An amplifier can be used to adapt the range of the signal to a requirement, to make it more robust for transmission, or to satisfy interface requirement (like input/output impedance)

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1answer
33 views

Instrumentation amplifier for load cells

In the most part of tutorials I see they use INA125 as the instrumentation amplifier for load cells. Is it ok to use another cheaper amplifier as the AD8237? Or is there a specification or ...
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3answers
75 views

High-Gain Common Emitter Circuit

I am trying to design a high-gain common emitter circuit. I know that I need to use a bypass capacitor with emitter resistor to increase the gain. My problem is the formula A = Rc / re makes things ...
0
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0answers
55 views

Is my electrolytic useable?

I have a +35 gnd -35 DC power supply for a power AF amp. I accidentally put one of the 10,000µF electrolytic caps backwards, and heard boiling and stopped it. I then thought I for sure fried it, ...
-9
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0answers
46 views

Is there any technology? [on hold]

Is there any technology to capture aura of the body? What is the mechanism in that? That aura means the light or radiation which is give out by the body for certain feelings like anger calm???
-1
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1answer
101 views

Simple, Cheap, and Poor Quality Audio Amp [on hold]

So I am attempting to build/design a audio amp. Basically around a 1 watt amp for a walkie-talkie. I'm planning to run it off a 9V battery. When thinking about a power amp several ideas came to mind. ...
0
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1answer
32 views

Calculating capacitance required for a pulse duration of time T using a class AB amplifier

Firstly I apologise if this question is similar to another one I asked a while ago. But, as you will see, this is question is slightly different. I have an amplifier which is a common emitter driving ...
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0answers
25 views

Simulating TI tlv4120 amplifier using spice

I have a circuit previously designed by an engineer. Some parts of the circuit have been changed around time and the engineer is not sure how the circuit works exactly. Now it's my job to understand ...
-1
votes
1answer
39 views

What is the difference between Rf Gain Blocks & IF Gain Blocks?

As advertised on websites of large manufacturers like Analog Devices And Texas Instruments I am aware of the difference between an IF stage and an RF stage, however, I was curious if there was any ...
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0answers
25 views

Microstrip lines- 50 ohm line for designing filter at 3.6 GHz [duplicate]

I have a question regarding microstrip lines... why do we use 50 ohm line as a standard?? please answer and attach necessary links. Thanks
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2answers
23 views

NMOS CS Amplifier PSpice Simulation Question

I have a rather peculiar question. I am attempting to recreate the circuit below (from one of my labs) of a Common-Source Amplifier design with a bypassed Source Resistance in PSpice. It has the ...
-1
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0answers
42 views

Voice amplification using BJT Amplifier and gaming headset

is there a way to hook up a gaming headset (e.g xbox) to a BJT amplifier so you can speak into the mic and hear your voice amplified in the headphones? I'm googling for an answer ...
0
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1answer
66 views

Circuit to provide 0-5 V output proportional to 0-30 A from C.T?

I want to design a circuit to protect oveload current of 30A.I have a controller board(PLC) which accepts the voltage range of 0-5 as an input and C.T with 1:7000 turns which can maesure 0.5 -60 ...
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2answers
98 views

What exactly does Watts and dB signify? [closed]

Now this is confusing. At some point i read that higher watts does not neccesarily signify high volume sound. An amp rated at 100w and other rated at 50w dows not mean the former is 2 times louder. ...
0
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1answer
132 views

Biasing a Non-inverting Amplifier

A signal that swings between -1V and +1V must be amplified with a gain of 2 using MCP602 and then biased by +2.5V, so it eventually swings between 0.5V and 4.5V. The amplifier only connected to 5V, ...
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votes
1answer
35 views

Identify part number of a surface mount device

I have a commercial data logger to gather data from a heat flux sensor. The sensor puts out a signal in the microvolt-range. This signal is amplified before it gets logged. I think that I've located ...
-1
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1answer
80 views

Charge Amplifier response and frequency response

I am getting ready for my final and have completed everything on my study guide except for two questions I cannot figure out. Here is the first question.. I have gone through all my lectures and ...
0
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0answers
39 views

Circuit to fix the amplitude of the sine wave

Does anyone have any idea on how to stabilize the various input amplitude of the sine wave for example 1.3V,0.8V to 1V of frequencies between 0 to 10Mhz? I known that a variable gain amplifier can ...
0
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3answers
61 views

Common emitter amplifier

Common emitter amplifier gives an amplified inverted output. So if I fed the inverted output to a speaker, would it sound fine ? If not, how do I get an amplified but non inverted output from a common ...
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0answers
82 views

RF amplifier, why cascade two amp doesn't work?

