[Resolved] Problem with audio hum when powering from arduino
[Resolved] Problem with audio hum when powering from arduino
May 5, 2015
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This simulation shows a single-supply audio amplifier built around a high-gain op-amp with biasing, AC coupling, feedback control, and an output stage driving an 8Ω load. The input signal is first AC-coupled through a capacitor, then biased to mid-supply using the 56kΩ divider so the op-amp can amplify a sine wave centered at 7.5V. The feedback network (39kΩ / 1.5kΩ) sets the closed-loop gain. The large output coupling capacitor (2.2mF) removes the DC offset so the speaker receives only the AC a
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