![]() These batteries’ positive and negative supply voltages are provided to the operational amplifiers used in all of the filters. As a DC source is required to bias the op-amps, the batteries provide the negative and positive voltages. The equalizer circuit is built by assembling the following components…Ī power supply –A dual-power supply is used to power the filter circuits, using two 9V batteries. ![]() Afterward, the frequency bands are combined into one audio signal and passed to a power amplifier and speaker. The gain for the different frequency bands is controlled through variable resistors, connected at the filters’ input.
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