I am currently working on a amplifier circuit on 8Mhz signal (around -40dbm). The amplifier is based on a IC chip (lm7171 bin). The problem is, the amplifier works perfectly for individually ...
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1answer
67 views

How to interpret this data sheet?

I'm really confused understanding the following device manual:https://www.endevco.com/product/prodpdf/136.pdf I don't understand most of what they write. Any one has some idea about these terminology? ...
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2answers
46 views

Amplifier circuit for different frequency

I have construct the amplifier circuit by using LT1227 for gain=15. suppose for the input waveform should be amplified to 15 xVin for 0 to 5MHz, but why the output amplitude for higher frequency ...
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2answers
59 views

Amplify µC output from 5V to 12V for external IC that needs 12V to control without inverting

Does the following circuit boost the power of an arduino output (Arduino Mega 2560) from the 5V of the Pin to the 12V that I need to control a Wireless Transmitter Module without Inverting it? Can I ...
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2answers
68 views

Sensing weight with strain gauge, InAmp, ADC & Pi

I have an SEN-10245 sensor for weighing objects (essentially a strain gauge). The goal is to capture data with a Raspberry Pi, so the signal from the weight sensor needs to be amplified and then ran ...
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1answer
73 views

Offset of an amplifier

What exactly is offset of the amplifier? How do I measure it? In my measure lecture, lecturer told me to measure the same voltage in right polarity and opposite polarity. It should be enough to ...
1
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1answer
43 views

Line out bias on sound card output

I recently bought an USB sound card to do some measurements/experiments with. What I want to do first is to build a simple amplifier for the headphone output. Therefore I took the sound card apart ...
0
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0answers
54 views

Why does this voltage error amplifier output always reach its saturation voltage?

Why does the voltage output of both amplifier (Vm1 and Vm2 as shown in picture) always reach its saturation voltage?
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2answers
64 views

Determining correct requirements of Instrumentation Amp in measuring large current shunt

I'm trying to plan out a project of measuring large currents from my car battery through a shunt, and specifically I need help with the INA. I bought this Deltec 250 amp shunt from eBay, that looks ...
2
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5answers
720 views

Amplification without transistors or tubes?

Are there any means or technologies that can be used to linearly (or close to linear) amplify an audio or LF RF electrical signal that do not require transistors or vacuum tube technologies? (Or ...
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votes
1answer
106 views

how do oscillations build up initially although the circuit has no external applied input? [closed]

In practical we got some king of oscillation even before given input power. We have built wien bridge oscillator like this one. . image from electronicdesign.com
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1answer
64 views

Discrete MOSFET Amplifier question: Trouble finding the Overdrive Voltage

I am working on an exercise problem (5.18) regarding Discrete MOSFET Amplifiers. I have taken pictures of the question material (Disregard the section under the question) and my latest attempt at a ...
0
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1answer
82 views

How to calculate maximum allowable signal swing at the collector?

How to calculate maximum allowable signal swing at the collector? How does change in beta value change the swing at both ends?
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3answers
53 views

Determining peak to peak voltage of an NE5532 using an 8 ohm speaker

In order to calculate the peak to peak voltage of a an op amp (in this case an NE5532) I need to simply multiply the short circuit current from the data sheet (38ma for this IC in typical operating ...
0
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1answer
77 views

Electret Mic signal amplification without DC offset

I'm working on a small audio project and I need a circuit that does the following: take a signal from an electret mic, rectify the signal, amplify it, and remove the DC offset. I have tried many ...
2
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0answers
92 views

Eliminate/reduce speaker pop when powering off amp [closed]

I'm repairing an old 1970's record player and one of the items on my list is to try and reduce the loud 'pop' noise when switching off the amp. I've done a little research and it seems there are a few ...
2
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1answer
54 views

What are class E amplifier RF choke guidelines?

