Amp Definition and 377 Threads

Hi I am trying to create a circuit which i can use as a voltage controlled switch. I have 2 voltage inputs, ** A constant 3V source V1, ** A source which charges up to 3.5V and then slowly discharges V2. I would like to amalgamate both sources so as when V2 discharges...

Hello, I'm having problem understanding the output of the integrating op amp. https://www.dropbox.com/s/djpg0uhi465ot86/download2.png https://www.dropbox.com/s/djpg0uhi465ot86/download2.png https://www.dropbox.com/s/p9bp9tlyykhjtvf/download.png...

I’m in the process of writing a lab report after testing a cascaded common-emitter amp. The second transistor input is the collector output (collector to base) which I understand to be an emitter follower? I have used PSPICE to measure the gain when a 20mV signal is applied and I have...

Homework Statement http://imageshack.us/a/img27/7043/homeworktest2prob5.jpg Find the load current IL (in microamperes) in the circuit.Homework Equations V = IR KCL, KVL, voltage division, current division,Op-Amp Output V = (Gain)(V+ - V-)(Gain) = -Rf / Rin The Attempt at a Solution I'm not...

Homework Equations I think I figured out the 1st question. The result I got is Vout=2*Vin+2V. Which means twice as big wave as the Vin and shifted with 2V. Is this enough or I have to write equations like 2nd -> Vout = 2*Vin+2V? or 2) 2kV/s is the same as 2V/ms, or 20V in 10ms 3) Vout...

Homework Statement Design a circuit based on the noninverting op-amp configuration that functions as a 1mA ac current source. Homework Equations Gain = Vout/Vin = 1 + R2/R1 The Attempt at a Solution I really don't know how to start.

I have a circuit (attached) that is providing too much voltage into my FPGA. I attached the circuit. The output of the transimpedance amp is sending 4.2V to my FPGA which only needs 3V. I h ave reason to believe that the 4.2V input into the FPGA is causing some weird anomalies to occur while...

I understand how to apply op amps, but one thing about op amps had bugged me for some time. I want to know what about an op amp in negative feedback forces both the posotive and negative inputs to be equal. And could your explanation be for both an inverting and non inverting op amp. Thanks! :)

I need to design a "front end" that will connect a power sensing diode to some other measurement instrumentation. The gain should be abour x2500, the input signal will be of the order of 1mV I need to be able to vary the input impedance from 100 ohms to a few kOhm by changing components...

Hi all, What is the configuration of the op amp in the attached file? The resistors is confusing me. Can someone enlighten me? Thanks alot!

I have a few power supply's of different voltages, but for convenience a.t.m. can I use +9 and it's -5, it has a ground of course too

Hi :shy: I'm a new member here for a long time I'm looking for a help in my project Power Push-Pull Amp ( class AB ) :cry: Can anyone help me with circuit diagram in Multisim for class AB or anything :biggrin:

Homework Statement Suppose you are given an ideal op amp, an ideal voltage source with voltage Vs, 5 resistors with resistance R, and one variable resistor whose resistance can be adjusts continuously between .2R and R. Use these components to design a circuit, assuming ideal op-amp behavior...

I have a solar cell that is rated 3.6 amps .5 volts 1.8 watts when you take a ammeter it does put out 3.6 amps, but this is basically a dead short reading. What I want to know is these cells put out .5 volts using ohms law how much resistance is needed to have a voltage output of .3 volts so you...

I need to design a class D low power RF amp that I can control the RF output of without tampering with the input signal. I need about 200mW out @ 50 MHz but the input drive is a digital coded pulse train I can't tamper with in any way. I need class D for best efficiency and battery life. How...

Good day people. I am new here and discovered the forum while trying to answer this question. I have a large variety of brushless and stepper motors collected all for the purpose of putting together my CNC mill. The router will be 80 amp 5500KV Kevlar bandaged brushless motor capable of 100,000...

I have a temperature probe that I amplify with an OP amp and the circuit has to sit next to a video transmitter operating at 1280 MHz outputting ~ 800 mW of power. I can get the circuit about a meter from the transmitter if I absolutely have to but it is going to be in somewhat close...

