Ground wire noise eliminating circuit
A technology of noise elimination and ground wire, which is applied in the field of ground wire noise isolation unit, can solve the problems of sound quality impact, large volume of audio transformer, high cost, etc., and achieve the effect of being conducive to production, simple circuit and low cost
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[0032] First, explain the root of ground noise based on signal analysis:
[0033] Specific circuit analysis such as Figure 5 As shown, the ground noise U G The output equivalent resistance RO and the input equivalent resistance RI will be divided into the signal input terminal of the power amplifier A. Because under normal circumstances, RI is much larger than RO, the ground noise U G It is equivalent to adding all of it to the input of power amplifier A, which means that a ground noise U is superimposed on the signal. G ’, this ground noise U G ’Although it is small, it will become very large after passing through the power amplifier A.
[0034] Second, explain the core of the present invention based on the source of ground noise:
[0035] Such as Image 6 , The ground noise elimination circuit of the present invention adds a differential amplifier U3-A between the power amplifier A and the independent sound source device B, and the ground noise voltage U between the power amplifier...
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