I am designing a novel circuit that I beleive has not been constructed yet! No -- I'm just using an exotic switching device for a class E amplifier. My operating frequency is close to the 160 ham ...
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0answers
70 views

Trying to use INA2128 op-amp (or INA128, a similar model) in Proteus ISIS

I'm trying to simulate an EMG-signal amplifier that I got the schematic for from one of my seniors at my university. The signal strength varies from 3mV to 10mV, and the amplifier takes it up to 5V. ...
1
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2answers
118 views

Amplifying Small Signal With Solid State Relay

I am trying to control an electromagnet with a signal from a small microcontroller (a BeagleBone Black). Obviously, I need to amplify the signal. I have a lead from a power source that I want to pass ...
1
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1answer
125 views

opamp circuit for amplify up from 1.1V to 5 V

I am doing a DDS function generator with AD 9850 ,because of the charactericts of DAC converter http://www.analog.com/static/imported-files/data_sheets/AD9850.pdf, page 9 figure 5, the output of ...
4
votes
2answers
162 views

Audio from Arduino Due's analog outputs using LM386

Due's DACs provide 0-3.3v (actually less) and are rated at 3mA max. As far as I know, common speaker/headphone impedances range from 8Ω to a few hundreds, so driving these from the DACs will destroy ...
8
votes
1answer
142 views

Fully understanding LM386 datasheet minimum parts example

I'd like to fully understand the circuit marked as "Minimum Parts" at page 5 in LM386's datasheet: Is there any reason for 10k resistance at the input potentiometer or is it just an arbitrary ...
-2
votes
1answer
42 views

Sony TA-SP55 only ampli [closed]

I've got a Sony TA-SP55.I've saved only the amp, and I'm sorry to throw it away: does anyone know how I can "implanting" a jack and use it as a simple jack -> amp -> speakers? Reading the block ...
0
votes
2answers
166 views

Explanation of transistor amplifying action

I am reading "Electronic Devices and Circuit Theory" by Louis Nashelsky, Robert L. Boylestad. I am not able to grasp article 3.5: Transistor Amplifying Action. I've mention some particular points on ...
3
votes
2answers
81 views

Using multiple shunt amplifiers with a single shunt resistor

I have a 10mohm 1% resistor that I want to use to measure current. Since I need multiple ranges I want to use multiple amplifiers with different gains (INA212-Q1, INA213A-Q1, INA214-Q1) with the ...
2
votes
1answer
120 views

Why are 2.4 GHz amplifiers costly while RF amplifier IC's are cheap? [closed]

A lot of 2.4 GHz amplifiers on eBay are sold for $30-50, but the amplifying chips are available on Digikey < $1. Why? The PCB's are two layers and other SMD components are quite cheap too, then why ...
1
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2answers
61 views

Speaker level to line level

I want to reduce my apmlifier output to line-level. I found this tutorial which is compatible with 50Watts output power. There is also mentioned what to do if amplifier is more powerful than that. So ...
4
votes
2answers
104 views

What's the rationale behind this choice of resistor for a BJT common collector amplifer?

As part of a design lab, we're using a common collector amplifier, and the instructor's choice for the emitter resistor makes no sense to me. The power rail is at V+=15 volts, and the load is 8 ...
0
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0answers
31 views

Amplifying an antenna signal before rectifying it

I do not have any germanium diodes for a radio project I am working on. Due to this, I must amplify the antenna signal before I rectify the signal, as I will be using a silicon diode. How do you ...
0
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0answers
36 views

Grounding a monopole antenna in an amplifying circuit

I have an antenna that is a spool of wire with one end stripped. I have a configuration like this. When I test the light green and cyan wires on this diagram with a multimeter, I do get a positive ...
0
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1answer
66 views

Need a precision single supply log amplifier (voltage to current)

In the synthesizer world there is a standard called "1V/octave" which basically refers to a linear input voltage corresponding to a logarithmic change in frequency (e.g. 1V = 100Hz, 2V = 200Hz, 3V = ...
2
votes
1answer
184 views

Electret microphone amplifer for general aviation

I'm attempting to create a converter box that allows the use of a standard electret mic and earphones as a headset for general aviation. The headset is relatively straight forward, just use an audio ...