AMP is a financial services company in Australia and New Zealand providing superannuation and investment products, financial advice and banking products including home loans and savings accounts. Its headquarters is in Sydney, Australia.
The Australian Mutual Provident Society was formed in 1849 as a nonprofit life insurance company and mutual society. In 1998, it was demutualised into an Australian public company, AMP Limited, and listed on the Australian and New Zealand stock exchanges.
AMP has one of Australia's largest shareholder registers, with most shareholders living in Australia and New Zealand. This is because when the society demutualised, all policy holders received shares in the new company.
In 2003, the company demerged its UK operations, creating the Henderson Group.
On 20 April 2018 Craig Meller resigned as CEO after it was revealed in the Royal Commission into Misconduct in the Banking, Superannuation and Financial Services Industry that AMP charged clients for financial advice which was not provided, and misled the Australian Securities & Investments Commission on numerous occasions. More than $1 billion in market value was stripped from AMP shares as news of the company's failings were revealed before the Royal Commission. In the wake of revelations at the banking royal commission and his resignation from AMP, Meller resigned as a financial services adviser to the Turnbull government.AMP board appointed Franceso De Ferrari as Chief Executive Officer of AMP Limited on 1 December 2018.
On 25 March 2021, it was announced that De Ferrari would resign.
So this might be long question that requires some literature review but I will try condense it as much as possible such that hopefully I can get some help without the reader having to review the related paper.
So I will start off by saying that I am involved in a honours thesis in which I need...
TL;DR Summary: How to calculate the operational amplifiers in the circuit diagram
Hello Everyone,
I am trying to learn the circuit diagram of one of a device in which I will be doing modifications as a part of my Masters's Research to make it performance better. My background is in Mechanical...
TL;DR Summary: Trying to solve the op amp current sense circuit as per the schematic.
I want to solve the below current sense op amp circuit,
Are the calculations correct? As of now i modified the circuit by removing the capacitors, i will add them once the above circuit calculations are...
Here is the circuit diagram provided in the book.
In the solution, the book has used the following approach (red markings in the image):
Input to the left transistor is 2V. Considering baseemitter junction drop to be 0.7V, the emitters are at 1.3V (left red arrow). Now, using the "virtual...
Hello!
I am having trouble with this emitter circuit.
I am given U0 as well as all of the resistor values and I need to calculate the following.
## I_c## ##U_{CE} ## ## U_{C} ## ## U_{a} ## ##U_{Ca}## ##U _{Re} ## Now important to note that all of these need to be calculated at the working...
Hello  thank you for reading this, and thank you in advance to anyone who replies and clarifies the mystery of "ground."
I have finally gained a full understanding of how a fullwave rectifier, twopower tube electric guitar amplifier works in a pushpull manner, but one thing remains after I...
Using analog discovery 2 kit and the bode plot produced by the network analyzer is off. The scope looks fine and everything is behaving how it should except for the bode plot. The magnitude of the bode plot will start at the correct dB then right before tapering off it shoots up a few dB and...
Find amplitude, period, PS, VS. graph 2 periods of
$y=3\cos(\pi x2)+5$
ok I think these are the plug ins we use
$Y=A\cos\left[\omega\left(x\dfrac{x \phi}{\omega} \right)\right]+B $
or
$A\cos\left(\omega x\phi\right)+B$
A=amplitude B=VS or veritical shift
$T = \dfrac{2\pi}{\omega\phi}$...
Had this as a question from a class mate. This op amp should not have any gain in the DC or AC circuit. The coupling cap blocks DC and has no reference to get gain, while the AC needs a cap in the feedback loop to get gain. Is that correct? Oh, this is supposed to be in the inverting configuration.
Hello everyone !
I'm working with a piezoelectric cell and I need to retrieve the variation of the charge of the cell as a voltage signal.
I found this circuit (a charge amplifier) with an OP Amp ( here the piezo cell is represented as the current source with the capacitor and the resistor on...
