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Brief description of the drawings
FIG. 1 is a connection diagram of the hearing aid circuit of the embodiment of the present
invention, FIG. 2 is a diagram showing the boundary of the frequency response curve by
adjustment of resonance peak control means, and FIG. It is a figure which shows the boundary of
a curve. DESCRIPTION OF SYMBOLS 10 ... Hearing aid, 12 ... Microphone, 14 ... Integrated circuit,
16 ... Reservoir, 18 ... Potentiometer, 20 ... Capacitor, 22 ... Potentiometer, 24 ... Capacitor, 26 ...
Resonance peak control means.