# Educational program: Mechanic – electrician Program title: Technical training II. class Correction amplifier Worked out: Bc. Chumchal Miroslav Projekt.

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Educational program: Mechanic – electrician Program title: Technical training II. class Correction amplifier Worked out: Bc. Chumchal Miroslav Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

 Scheme of connection T3 in correction amplifier  Connection of corrections of amplifier  Description of function of correction amplifier  Components specification of amplifier  Common unit of voltage and correction amplifier  Students activities

- Regulation of depth and pitch ( adapt to peculiarities of human hearing) - The main part of correction amplifier are circuits made up with R- C elements - Regulation of pitch level regulating by P1, depth level by P2 - Small capacity give a big resistance to medium and low frequency. High is OK. - High level of frequency badly came through by a big resistance. Low level of frequency is OK. - Signal from output of voltage amplifier come over the P1, separating R2 and P2. The end of the resistance line P1 and P2 is connected by Cv to the point where is the opposite phase of signal, leads to reduction. It is because the part of potentiometer line interfering to the circuit of feedback bond, leading from T3 output across R4 on input T3 - For the good working of the whole correction amplifier, their input have to be connected to the small output resistance of pre- amplifier and output of the amplifier is not to be allowed loading by small input resistance of the ending stage.

Components Value R1 4K7 R2 4k7 R3 22k R4 1K P1 50K/N P2 50K/N C1,C2 68n C3 2n2

- The voltage and the correction amplifier - Filtration element in circuit of power supply voltage, preventing of feedback bond and vibrationing the whole amplifier. - To prevent of overexcited of the amplifier, set up by trimmer on input such a input level that the signal during the operating of the potentiometer would not be distortion. - T3 has got a small power supply voltage like the level before- 13V. - During the setting of working point is giving, that T3 has setting of working point with the assistance of divider in base T. - Max. Uvýst=4V - Icc = 5mA - Unap.=15V - Uce=20V

 For what the correction amplifier is working for us?  What function of the voltage unit is, and where is this unit connected?  What class of amplifiers using at the correction amplifiers do you know?  What meaning has got the indicate of the N and G at the potentiometer behind a value, for example 50K/N or M1/G.

 Design a connection of corrections on a graph paper according to the photo number 4.  This connection realize on a printed wiring and take their measurement.

 Poznáváme Elektroniku I.,Václav Malina, Vydalo nakladatelství KOPP,České Budějovice, 1996  Vlastní poznámkový sešit

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