Amplifier Definition and 560 Threads

Alright, I've been stuck on this problem for my electronics class for far too long. " Design a CE amplifier with a gain of 10 using a 2n3906 transistor and a 20 V power supply. Calculate the required resistor and capacitor values for the circuit, assuming a minimum frequency of 10 Hz." It...

Hi guys, I need to build a REALLY simple amp for a friend. I only want to use a resistor and a transistor plus the normal stuff(battery and speaker). Please help. Thanks in advance, Circuit Man

Hello guys, Introduction: I would like to get some input about some kind of temperature amplifier. What I have, is: - an electrical heater (basically a resistor that is heating a square piece (20x20 mm, 50-100 W) of copper). It's insulated on 5 sides of the copper cube. Only one side is...

Hi, I'm designing an amplifier and need help with some basic ideas (Filtering is already taken care of). My main question is bolded. The output is an audio signal, and it drives an 8 ohm speaker. The power is 1 watt through this speaker. The input signal is coming from another amplifier...

Hi, Could someone please help me with something i need to know to complete my college course? The question says: 'Show with the aid of a circuit diagram and input/output waveforms how and NPN transistor can be used as a small signal amplifier, when operating in a common emitter...

Today I did a lab on BJT amplifier frequency response. I got the fc1 and fc2,BW and F0 center frequency. The band pass turned out to be asymmetrical. What i want to know is this. Input V=40mVpp output V=2Vpp cut off V=1.41Vpp When I turned up the frequency to 2fc2, i got about...

hi... can anyone help with the problem i attached thanks in advance... I think a good start would be to convert the current source into a voltage source

Hello Guys, I really need some help with this one. I'm still working on the circuit design for this AD9959 programmable pulse generator and I found (from reading the datasheet) that the output from the DAC uses differential current output and not voltage output (something like 0.5V @ 20 mA...

Homework Statement We have a filtered amplifier (diagram is attached). We do not know Cf or Rf. We know that: 1 volt input at 5 Hz = 9.25 volt output 1 volt input at 200 Hz = 6.77 volt output 1 volt input at 500 Hz = 3.66 volt output Homework Equations The transfer function for...

Is there a limit to the possible amplification of Short Wave radio transmission and/or reception? A friend of mine wants to build a massive amplifier / transmitter. If a limit does exist what is the physical law used to explain it?

I've got a sony home theater system and my dvd player has gone for repairs. I've got a party to throw by tomorrow and I need some help. I want to connect my IPod to the HT system. The only problem is, it takes those individual inputs for the left and right audio signals (red and white wires)...

http://www.vcaa.vic.edu.au/vce/studies/physics/pastexams/physicspilot12004.pdf Page 13. AC signal on CRO. Answer is B. How the heck do they do that? Relevant information is on page before. Love peoples explanations but please try to keep it simple. Sorry if i seem direct. I don't...

My year 12 exams are in 1 week exactly and I'm worried about a question (from last year's exam) that my teacher can't even answer. Each year they tend to repeat the difficult questions, and this was one of those. I'll just give a summary of the question, and maybe you'll be able to answer my...

HIGH o/p dual power amplifier (! HELP !) i have attached the cct diagram i found about this IC BA5417 it is a power amplifier as one can see pins 11 & 12 are input but how exactly does on give this input i plan to give input from my discman so there will be one ground wire and the two...

Hello every body I am new members in here I hope you will eccept me as a good member I study electronic in college... I have got this task and I can't answer it The reason why because the tutor didn't explain to us how it's work ... he wan't us to answer it using the...

So here is the deal: I am driving a polarization rotator to attenuate light. The polarization rotator takes a 3-5kHz AC signal, they suggest a square wave. I have a frequency generator chip that can generate a 2Vpp signal, but I want something a signal of 0Vpp-10Vpp (though most of the...

Hello All, I'm working on a three-channel tube amplifier for some experiments I'm doing (and later on, my keyboard :biggrin: ) and I was wondering if the nice people here could give me some tips for the circuit construction. I've already ordered a bunch of 6au6 tubes (because they were 50...

