Simply the ratio of output signal to input signal, this dimensionless quantity is a measure of the amplification of a signal which may be represented by voltage, current of may even have a digital representation. A very general concept sometimes used to describe attenuation (when gain

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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 ...
-1
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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 ...
0
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1answer
57 views

Is a subwoofers RMS/peak wattage rating subject to the enclosure type?

The RMS and peak wattage rating of a subwoofer (or any speaker) show afaik how much power it can safely handle without damaging it. But is this true for both sealed and ported enclosures? (assuming ...
-4
votes
3answers
95 views

LM358 output voltage non-zero even though input is zero [closed]

I tried this experiment with LM358 and LM741. I used the circuit mentioned from this question: I have not connected any input source. But I am getting an output of 7.5V. I used R1 as 130 Ohm and R2 ...
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 ...
1
vote
1answer
71 views

How are the gain and corner frequencies calculated for this speech bandpass filter?

This speech bandpass filter circuit appears in the TI OPA344 datasheet. It says "G = 100" and passband is 300 Hz to 3 kHz. How is the gain and corner frequencies calculated from the various ...
7
votes
4answers
450 views

Choosing resistor values for non-inverting amplifier and why?

The gain here is A = -Rf/Rin. However, lets say I want a gain of 10 V/V. Which resistor value would you choose and why? I know that you could have infinite number of combinations for these ...
1
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1answer
111 views

Gain of this schematic

I am interested in the following compressor, which I reverse-engineered from a pcb (there might be some mistakes, but I don't think so) (open the schematic in a separate window to see the small ...
1
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2answers
60 views

How important is the temperature stability for gain - setting resistors?

When two resistors are used to set a gain of an opamp, do I need to care about their temperature stability, provided resistors are from the same series, same manufacturer? Let's say my circuit will ...
3
votes
2answers
164 views

Problem with Wien's Bridge basic working and simulation in multisim

I am very new to the concept of Wien's bridge and am trying to make a basic circuit of it but didnt get the expected output (noise only).Tried to simulate on Multisim but got the same output.I have ...
4
votes
2answers
88 views

How to know the gain of my opAmp

I'm having a LM358 opAmp with the following Schematic, as I'm not from Electrical background, can you please help me determining it's gain. I just want to find out it's gain. simulate this ...
3
votes
2answers
84 views

How is the gain/phase vs frequency measured for opamps?

Opamp manufacturers post graphs like these in datasheets: How is the data for this graph measured? Is it calculated using the mathematical model of an opamp?
1
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0answers
46 views

Are RF gain blocks suitable for making VHF oscillators? [closed]

E.g., can I use them in circuits as active filters with positive feedback to generate VHF? Can't find models to simulate them. Is it possible to obtain them somewhere? The model I'm particularly ...
2
votes
2answers
209 views

Gain in Common Emitter Amplifier

I need to design an amplifier having a Vin=150mVp, 1khz; Vcc=3V that can run an 8ohms, 0.25 watts speaker, with a gain for about 7 without noticeable distortion. Below is my designed voltage divider ...
2
votes
2answers
146 views

How does the fuzz face guitar pedal actually output any gain to the input signal?

I'm referring this this circuit right here: I do not understand why the circuit would be designed like this and why the output wouldn't be drawn from the collector of Q2. I have 2 questions, which ...
2
votes
2answers
182 views

Op Amp gain less than 1?

How would I design an op amp with a gain of less than 1? Is this even possible? Also would it matter if I used a non inverting or an inverting op amp? I've designed a non-inverting op amp with a ...
0
votes
0answers
31 views

Calculating gain, input and output resistances of a current amplifier circuit

In the circuit below, I want to calculate the gain, $$\frac{I_{out}}{I_{in}}$$ as well as the input and output resistances. I wrote the node equations for the two nodes: $$V_x ...
1
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2answers
119 views

Advice for my Voltage controlled Amplifier

In class we are designing a VCA together as part of a bigger circuit. The aim is that we have an input of speech and an input of music and when we speak the the music reduces in volume. The speech ...
1
vote
1answer
75 views

(Ideal) Amplifier networks/nullors - determining the gain

I am having trouble understanding how the different amplifier networks actually do "their magic". In these networks a nullor is a unite that has always 0 voltage over the input and no current through ...
0
votes
1answer
46 views

How to find the gain of Motorola operational amplifier?

