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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'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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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 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 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 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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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 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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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 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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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'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 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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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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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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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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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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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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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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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 am recapping an old stereo system, where i came across a 15uf 63v capacitor connected to supply pin (pin 5 of tda2030) and ground.So,can i use 10uf/63v and 4.7uf/63v in parallel to achieve close to ...
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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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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 have an RF power amplifier that is rated for operation between 700 and 2700 MHz. What happens if we drive it at a lower frequency, say 600 MHz? Is there an increased risk in damaging the amplifier? ...
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I am building a vacuum tube RF power amplifier for SSB. Here is the link for the amplifier. https://www.qsl.net/vu2awc/ham_radio_india_v/vu2atn_qro/vu2atn.htm I need to clarify first that I am ...
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I have a number of GU50s from Ukraine - they were a soviet copy of the German LS50 and are apparently seen as a good tube on the HiFi side of things. The datasheets are easy to find but the ones I can ...
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Here is datasheet of the TGA 2214-CP amplifier: TGA 2214-CP The pins can be seen on page 11. It turns out that pin 7 and 9 are very close to the central pin 1, as well as pin 8 and 10 to pin 2 (about ...
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Given that Class E RF amplifiers, even those that generate less than a few watts, can easily generate voltage spikes approaching (or exceeding) 100 V, how can they be homebrew built and experimented ...
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I picked up a Crest ca9 amplifier over the weekend knowing it needed work when I plugged it in And turned it on it. Started letting the smoke out. Long story short, I found a varistor That had blown. ...
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I wonder how these modern transistor guitar amplifiers work. Take for example the Roland Cube Street EX. Max Power Output: 50W (2x25W) Power Supply: AC Adaptor (DC 13V) or 8x Alkaline/NI-MH AA Battery ...
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I am using a "Pulsed biasing board" which provides the drain signal and gate signal to a power amplifier. I am interfacing the same with QPA2935 driver amplifier(DA) Please find the ...
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For a school project, we have to explain this design of a audio amplifier. We have only been able to understand to parts marked with colored rectangles. The design comes from the book audio power ...
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I am design a 1W audio amplifier and i want to have 8V peak to peak output signal but if i increased the R4 resistor then the output signal would be clipped. My input is 0.3V max sinewave. Here is my ...
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Thanks to the help of electronics.SE, I've designed my first power amplifier, intended for transmitting CW on 7 MHz. Before I order parts and build it, I'd request a design review. One important note:...
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Given below is a block diagram of an evaluation-board. It is a pulsed biasing board to a PA. It is designed to produce a pulsed-drain and pulsed-gate signal for the biasing of GaN Power Amplifiers. I ...
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I understood that a MOSFET does not draw current from its gate, and only depends on gate voltage. However, this simple MOSFET circuit shows that when R1 is very low (1 ohm), it works fine, but when ...
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This Pixie III 7 MHz transceiver uses Q2 as a Class C amplifier. What is the purpose of L1? The article only says The value of RF choke L1 is not critical. Since little current passes through it ...
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Class C and class E power amplifiers both distort the waveform yet they are preferred in RF applications. Why? I mean if the signal is distorted what will happen to the information which was in the ...
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So the power amplifier takes the AC input signal and amplifies it, so we get the AC output signal with a larger power than that of the input signal. And the energy required to amplify the signal comes ...
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The datasheet of the Qorvo microwave amplifier is here. I have troubles with the following points: In p. 9, they give a schematic of the way to mount the amplifier (I believe). But at the end of the ...
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I just did a simulation in Multisim of a class-A power amplifier, but the phase graph of the AC sweep (AC analysis) is not what I expected. With the reference circuit diagram, I simulated the circuit ...
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So we were asked to create an audio amplifier simulation in LTSpice. We decided that the total gain of the circuit should be around 600, having four stages in total: differential amplifier, CE ...
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I'm trying to design an audio amplifier. The preamp stage is a voltage divider CE, while the power stage is a Darlington Class A: My goal is to amplify a \$48.7\ \mathrm{mV},\ 1.07\ \mathrm{mA}\$ (...
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