Snmek 1

Anglicky v odbornch pedmtech"Support of teaching technical subjects in EnglishEducational program: Mechanic - electrician

Title of program: Technical trainingII. class RC oscillatorWorked out: Bc. Chumchal Miroslav

Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk republiky.

Scheme of the RC oscillatorComponents specificationRecessing drawing from the side of elementsRecessing drawing from the side of jointsDescription of connectionStudents activities

Oscillators

The RC oscillator

Components specification Component Value R1-R4 1K5 R5 M1 Rc 2K7 C1-C3 M1 Cv 5M T1 BC 548 ( NPN ) Ucc 5V

Recessing drawing

5

Recessing drawing from the side of joints

Description of connectionSignal from the collector T1 is bringing across the four- pole composed from capacitors and resistors on base of the transistor. The four- pole moved round slight of signal phase about1800. The value of the four- pole components determining a frequency on which the oscillator oscillating.The operating point of transistor is positioning by resistor R4.The signal is withdrawing from the collector T1 across a coupling capacitor Cv. The oscillator is supplying by ss. voltage 4,5V and taking from source a current about 1,5 mA.

Explain function of nf. oscillator.For what is a resistor R4 in a scheme.Explain a procedure of measuring by Lissajous figures.

Students activities control questions

Draw a block scheme for measuring of progress of nf. signal.Use a Lassajous figures for finding a oscillator frequency .Take down a voltage dependence on frequency to the graph.

Practice students activities

Vlastn poznmkov seitwww.wikipedia.org/wiki/nf osciltory Literature used