How to find the Gain in dB for Motorola operational amplifier MC33282P (for T=25°C). The manual has only abstract figures.
2
votes
1answer
155 views

Distortion in the output of amplifier circuit using uA741 + schematics and graphs

I'm simulating an audio amplifier with uA741 in pspice (student version). The input signal is a 0.1v (100mv) sine wave with frequency between 1kHz and 10kHz. The theoretical gain is 33 but in ...
0
votes
1answer
94 views

Question about AD834 + AD811 as voltage controlled amplifier

According to page 15 of AD811 datasheet , it can be used as a voltage controlled amplifier in conjunction with AD834 . In the schematic below, I am a bit confused about the configuration. If we ...
2
votes
1answer
149 views

Gain vs ADC performance vs ADC settling time

I have some basic doubts in ADC conversion. I am using AD7798 ADC. I am reading ADC values using AT90USB1287 micro controller using SPI communication. I am able to read ADC values perfectly but i have ...
1
vote
2answers
200 views

How to control the gain of FET/BJT/Op-Amp amplifier by input voltage range?

Assume I have an input voltage ranging from 5-10 MHz and want to amplify it. The case is pretty simple as any device as FET,BJT or high frequency op-amp can do the amplification well but I have a ...
1
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0answers
113 views

Differential amplifier problem

I really can't determine what my professor meant by this. He wanted me to calculate parameters of BJT differential amplifier that will have -100 amplification for signals difference and -1 for their ...
0
votes
3answers
326 views

How to design a unity gain with LM358 op amp?

I am trying to get a unity gain out of an LM358 to increase the current of an AC sine wave input from 5mA to something slightly higher. I thought I had it hooked up correctly for unity gain, but most ...
2
votes
2answers
411 views

LM386 with Gain of 40

I am trying to build one of the example circuits in the LM386 datasheet (any of the first 3) but with a gain of 40 rather than 20, 50 or 200. I understand that the gain is controlled by the impedance ...
2
votes
2answers
952 views

Gain of common-emitter BJT amplifier with bypass capacitor

I have this common-emitter BJT amplifier: simulate this circuit – Schematic created using CircuitLab The text book says that with a bypass capacitor, the gain is -Rc/re, where Rc is ...
2
votes
3answers
371 views

Resistive sensor reading ADC

I have to make an ADC conversion with an ATXmega MCU, in an air quality application. The input is a voltage divider between a voltage reference. The sensing resistor vary in relation to a gas ...
3
votes
1answer
267 views

How can I modify this circuit for a higher gain?

Here is an image of an amplifier circuit. How can I modify this for a 10-50 times more gain. I put a wire from pin 1 to 8, but I didn't get enough gain.
6
votes
4answers
416 views

Confusion between Voltage gain & Voltage gain in decibels (dB)

The definition of the Voltage Gain is \$ V_{out} \over V_{in} \$. However, I read some articles about the gain in decibels, and I have a confusion now. Here is an article about it: ...
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votes
1answer
178 views

what is the gain of this amplifier at resonance frequency?

I want to analyze this circuit but I do not know how to compute its gain at the resonance frequency. In lab its gain at resonance frequency (910kHz) was 54.
4
votes
1answer
109 views

Least noisy pre-amplifier design

I am building a frequency generator circuit and need some advice. I am using the AD9833 DDS generator (programmed from a PIC16F876) to generate frequencies and I wish to be able to adjust the gain. ...
1
vote
2answers
216 views

Does gain affect stability of a Transfer Function?

I have a control system that we are working on with a forward transfer function of:- \$ \dfrac{K(2s+3)}{s^2(s^4+2s^3+4s^2+2s+7)}\$ So I've set up the routh table for this, I've found there are 2 ...
4
votes
3answers
167 views

For what reason(s) is it not desirable to have the amplifier gain depend on the β of the transistor.