Homework Statement I have to use the basic equivalent model of an op-amp to develop an expression for Vo from the given op-amp. I also have to simplify the expression by treating the given op-amp as an ideal op-amp. Homework Equations Vo=A(Vp-Vn) Vo=G*Vs The Attempt at a Solution...

Homework Statement Find V_{out} of this amplifier Homework Equations V_{out}=G_v(V_{in}+V_F)=G_v(V_{in}+B_vV_{out}) The Attempt at a Solution I have been stuck on this for a week. I really don't know where to start. Have read the chapter multiple times, tried to create it on...

Homework Statement I am designing a voltage divider common emitter amplifier given the following parameters Av= 40 dB +/- 1dB Zi> 1000 ohms Zout< 5000 ohms Stability factor = 5 Beta*re= 650 ohms Beta minimum = 35 Beta maximum = 300 Vcc = 20 volts Rload = 33 kilo-ohms Rsource =...

Hey guys, I'm designing a wireless cell phone charger that can be used inside a car for the senior design project. I'm feeding 12V DC into a colpitts oscillator which is fed into a B class power amplifier which will then be fed into the transmitting coil. Each one works great independently...

Homework Statement Find Vo as a function of Vg and the open-loop gain A. Attempt I'm not sure what open-loop gain means. I redrew the circuit so it made more sense to me, but I'm still not getting it. It seems that Vo is the voltage across both RL and the 4k resistor. The...

Homework Statement Assume the op amp is ideal. Design the circuit such that Vo = Va + 2Vb + 3Vc The Attempt at a Solution Not sure how to go about this one. I started with \frac{V_a}{R_a}+\frac{V_b}{15k}+\frac{V_c}{R_c} = 0 since the op amp is ideal, the sum of the currents going into the...

Homework Statement http://www.wifstrand.se/Albert/stuff/p6.5-9.png I'm stuck with finding v_o1 (voltage over the 10kohm resistor when all sources but the 3 V source, which I've labeled v_1, is set to zero); seems like it should be really simple but I'm missing an equation. Homework...

Problem: In a MOS cascade amplifier, the cascade transistor is required to raise the output resistance by a factor of 40. If the transistor is operated at VOV = 0.2 V, what must its VA be? If the process technology specifies V'A = 5 V/μm, what channel length must the transistor have? Given...

Homework Statement Calculate Vout if a) I=1mA, R1=2.2kΩ, and R2=1kΩ; b) I=2A, R1=1.1Ω, and R2=8.5Ω. c) For each case, state whether the circuit is wired as a non-inverting or an inverting amplifier. NOTE: I is set to 1mA in the circuit below. Homework Equations Req=(R1*R2)/(R1+R2) V=IR...

Coverting Amp to pull force?? I am trying to figure out a way to covert amps to pull force(lbs). I have a known amp that I would like to find out the pull force in lbs. I have 2.8 amp @ 120v and would like to know the pull force that is needed to turn this type of amperage.

Hi ! I want to amplify the output of my hall effect current transducer ( CSLA2CD ). The output of my hall effect sensor is 15.6mVac. And I used a dual rail op - amp to amplify this small ac voltage which the gain is 101 ( as shown in the schematic below ). I tried to simulate using multisim...

I need to know how does it operate. The textbook that we got doesn't state clearly. Can anyone guide me on how a class AB power amp work stage by stage ? Thanks in advance.

I'm still learning about this, but it seems that an RC circuit performs the same function as an op amp integrator (http://www.electronics-tutorials.ws/opamp/opamp_6.html). In other words, they both can be used as integrators/low pass filters. If this is true, why would anyone bother with an...

I am currently trying to measure an 80pF capacitor using 2 voltage follower op amps. I have them both powered by a set of 2 1.25V rechargable batteries. They are op amp type LMP7721 link: http://www.ti.com/product/lmp7721 . Each op amp is configured such that the voltage out terminal [end...

I have a US Navy "Plate and Filament Transformer" Manufactured by Hudson American Corporation. This monster weighs 14.5lbs, and is in a sealed steel casing. My output trans weighs 15.5lb as well. There are 16 unlabeled terminals, and I'm working to identify those. Suggestions on how to go...

