Headphones typically have an impedance of 40W to 300W.By using the dual OPA2604 and four resistors one caneconomically drive a 2.8V peak signal into the 40W headphones.Figure 1 illustrates a circuit that can be used to drive loadsthat exceed the output current capabilities of an operationalamplifier, but not enough to require the use of a poweroperational amplifier. The OPA2604 used in this applicationis a dual, FET-input operational amplifier that can typicallysink or source 35mA on the output.
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