Do you marvel the place your favourite electronics come from? The brief-circuit present restrict is set to about 4.5 amps peak, which can deal with typical speaker masses.(It should, after all, produce increased peak currents because the output voltage swing approaches the rail.) If you’re going to be running a few of those excessive-end audio system with impedance minima of half an ohm, or that keep reactive throughout a lot of the audio band ( ie, zero.5 +j3.2 ohms) you’ll probably already own a greater amp than this.
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Its gain is barely about three.9 as a result of the high output impedance of the drain of the FET contained in the electret microphone causes U1a’s effective enter resistor to be about 12.2K. C2 has a reasonably excessive value in order to move very low frequency (about 20 to 30Hz) heartbeat sounds.
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