Is it possible to power the op amp in this diagram in this manner if it requires +18V and -18V? This doesn't seem valid to me, but I'm not sure why it's not exactly. Thanks

Hi, I'm trying to find the amp of a circuit. Okay I know a circuit has a resistivity, So for example if my circuit is made out of cooper which has a resistivity of 1.68 * 10 negative power of 8 and a voltage of 9 volts.So do I just use ohms law Volt / Resistant = Amp?

Homework Statement (See attached figure) I need to find V0 in terms of R1, R2, R3 and C.Homework Equations V0 = -RC (dVs/dt) for a differentiatorThe Attempt at a Solution I understand I have to apply KCL at the node between C and R1, and I've also determined that R1 and R2 are in series (not...

please help me i need a replacement for lm1013 IC please does anybody have an idea ?

I have to build an audio pre-amp for an important test next week. Attached is the circuit schematic and deliverables wanted. I would appreciate anyone who could draw out the actual component placements on the attached stripboard print. R10 is a variable resistor in particular the...

hi everyone , i solved a textbook question which says : http://img268.imageshack.us/img268/8994/img1379sa.jpg http://img685.imageshack.us/img685/3228/img1380z.jpg and found analytically : ia = -470 uA, ib = 770 uA , ic = 22 uA, ig= 322 uA, is = 64.5 uA Ra= 1kohms, Rb=2kohms, Rc...

Hi this is my first subject in this forum and i hope you can help 1.we have been given an assignment to analyze this non-ideal op amp with both positive and negative feedback and to be honest i don't even know where to start i know i should post an attempt of trying to solve but honestly...

Hello, I was trying to derive the transfer function of a simple inverting op amp topology, incorporating the output impedance, Ro, of the non-ideal op amp, to see how it, when combined with a load capacitance can induce oscillations (or at least ringing). I haven't been able to get a valid...

Hello, I am an Electrical Engineering Technologist student and we have a design project that i am trying to understand. We are feeding apartment units with 82A of 120V and 68A of 208V. I am going to feed each with two phase lines and a neutral. What I am not sure about is if the 68A of...

To start I have attached an image of the circuit. We are to relate the V_{0}to V_{s}. I am not exactly sure where to start with it. I know that V_{-} and the V_{+} on the op amp have to have the same voltage. The resistor that bridges the two inputs is throwing me off. Not sure if this is the...

Homework Statement http://www.freeimagehosting.net/jqqoz Homework Equations V(output) = V(input)(R2/R1) The Attempt at a Solution The equation above is valid if the back part of the upper circuit (involving R3,R4 and the Earth wire) does not exist. I tried to improvise with it by...

Design a noninverting voltage amplifier which can be varied between 1 and 100 capable of driving a 10 K load to +5V at a frequency of 1KHz. Also how do i design same thing with inverting. Can any1 help me schemetic with multisim or pspice. also make me understand how we should...

Homework Statement Design an op-amp-based integrator with the dc gain equal to -10 V/V (use R1 = 200 Ω and R2 = 2 kΩ). Knowing the gain-bandwidth product of the μA741 op amp, find the proper value of a capacitance C of the integrator so that its 3dB frequency is 50 kHz. Homework Equations...

Hi there! I have here a CAT Standby 650 ekW 813 kVA 60 Hz 1800 rpm 480 Volts generator with CAT 3412C TA Diesel Engine. Im trying to come up with maximum apm load which can be connected to this generator. What formula should I use for that? simple one W=V*A, where A=W/V good enought? Or...

I have tested this circuit on the computer and it works but when I try to make it both on a pcb and breadboard the circuit will not work at all. If i swap the thyristor - TIC106D - for a transistor - TIP121 - the circuit works fine so I think the problem can be isolated down to somewhere between...

Lets suppose a current has a battery, and two light bulbs connected in series. If I measure the voltage on the piece of wire before and after the two light bulbs, will they be the same? And if I measure the amp at these same location, will they also be the same? I know that if I connect volt...

Somewhat unusual question: Do you think LMP7721MA would get degraded by xrays used for luggage screening? It is an electrometer opamp with extremely low input bias current: http://www.national.com/pf/LM/LMP7721.html#Overview Normally the electronics is not affected by the xrays but this...

Homework Statement A thermistor T is included in the circuit shown. Calculate the resistance of resistor R such that the output of the op-amp will change polarity at 6oC if at that temperature the thermistor has resistance 3 kΩ Homework Equations The Attempt at a Solution The...