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Questions tagged [power-amplifier]

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An electronic amplifier that amplifies a low-power signal in order to make it more suitable for an application that requires higher power (e.g. driving a speaker). Power amplifiers have special challenges compared to lower power amplifiers (e.g. a voltage amplifier, which amplifies a signal's voltage but does not provide much output current capability); such challenges include more board space, cooling components that are dissipating high power, etc.

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I need a power amplifier which amplifies a 0-5V Arduino-generated PWM Signal to a 0-12V Signal with 120W, for powering a ZVS induction heater. Linearity is not important because I can correct the ...
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I've got to do a class B amplifier, and my professor said to rely on this schematic from an old guidance book and I'm trying to replicate it. However, I can't really put my mind into it, especially ...
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Lately I've been reading Bob Cordell's "Designing Audio Power Amplifier" and while reading about the output stage (chapter 2.3 and 3.5) I got curious about the output impedance of ...
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I wanted to use SKY65900-11 2.4-2.5 GHz +28 dBm WLAN Power Amplifier, but when I checked its datasheet, it didn't mention the allowed input value. Has anyone worked with this IC?if YES. So how you ...
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We have designed a Biasing card for an amplifier, In which it consists of a sequencer, a regulator to generate VG and a DC-DC converter along with Hot swap circuit for controlling the VD. I used THN30-...
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I want to design a power amplifier using BJT. My instructor has designed one for himself, but I have some issues in understanding that topic. The problem is to generate \$0.5W\$ across a speaker of ...
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I'm trying to design a voltage to current converter circuit to drive a coil antenna to transmit an analog signal through mutual inductance (very short range, around 3 inches). My frequency range is ...
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I have a question about designing a power amplifier, and I don't know how to match the different stages together! Question: Replace the first stage by folded-cascode and any current source by current ...
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I have the variables - speaker resistance 8 Ohms, amp power 70 Watts per channel @ 8 Ohms, plus speakers max 8 meters from the amp. Bit confused, but intrigued as to how to roughly calculate cable ...
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Roughly a year ago I foolishly decided to try to build this guitar amplifier from a site I found. Long story short, it doesn't work and I have a hard time understanding why. Circuit & test setup ...
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I am trying to rig up Figure 1b and Figure 8 circuit from datasheet to test the power amplifier CA3020A. Not able to understand the datasheet my doubts are figure 1b what are values of vcc1, vcc2 ,...
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I have a question about designing power amplifier. Question: Find the current of the current source I3. My solution: I supposed that the Vbe of Q1 is 0.6v and with Is=10^(-14) calculated the Ic1, ...
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Is the VAS op amp here really configured for a gain of 50? If that's correct, then why does it only output ~1V locally. And then how does ~1V end up becoming full swing on the speaker output? Any ...
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I have an old Grunding V2000 audio amp. It has an output protection circuit that consists of an anti-pop circuit (delayed output relay turn on/instant turn off), and what I think is a DC detection ...
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I have a pair of monoblock tube amplifiers that were designed to run on 117VAC. My wall voltage is about 121-123V. What is the best way to drop the voltage down to an appropriate level? Option 1: ...
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We evaluate RF amplifiers using actual equipment and a simulator (ADS). Since there are few types of inductance values ​​for air-core coils that can be used in matching circuits over 100W, we make our ...
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I’m designing a Class AB amplifier that needs to deliver up to 10 A RMS at frequencies as high as 100 kHz. The output stage uses Darlington transistors (TIP142 for NPN and TIP147 for PNP), powered ...
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I am trying to design a good and simple RF power amplifier for a project of mine, but i am getting nowhere. I am quite new to RF electronics, therefore i would like to ask for some suggestions or ...
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Design an audio amplifier that takes input from a small microphone and can drive a small speaker. A condenser microphone can be used. The audio amplifier must be based on discrete devices and audio ...
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Is there any difference in "Plate Voltage"/"Plate Current" curve between two real vacuum tubes 12ax7?
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I have created an analog synthesizer based on waveforms and signal concepts, but I only focused on the wave shape till now and not on the voltage levels. Now that I want to actually hear the output of ...
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So here it goes, I will keep this issue as simple as possible. I have this Class AB amplifier over here, that brings me a 60 Hz sinusoidal signal up to aprox 15Vp. Must be said that the sinusoidal ...
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I have a old transformer out of an audio amp and want to repurpose it for another DIY amp project using the LM3876. There is a 5 pin connector for the secondaries. I checked voltage potentials across ...
