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Ear Boggle

Experience an auditory illusion

Ear Boggle
This month we invite all fans of the ‘kitchen table’ series to build a classic auditory illusion that has had psychologists and neuroscientists puzzled for decades. Although we’re presenting a mini project built from a handful of cheap parts, it will not fail to produce stunning effects and results.This article is of the ‘zero-hardware / huge background’ variety and as such fits perfectly in our ‘kitchen table’ series of mini projects aimed not only at developing electronics skills but also at triggering experimentation. This month, a dead simple two-tone two-phase oscillator produces a mind-boggling effect (quite literally) — guaranteed to cause a good deal of wonder & excitement in the physics and electronics classroom.
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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.

Resistors:
R1 = 100kOhm
R2-R5 = 15kOhm
Capacitors:
C1,C4,C5 = 10µF 25V, radial
C2,C3 = 100nF
C6 = 100µF 25V radial
Semiconductors:
T1,T2 = BS170
IC1 = 40106
Miscellaneous:
PCB no. 040118-1, available from The PCBShop (EuroCircuits)
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