Patent ID: 7769190

Claim:
An audio signal processing circuit comprising: an operational amplifier formed over an insulating substrate and comprising a thin film element, the operational amplifier including an input terminal and an output terminal; a first thin film resistor formed over the insulating substrate, a first terminal of the first thin film resistor being electrically connected to the input terminal of the operational amplifier, and a second terminal of the first thin film resistor being electrically connected to the output terminal of the operational amplifier; a second thin film resistor formed over the insulating substrate, a first terminal of the second thin film resistor being electrically connected to the input terminal of the operational amplifier and the first terminal of the first thin film resistor; a first chip capacitor mounted over a flexible printed circuit connected to the insulating substrate, the first chip capacitor being electrically connected to a second terminal of the second thin film resistor, and a smoothing circuit and the smoothing circuit comprises a third thin film resistor and a second chip capacitor, wherein a first terminal of the third thin film resistor is electrically connected to the first thin film resistor, and wherein a second terminal of the third thin film resistor is connected to the second chip capacitor.