The stimulating media is made of thin cardboard mounted on a speaker cone, driven by a simple sine wave generator. |
It protrudes slightly through an opening on the top of the enclosure.
Both, the amplitude and frequency of the signal can be preset by means of internal trimmer potentiometers, or externally adjusted by means of external potentiometers. Two toggle switches permit to set one or the other mode for each, the amplitude and the frequency, separately.
The fixed frequency was originally set to 200 Hz.
2011 November 17
reviewed 2011 November 17