Identifikasi Gain Dan Bandwidth Audio Amplifier Menggunakan MCS-51

Like another commonly control-systems, audio amplifiersystem also has characteristics which are defined by their parametrics. Two of them are Gain and Bandwidth. An instrument for measuring Gain and Bandwidth can be built using microcontroller 89C51 from MCS-51 family dan programmed in assembly to generate its frequency (i.e. simulating VCO via software). This instrument use Digital to Analog Converter (DAC) type 0808, Analog to Digital Converter (ADC) type 0804, a Peak Detector Circuit, an Attenuator Circuit and a LCD. In this project, the constructed system can identify maximum Gain at 40 times with four-step increment and Bandwidth in the range from 10 Hz to 200 KHz. The system testing shows that the average error for Gain is less than 5% and approximately 10% for Bandwidth