Hi, Suppose I have an amplifier with feedback, how would I measure the input and output resistances (using instruments)? If the input of the amplifier is a voltage source, the input resistance would simply be V(signal) / I(signal). Now if the output of the amplifier is a current, would I...

How does a small change in base current result in a large change in collector current in a BJT? Please explain in terms of movement of electrons (in NPN). Most textbooks I have referred say that the reason is low resistance of emitter-base and high resistance of collecter-base. However i cannot...

Homework Statement 1) Consider an inverting operational amplifier as shown in figure. Suppose R1= 1000 ohm & Rf = 10^6 ohm. It is said that the input impedance=R1=1000 ohm and the Output impedance= 0. 2) Consider a non inverting operational amplifier as shown in figure. Suppose R1= 3500...

I know the output voltage for a difference amp is (R2/R1)(V2-V1) but how do you find the output voltage when you connect the circuit attached to the difference amp where V1 and V2 are the input voltages to the difference amp?

Homework Statement The problem states that we should draw the Vout curve of an amplifier circuit. Homework Equations We have a sinusoidal sign with amplitude=1v and frequency=0.5 v(t)=A*sin(2pi*f*t) f=1/T T=2s The Attempt at a Solution Since we have negative feedback...

Homework Statement I have some problems determining the tension output value for this circuit and this confusion comes from the presence of positive feedback and an alternate current.Since I'm used to negative feedback circuits and direct current it confuses me a bit,so any help is deeply...

Homework Statement One of the problems question is: Determine the analitical expression that relates the resistive value of the NTC thermistor with the tension Vt.I've come to an expression but I'm not sure if it's correct.Also, the other question of the problem is: Make an analitic...

I need a DC power supply for a project I'm working on. I have a Leach amplifier with a monster power supply and heat sinks able to handle it clipping at ~500W/channel. It's just sitting on my floor. I also have a 2 16bit 1MHz DACs and 2 16bit 200KHz ADCs attached to a National Instruments...

I'm trying to simulate this ciruit on microsim schematics: http://i75.photobucket.com/albums/i281/esmeco/amplifier.jpg This's what I've got so far: http://i75.photobucket.com/albums/i281/esmeco/Microsimcircuit.jpg What I want to see is the final graph with the values of V0,V1,V2.V1...

Just a simple question about the Op-amp. For inverting amplifer circuit, if I connect the positive terminal of the power supply to the Vcc, and the nevgative terminal to the Vee. What will happen to out put signal related to the in-put signal? Thanks.

I've assembled an amplifier circuit which is composed by a V1 and V2 input and Vo output.V1 is 1V and V2 varies from -5v to +7v with increments of 0.5v. The formula for Vo is: Vo=(1+R2/R1)x(R4/(R3+R4)xV2) - (R2/R1)xV1 My questions are:why does the equation |Vo experimental - Vo theory|...

Hello! I'm trying to determine Vout on this amplifier and I'm having some problems with the equations,because I'm not sure if they're correct! This's the link to the amplifier: http://i75.photobucket.com/albums/i281/esmeco/Amplifier-1.jpg The equations I've got so far are these: IB=0...

Hi, does anyone know what are the 4 different cases in a common mode differential amplifier? thanks a lot for all of your help. thanks, peace

Hello, I have a few questions about creating a multiple output stereo computer speaker amplifier. I am using a standard audio output from the computer. Basically what I want is to have: 1. Both quarter inch and eighth inch stereo jack input, but only one at a time will be used. I...

Hi, I'm new here. can somebody put here an a schematic of Class AB, D,G or T. I need an audio amplifier that work with bjt and mosfet simultaneously, i think that kind of amplifier is class g, but I'm not sure,for example i saw an 5000w amplifier with 2sc5200 and his pnp pair working with...

Right now we have a projector and it is about 75 feet away. The remote, well, works pretty terribly to say the least. What I would like to do is build an IR amplifier to boost the signal so that the projector can pick it up much easier. What I plan to do is use some sort of buffer/driver IC...

