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用两个OPA2604音频放大器将负载输出电流增加两倍
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2009-06-06
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Headphones typically have an impedance of 40W to 300W.
By using the dual OPA2604 and four resistors one can
economically drive a 2.8V peak signal into the 40W headphones.
Figure 1 illustrates a circuit that can be used to drive loads
that exceed the output current capabilities of an operational
amplifier, but not enough to require the use of a power
operational amplifier. The OPA2604 used in this application
is a dual, FET-input operational amplifier that can typically
sink or source 35mA on the output.
By using the dual OPA2604 and four resistors one can
economically drive a 2.8V peak signal into the 40W headphones.
Figure 1 illustrates a circuit that can be used to drive loads
that exceed the output current capabilities of an operational
amplifier, but not enough to require the use of a power
operational amplifier. The OPA2604 used in this application
is a dual, FET-input operational amplifier that can typically
sink or source 35mA on the output.
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hiways
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