ScienTECH AB65 Скачать руководство пользователя страница 8 | Manualshive

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ScienTECH AB65 Скачать руководство пользователя страница 8

AB65

Scientech Technologies Pvt. Ltd.

8

Buffered Phase-Shift Oscillator :

The buffered phase shift oscillator shown in figure 2 oscillates very close to the
calculated frequency.

Figure 2

The buffer prevent the RC sections from loading each other, hence the buffered phase
shift oscillator performs closer to the calculated frequency and gain. The gain setting
resistor, R1, loads the third RC section, and if the fourth op-amp in a quad op amp
buffers this RC section, the performance becomes idle. Low-distortion sine waves can
be obtained from either phase-shift oscillator, but the purest sine wave is taken from
the output of the last RC section.

This is a high-impedance node, so a high-impedance input is mandated to prevent
loading and frequency shifting with load variations.

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Содержание AB65

Страница 1: ...Operating Manual Ver 1 1 An ISO 9001 2000 company 94 101 Electronic Complex Pardesipura Indore 452010 India Tel 91 731 2570301 02 4211100 Fax 91 731 2555643 e mail info scientech bz Website www scientech bz Toll free 1800 103 5050 ...

Страница 2: ...AB65 Scientech Technologies Pvt Ltd 2 ...

Страница 3: ...ironment Friendly It is mandatory that service engineers use lead free solder wire and use the soldering irons upto 25 W that reach a temperature of 450 C at the tip as the melting temperature of the unleaded solder is higher than the leaded solder AB65 Phase Shift Oscillator Table of Contents 1 Introduction 4 2 Theory 6 3 Experiments 9 Study of Phase Shift oscillator with and without Buffer betwe...

Страница 4: ...B04 Transistor characteristics CE NPN AB05 Transistor characteristics CE PNP AB06 Transistor characteristics CC NPN AB07 Transistor characteristics CC PNP AB08 FET characteristics AB09 Rectifier Circuits AB10 Wheatstone bridge AB11 Maxwell s Bridge AB12 De Sauty s Bridge AB13 Schering Bridge AB14 Darlington Pair AB15 Common Emitter Amplifier AB16 Common Collector Amplifier AB17 Common Base Amplifi...

Страница 5: ...B58 Anderson s Bridge AB59 Maxwell s Inductance Bridge AB64 RC Coupled Amplifier with Feedback AB66 Wien Bridge Oscillators AB67 Colpitt Oscillator AB68 Hartley Oscillator AB80 RLC Series and RLC Parallel Resonance AB82 Thevenin s and Maximum Power Transfer Theorem AB83 Reciprocity and Superposition Theorem AB84 Tellegen s Theorem AB85 Norton s theorem AB88 Diode Clipper AB89 Diode Clampers AB90 T...

Страница 6: ...d phase the circuit produces alternating currents or voltages Two requirements for oscillation are 1 The magnitude of the loop gain AVB must be at least 1 2 The total phase shift of the loop gain AVB must be equal to 0 or 360 If the amplifier causes a phase shift of 180 the feedback circuit must provide an additional phase shift of 180 so that the total phase shift around the loop is 360 Figure 1 ...

Страница 7: ...tangent of 60 1 732 The oscillation frequency with the component values shown in figure 1 is slightly different than the calculated oscillation frequency These discrepancies are partially due to the component variations but the biggest contributing factor is the incorrect assumption that the RC section does not load each other This circuit configuration was very popular when active components were...

Страница 8: ... performs closer to the calculated frequency and gain The gain setting resistor R1 loads the third RC section and if the fourth op amp in a quad op amp buffers this RC section the performance becomes idle Low distortion sine waves can be obtained from either phase shift oscillator but the purest sine wave is taken from the output of the last RC section This is a high impedance node so a high imped...

Страница 9: ...lator with and without buffer between RC sections Equipments Needed 1 Analog board AB65 2 DC power supplies 12V 12V from external source or ST2612 Analog Lab 3 2 mm patch cords Circuit diagram Circuit used to plot different characteristics of transistor is as shown in figure 3 Figure 3 ...

Страница 10: ...requency ____________ 2 Practical value of output frequency ____________ 3 Phase shift between Test Point T1 T2 ____________ 4 Phase shift between Test Point T2 T3 ____________ 5 Phase shift between Test Point T3 T4 ____________ 6 Phase shift between Test Point T4 T1 ____________ To study phase shift oscillator with buffer between RC sections proceed as follows 1 Connect 12V 12V DC power supplies ...

Страница 11: ... value of output frequency _______ 2 Practical value of output frequency ________ 3 Phase shift between Test Point T1 T2 _____ 4 Phase shift between Test Point T2 T3 _____ 5 Phase shift between Test Point T3 T4 _____ 6 Phase shift between Test Point T4 T1 _____ ...

Страница 12: ...AB65 Scientech Technologies Pvt Ltd 12 Data Sheet ...

Страница 13: ...AB65 Scientech Technologies Pvt Ltd 13 ...

Страница 14: ...t to another party d Any attempt is made to service and modify the instrument 3 The non working of the product is to be communicated to us immediately giving full details of the complaints and defects noticed specifically mentioning the type serial number of the product and date of purchase etc 4 The repair work will be carried out provided the product is dispatched securely packed and insured The...

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