For what reason(s) is it not desirable to have the amplifier gain depend on the β of the transistor.
1
vote
1answer
314 views

Gain on a Differential Amplifier

For the past hour, I've been trying to calculate the gain of a differential amplifier in the following form: \$ \frac{V_{out}}{V_{in}} = \$ some function of resistors I went to this site and tried to ...
2
votes
3answers
2k views

How do I calculate the gain of an op-amp summing amplifier?

So if I have a summing amplifier circuit like the one below: I know the Vin1, Vin2, and Vout value and the circuit is designed such that Vout = -(Vin1+2Vin2) but how do I calculate the gain? I know ...
3
votes
1answer
290 views

Small high gain directional antenna

I want to build a high gain directional antenna for the 915MHz frequency band. I have been looking into waveguide and yagi antennas, which seems to fulfill my gain a directional requirements but ...
2
votes
1answer
56 views

Darlington (TIP110) gain value

I'm referencing this Fairchild semiconductor datasheet on the TIP112. (I'm actually working with a TIP110) and trying to evaluate the gain. In the specs grid on the second page, the sheet states -> ...
4
votes
2answers
1k views

adding a yagi antenna to a bluetooth dongle

I want to set up a Bluetooth link between devices that are over 2000 feet apart. Yagi antennas for 2.4GHz that can connect to routers are available. A cheap Bluetooth dongle that can be easily taken ...
2
votes
2answers
143 views

What's the use-case for gain selection on a DAC?

I'm looking at the datasheet for an MCP4921 12-bit DAC (PDF), which describes the following feature: Selectable Unity or 2x Gain Output - The user can configure the full-scale range of the device ...
9
votes
1answer
816 views

Why is my instrumentation amplifier's gain non-linear?

I am using an AD8226 instrumentation amplifier as the pre-amp in a circuit which uses a micro fuel cell oxygen sensor to measure oxygen content in a gas stream. The pre-amp is configured in single ...
1
vote
4answers
982 views

What is “gain” a measurement of in electronics?

I'm familiar with the term "gain" used in sound and music, but I'm having difficulty finding the definition in electronics. I'm seeing the term low gain and high gain being used in the description of ...
1
vote
2answers
1k views

What potentiometer should I choose?

I want to create a sound amplifier with the LM386 and I need a potentiometer. I don't have a clue what I'm doing (:P) but I've printed out the datasheet (for the LM386) and had a look at it. So I ...
2
votes
0answers
80 views

Digital automatic gain control? [duplicate]

Possible Duplicate: Calculating dBFs from RSSI My RF chip doesn't have any RSSI output, just ADC I and Q. I was wondering is it possible to determine RSSI from ADC's I and Q values and ...
2
votes
1answer
219 views

What does it mean for amplifiers to be stable only down to N gain, where N > unity?

This is related to What's special about "unity-gain stable"? which is about unity gain stability. But what exactly does it mean if some op-amp is said to be only stable to, say, gain ...
0
votes
1answer
281 views

Creating a programmable gain amplifier with a digital pot and an op amp

I wanted to create a PGA using a single supply op amp and digital pot. I hooked up my circuit like below, but my signal is getting attenuated with Rwb = 200 ohm and Rf = 1k. Are there any problems ...
1
vote
4answers
320 views

Characterizing raw op amp gain

I thought as a first exercise in op amps, even before setting up a feedback circuit, I would determine the gain of the raw op amp. I tried with an LM324 and an LM358 which should be essentially the ...
2
votes
1answer
387 views

Amplifying Signal From Electret Microphone

My project requires me to use an electret microphone and I am having a lot of trouble getting any decent-sized signal out of it. I currently have it configured with a 100Kohm pullup resistor and a ...
3
votes
3answers
185 views

Ground/short circuit confusion

I am reading the book Electronic Principles by Malvino and I found the circuit shown below. It asks to find the A(gain) when the switch is in position 1 and in position 2. I am not sure about this ...