Hey, I need to design an amplifier using either BJTs or MOSFETS (or both) that meets the following requirements: Overall voltage gain: 800 Input impedance : 200Kohms Output impedance: 200 ohms Frequency band width: 10MHZ Can anyone help me with what kind of arrangement of amps can...

I'm trying to model a circuit. Part of this circuit is a guitar amplifier. I don't know what kind of circuitry is inside the guitar amp, it manufactures often list the input impedance in the product specifications. When they say input impedance, do they mean the impedance between the...

I'm really confused between saturation and amplifier. When will the transistor work in saturation mode and in amplifying mode? Resistors are the matters. We chose the resistors so that the transistor will work in saturation or amplifying. How can we chose?

Hello... How are you all... I have this research about Electrogastogram Amplifiers, If anyone has any idea what this amplifier is about please reply. Thanks for your time... SCHNiTZER :rolleyes:

A radioactive material emits 2 gamma rays with 2 energies 50 keV and 200 keV with equal probabilities the detector system has a quantum efficiency of 100% and 50% respectively at these 2 energies and the pulse heights are 1.0 mV and 4.0mV respectively. The pulses are input into a 512 channel, 10...

:mad: A radioactive material emits 2 gamma rays with 2 energies 50 keV and 200 keV with equal probabilities the detector system has a quantum efficiency of 100% and 50% respectively at these 2 energies and the pulse heights are 1.0 mV and 4.0mV respectively. The pulses are input into a 512...

i don't have the basic of analog, but i tried to look for in the books. unfortunately, the books are using voltage divider biasing instead of feedback biasing. i have a circuit like this: http://www.mrnerdy.com/forum_img/BJTampfeedbackbiase.jpg would anyone tell me the flow of the current in...

I want to inform you that our course about operational amplifier at university has such of the following topics: adder amplifier(inverting and non inverting)- integrator-diffrentiator-comparator- schmitt trigger-rectangular waveform generator-triangular waveform generator...and some active...

Is there a book or website that explains throughly how to use a Lock In Amplifier? I have never used one before and am using it in a Johnson Noise experiment with the "Art of Experimental Physics by Preston and Dietz" acting as the lab manual.

I have attached an image of an inverting circuit. If I set R1 = 10 k ohms and R2 = 100 k ohms, I need to verify if this circuit works or not. Therefore, would the voltage between points A and B be equal to 0.1 V since B is connected to ground? The voltage input is 0.1 volts. Thank you

I have the amplifier in the attached file and I measured Vout without any input and got a really big number. Should it be really big or really small? I mean theoretically, what should it be equal to because I'm not sure that my answer makes any sense. Thanks!

Hi Guys, I'm trying to amplify a millivolt signal from an electrode that has a high input resistance (~ 200 MOhm). To avoid losses over the series resistance I'm using a high input impedance Op Amp TL071CP as a voltage follower. The problem I'm having though is that for some reason when the...

hi there, i have two questions concerning operational amplifier which i can't figure out. i have tried them for hours, and finally get on a bit, yet i am not sure whether i have the answer right. :( 1a. What is the value of the feedback resistance in figure 1? My ans: V_out/ V_in = 1+...

Hi can anyone explain to me how you can drive a transistor to function as a switch?what calculations i have to make in order to decide the type of transistor that i need and the kind of resistors that i need. also i have a voltage of maximum 80 mv.i want to enlarge it in order to drive the...

Just out of interest guys have I got this right? Function of certain components of a common source amplifier: Capacitors at input and output: They are coupling capacitors and simply block the DC voltage, but allow the AC voltage through. Gate Resistance: Is the purpose of this to limit...

Hi Guys! well! i have designed a mosfet amplifier. This amplifier uses only MOSFET in its operation along with an input signal and capactors and resistors and VDD. I want to ask u one thing. The amplifier which i have designed takes 0.1V of AC signal as an input and provides a gain of...

I am given an ideal OP-AMP like this (R-resistor, Cap-capacitor): ____+Cap-_ | | ___R____|__|\______|_____ + | -|/ + | V in | V out - | | | |_________|______________ - and V in is...