Anglicky v odborných předmětech "Support of teaching technical subjects in English“

Snmek 1

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

Title of program: Technical trainingII. classThe powerful amplifiersWorked 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.

Description of the powerful amplifierTerminal stage with complementary couple of the powerful transistors.Scheme K.S. (t.s.) with complementary couple of the powerful transistor.Measuring of frequency characteristic.Internal connection of the integrated circuit of the amplifier.Work with catalogueStudents activities

The powerful amplifier

Job of the powerful amplifier is deliver the required performance to the load of the amplifier ( loudspeaker ).The performance of the amplifier is product of voltage and current P=U.I, P=U2/Rz ( W, V, ).Basic parameters: - frequency attenuation characteristic ( 20 Hz 20 KHz ) - output performance - nonlinear shape distortion - distance - brum

Description of the powerful amplifier

Terminal stage with complementary couple

Pi napjen jednoduchm zdrojem napt Ucc je nutno zapojit oddlovac kondenztor.4If we bring on the corporate base sin. signal, each of the transistor choose the own half-wave.The current passing alternating by one and than by second transistor.In emitters connection point T1, T2 arising an alternating voltage. From this point is taking an alternating voltage, performance.It is necessary to split off speaker by galvanic way through the C1 so that it would not cause the short- circuit of T1.If we connect voltage power supply, the both T is passing the standstill current which is very small. It is increasing with bringing input signal.By the both of T is passing the same current, the voltage of the source is distributing on both transistors by the same amount. Complementary couple

5Start measuring on frequency 1kHz, set up the level of signal 0 dB on output.Select the amount of the input signal U1 so that it is equal to the half power of the amplifier.Volume controller on max level, pith and depth controller set up on medium value of potentiometers.Measuring on fixed frequency of acoustics band.To the prepared table write down the resultant values.Resultants graphically display.

Measure of the frequency characteristic

Stanoven kmitoty: 100 Hz, 200 Hz, 500 Hz, 1kHz, 2KHz, 5kHz, 10 KHz, 15 KHz, 20 KHz.6 Internal connection of the amplifier integrated circuitChip miniature desk of semiconductor ( Si ), on which there is the whole connection.Necessary number of active elements, transistors, the next parts are subsidiarities circuits. It is as a protection against thermal or power overload, it automatically setting the work point.Types of the casesSize of the cases, maintenanceSimplicity connection of I.O. outletCooling of integrated circuits

Explain the function of the powerful amplifiers.Work with catalogue, explanation of concepts in the catalogue.Explain internal connection of integrated circuit.

Students activities control questions

Interconnect pattern practice desks of voltage, correction and final stage of the amplifier.Measure current passing through by the powerful amplifier Students activities

Poznvme Elektroniku I.,Vclav Malina, Vydalo nakladatelstv KOPP,esk Budjovice, 1996Vlastn poznmkov seit Literature used