전기전자기초실험 Chapter 6 Audio Amplifier Circuit DesignPre-report

소개

2011년 2학기 전기전자기초실험 보고서입니다. 전부 다 영어로 작성되어 있으며, 예비보고서의 경우 주석 충분히 달려 있습니다. 베끼지 않고 작성하여, 이 자료를 쓰셔도 Cheating의 염려가 없습니다.

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본문내용

① Explain the mechanism of power supply in this experiment.
There is a power supply circuit for an audio amplifier in fig 6-1. This circuit has an input of AC voltage, and output of DC voltage, passing through the circuit. As we experienced before, diode bridge circuit makes DC voltage rectifying AC input voltage. Capacitor makes better shape of DC, and voltage regulator makes stable 5V DC, to charging on capacitor.

② Understand the elements used in each step, then analyze circuit with respect to following instructions.
1) characteristics of transformer
Transformer is an electric device that changes AC voltage to a higher or lower value. It uses mutual induction, which means that changing magnetic field induces a varying electromotive force(EMF). Input voltage VP(Primary voltage, 120Vrms, 60Hz) changed to lower voltage.∙Reference
Transformer[Online]. Available: http://en.wikipedia.org/wiki/Transformer


2) bridge rectifier
It is an circuit that we experimented on chapter 4. This is a full-wave rectifier that made by 4 diodes. It makes transformed AC voltage to DC voltage. Compared with center-tapped rectifier, it has double voltage efficiency(There is a larger voltage drop, 1.4V, but it can be neglected compared with multiple). Diode bridge[Online]. Available: http://en.wikipedia.org/wiki/Bridge_rectifier


3) capacitor used in each step
Capacitor has an ability of charging voltage, and This DC circuit, it is used to stabilizes DC voltage. Voltage made by bridge rectifier has bumpy shape, and capacitor can make it more smooth. This process makes circuit more stable.

참고자료

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