (TO-251AA)
IC1 = TS556 or TLC556 (DIP16)
S1 = on/off switch, 1 A
S2 = on/off switch
LS1 = loudspeaker, 8Ohm 200mW
BT1 = 4 pcs AA alkaline battery with holder
3 pcs 2-way PCB screw terminal blocks, pitch 5mm, for BT1, S1 and D3
3 pcs 2-way pinheader, pitch 0.1”, for LS1, S2 and P1
PCB # 120055-1
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