How To Troubleshoot And Repair Power Amplifiers
Hello friends, I hope you all are doing great. In today's tutorial, we volition have a expect at How to Troubleshoot Power Amplifiers.Troubleshooting is process to solve the problem is used to repair damage dissimilar instruments, machines or circuits. In the previous tutorial, nosotros accept discussed different amplifiers such as class A, Grade B, and Grade C power amplifiers.
In today'southward mail service, we will take a detailed await at the troubleshooting and reparing of power amplifiers. We volition perform troubleshooting for class A and class AB amplifier. So let's get started with How to Troubleshoot Power Amplifiers.
How to Troubleshoot Ability Amplifiers
- Showtime of all, we discuss troubleshooting of class A amplifier.
Form A Amplifier Troubleshooting
- The proper working-class amplifier is shown in the below effigy where a fine sine wave is generated when the input voltage is practical.
- Let'south take four faulty signal output waves which are normally occurred.
- In figure denoted as 'a' oscilloscope shows a dc level equal to the dc source voltage denoting that transistor is the cutoff mode.
- The 2 main reasons for this condition are given as.
- The PN junction of the transistor is open.
- Resistance R4 of the circuit is open and stops current from collector and emitter.
- In figure denoted equally 'b' the oscilloscope shows a dc bespeak at collector almost equal to the voltage of emitter.
- The main reasons for this country are given as.
- The transistor is a short circuit with transistors.
- Resistance R2 is an open circuit that caused transistor to be in the saturation region.
- In 2nd condition, enough high input signal can crusade saturation at the negative pinnacle which causes short pulses at the output.
- In figure denoted as 'c' oscilloscope display that an output signal which shows that the transistor is in cutoff for a small part of the input signal.
- The two master reasons for this are.
- The position of Q betoken has changed downwards due to high variations in the tolerances of resistance.
- Resistance R1 is an open excursion biased transistor in the cutoff region.
- The figure denoted showed that the input wave is plenty to cause a cutoff region for a small-scale part of the indicate.
- In figure denoted as d oscilloscope bear witness an output signal which shows that the transistor is in saturation by letting a small part of the signal.
- The reasons for this are.
- Faulty value resistance has inverse the position of Q-indicate towards saturation.
- Resistance R2 is an open up circuit that causes the transistor to exist in saturation region and the input wave brought out saturation for a modest part of the signal.
Course AB Troubleshooting
- In the below figure grade AB push-pull amplifier is shown the output of ac signal is also shown correspondent to an air-conditioning input signal.
- The ii faulty output signal is shown in the below figure.
- The figure denoted every bit a prove that only positive one-half of the input wave is exits at the output.
- And so the get-go chief reason is that diode Di is open up. If information technology is error the positive half of the input wave is forward biases the diode D2 and cause transistor Q2 to operate.
- The second possible crusade is that the base-emitter junction of transistor Q2 is open so a positive half cycle of input signal exits on the output equally transistor Q1 is operating.
- The waveform shown in figure b indicates that only negative half of wave is exist at the output.
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- The commencement fault for this is that diode D2 is an open circuit. If this is error negative one-half of input wave forrard biases diode D1 and put the half indicate at the base of operations of transistor Q1.
- The 2nd error is that the base-emitter junction of transistor Q1 is open due to that negative half of the input wave display at the output since transistor Q2 is operating.
And so, friends, information technology is a detailed post well-nigh How to Troubleshoot Ability Amplifiers if you have any questions near it ask in comments. Thanks for reading.
Author: Henry
//world wide web.theengineeringknowledge.com
I am a professional engineer and graduate from a reputed engineering university also have feel of working as an engineer in dissimilar famous industries. I am also a technical content author my hobby is to explore new things and share with the world. Through this platform, I am also sharing my professional and technical noesis to engineering students.
How To Troubleshoot And Repair Power Amplifiers,
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