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I'm currently working with an SOT-89 RF power amplifier that I am operating at ~400MHz. To measure the temperature, placed a large (1206) thermistor on top of thermal vias of the amplifier on the ...
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I was looking for an amplifier to make a sound system with, and came across this amplifier that comes with a 30W subwoofer output: https://www.amazon.com/SZHFJCTH-Amplifier-Subwoofer-amplifiers-...
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I am working on the design of a RF power amplifier. I want to use a feedback from the drain to gate. How can I determine the type of feedback (positive,negative) used. I am using a series RC feedback ?...
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I built a simple power amplifier using a IRF510 MOSFET in a common source configuration: The incoming signal is connected to the gate, source goes directly to ground, and the drain has a 100 uH ...
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I was going to replace a relay on an Alesis RA-150 stereo amplifier (a common failure mode) when I noticed some scorched 2W resistors (R401 and R402) and what appears to be an almost burned area of ...
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And of course, what is it used for?
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I have an arbitrary waveform generator that allows me to set the load as 50 Ω or high-Z. This generator is connected to an amplifier that has as input an unbalanced BNC connector, 10 kΩ, single-ended. ...
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I'm building a mini-project containing a laser sensor and a water sprinkler. The goal is to dispense some water when my cat crosses the laser line. The sprinkler motor consumes 1.2A on 5V when under ...
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I try to connect mono microphone to stereo power amp like this image. I connect line of microphone to left and right of power amp input and ground of microphone to ground of power amp but it have no ...
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we are using the LT3021 regulator to generate the gate voltage for the power amplifier. The VG(PA) shutdown control signal is provided by a microcontroller. The VR1 potentiometer is used to set the ...
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I have questions about transformers placed in series and parallel and how they are able to amplify voltage for series and current for parallel without decreasing current/voltage as the case for a step ...
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Hopefully my questions aren't too simple or vague, and will be helpful to anyone else looking for similar information as I am right now. My electrical engineering knowledge is mostly a hobby/self-...
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Today I received this nice 90's Panasonic RX-CT900 boombox in the mail. The specs claims it is 2x60W PMPO (completely unrealistic do-it-only-once or throw-of-a-cliff specification) but in fact it is ...
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This little class-D amplifier PAM8403 will work in Vdd 3.3, good for being fed by an ESP32 on the signals. But it has different Power Vdd and Power GND pins and can also work with 5 V at which it can ...
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I have kind of a newbie question. I did not find much convincing answers online, and I talked myself into a spiral where I am convinced by my calculations but am also convinced I am wrong. Basically, ...
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How do I model the closed loop output impedance of an op-amp with R,L,C parameters? Is there a definite method using simulations? And is it possible to relate it with individual transistor ...
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I already have a directional wi-fi 2.4 antenna with a gain of about 25 dbi. I also have an adapter, however, the power of the receiver/transmitter is not enough. My apartment is on the 9th floor, ...
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I recently decided to conceive a 10W class 446MHz amplifier. I want to be able to amplify a 100mW signal into a 10W, for that i'm going for a two stages amplifier : SKY65162 to amplify the signal to ...
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I am studying microelectronics. I recently got confused about the small signal models and large signal models. After reading an extensive list of sources, I have come up with some pointers which I ...
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I'm trying to design a circuit that can drive an air-core coil with an inductance of 45uH. The coil has a resistance of 0.15 Ohm measured at 50 kHz. The circuit should be able to push up to 100A ...
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how can I calculate the input resistance of this circuit?
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I've been looking everywhere for a common list of abbreviations found on my plate amplifier boards. They're located on the board connections that tell me what wires do what between the tone control/...
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Some amplifiers have used relays to "turn on" the speakers. This is done to prevent the popping sound on the startup of the system and the speaker. When using my previous TDA2050, is it not ...
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I'm trying to understand how to interpret 3rd Order Intercept (OIP3) specifications, and whether or not I can use them to extrapolate performances characteristics, other than just as a measure of ...
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Opamp Labs (which seems to be winding down as of 2024, but is still a company with a venerable reputation) primarily makes/made equipment for commercial Recording and Broadcast applications. Many of ...
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I am currently trying to understand the concept of Generalized Memory Polynomials used in Digital Pre-Distortion and I wanted to seek some answers for some questions that were bothering me. The form \...
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I have some difficulties regarding this single supply diode biased push pull amplifier. Every book and video out there says when one transistor is on the other will be off - just as simple as that. ...
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