This circuit consists of an echo or reverberation chamber for sound systems and must be interspersed between a preamplifier and the input of a power amplifier. The input signal must consist only of low and medium frequency components, with the treble eliminated and at the output we must use a filter that eliminates the clock frequency or components of this signal that may appear at the output. The transit time of the signal and the passing band are given by the clock frequency that should be between 20 and 30 kHz. The clock can be generated by a conventional CMOS oscillator, as shown in the figure.
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