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Results tagged with amplifier
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user 6127
An amplifier can be used to adapt the range of a signal to a requirement, to make it more robust for transmission, or to satisfy interface requirements (like input/output impedance).
1
vote
Unusual opamp topology: driving a dummy load and using supply currents to drive common-source
See also this (recent) question: Increasing Speed of Bootstrapped Amplifier
Advantages:
Disadvantages: …
2
votes
class AB audio amp clipping vs. heat
As the output voltage increases, the voltage dropped across the output transistors decreases, but the output current increases.
https://www.updatemydynaco.com/documents/Class_B_Amplifier_Dissipation_ …
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3
votes
Understanding Operational Transconductance Amplifiers
The bias current iabc controls the bias current for the whole amplifier, much like with the LM346. Hooking up the output buffer to the output with nothing between gives you an uncompensated opamp. …
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1
vote
Accepted
As I increase the volume of this amplifier the sound gets choppy and the negative power supp...
You should not have the amplifier running on +5/0V, it should run on +5/-5. …
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2
votes
Accepted
Why is input impedance matching done for amplifiers?
Impedance matching is important in RF circuits to prevent reflections. When the input impedance of the load matches the characteristic impedance of the transmission line there is no reflection at the …
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0
votes
Noisy BTL Audio Amplifier Circuit
From the NE5532 datasheet:
You will have to use a different opamp or a higher supply voltage of at least +-5V (10V single supply).
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2
votes
Problems in push-pull biasing
When making a class AB amplifier with BJTs you need to include emitter resistors. …
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8
votes
Accepted
How does the resistor at the tail act as a current source in a differential pair?
An ideal current source has infinite output impedance (i.e. \$dV/dI = \infty\$). A real current source is equivalent to an ideal current source in parallel with some finite output impedance Ro.
A cu …
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4
votes
Accepted
My non-inverting amplifing circuit is always giving constant output values
Read the datasheet before choosing an op-amp.
You are violating the recommended supply voltage range
and the input common-mode voltage range
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1
vote
How to keep decompensated op amp in linear region?
The second one probably would have worked if Q1 was instead a MOSFET. Both introduce substantial nonlinearity near the threshold. Here's an alternative.
Something like this:
simulate this circ …
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3
votes
Highly Distorted Output of Class B Power Amplifier
It is the amplifier oscillating at high frequency because +20/-20V have no bulk capacitance. …
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3
votes
Function of Specific Capacitor in Audio Amplifier's Negative Feedback
With C2 the amplifier has a DC gain of 1. Without it, 23. The AC gain is 23. …
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3
votes
Accepted
Simple BrainTeaser: Running an AC current between two independent amplifiers
Current flows in complete loops.
Charge is the time integral of current. If a current was flowing, the charge of one device would be increasing and the other would be decreasing, creating an electric …
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