Hi,
I am using an Apex PA443DF operational amplifier to drive a sinusoidal signal at 100 V amplitude across a very large resistor with resistance of about 5000 Mega ohms. The amplifiers are set up as noninverting with a gain of 22 and function very well for small resistive loads. The sinusoids...
Hello everyone, I was thinking how to cancel the class B crossover distortion, may I suggest to discuss an interesting variant.
Let's start from this:
 there is crossover distortion (and no current protection).
The signal source is "full voltage, zero current".
Let's make it "full current...
I have built several guitar amps, but the last one I built burned out a capacitor, can anyone think of a reson for this? it was an eloctolytic, all is working fine now I replaced it.
I was wanting to get a book on Op Amps. Ideally it would have lots of examples but I also need it to explain gain, feedback, and all that important material in an understandable manner.
This is not my subject, but I need to know if I can convert 10 PSI to energy. for example, If I have a permanent magnet motor rotate X time (RPM) to produce 10 PSI. Now Can I invert this process, if I have 10 PSI and let it pass on a permanent magnet motor, How much electricity will produce? in...
Hello,
I am simulating the input impedance of a highpass filter with the output voltage of the filter input to the noninverting pin of an op amp. I'm confused as to why the input impedance can possibly dip below the resistance of the highpass filter resistor. Please see the following circuit...
Maybe you can please give advice. I have a coffee roaster here in New Zealand I would like to bring to the US. It is 400 volt 3 phase 16 amp. It has a blower, a heater and computer components to run it. It is like a very large popcorn machine. Can this work in the US?
Hi Everyone,
I would like to measure voltage output from a sensor via an Arduino. The sensor outputs 20 mV at max capacity. I'd like to bump this up to around 5 volts so it is easier to measure. My plan was to use a noninverting topology coupled with an LM393N opamp. The schematic for a...
I've been given the following circuit and have been asked to find the input impedance and the impedance between the input terminal and ground. I've never encountered an operational amplifier configured like this.
I know that the voltages at the  and + terminals of the op amp are ideally equal...
Homework Statement
Homework Equations
CMRR = Av/Acm
Acm= Δ/R , Δ = (2 x Tolerance of Resistor).R
The Attempt at a Solution
I have to admit I am a bit confused by the premise of the problem.
My understanding is Vout is used to vary Vcharge in some way, so that Icharge is always 1.3 A. Then...
Homework Statement
Solve for Vout
Homework Equations
Vout=Vin(1+Rf/R)
The Attempt at a Solution
I get it is a noninverting op amp but there is no resistor from the noninverting terminal to the output.
I have no idea how the equation would be. I understand that noninverting is...
So, from my textbook, and what seems to be standard, an inverting amplifier circuit goes something like this:
However, when I switch the terminals of the op amp and follow through with the equations, I get the same Vout.
So my question then is what is the difference? I know there is other...
I was told once that two 1 amp tv type diodes parallel will not work because one will always carry the load, but I am working on a car 30 amp battery charger and it has 6 diodes 1/2" press in type all parallel same as from a 10DN series Delco alternator from the 60's where they used three...
Someone is asking me how much current in a loop of wire the diameter of the Earth to make the same level of magnetism the Earth has?
I hope I am asking this correctly.
TIA
Clark
I have constructed a gain clone type amp based on the LM3886 chip from Texas Instruments. I have wired it using some available 16 gauge stranded wire. It is powered by a centertapped 34 volt (68 volt total) transformer that is fused by a 2 amp fuse. It is working with no issues however I would...
So this is the circuit of a filtre and it's complex schema :
The question was find the fonction S/E .In order to find S/E , I had to sum up impedances in serie or parallel, for example R2 and Z2 have the same current so we put R2+Z2=Z', but can I sum Z1+Z' ? since they have different current...
I am having a very difficult time verifying the equations for full differential amplifier. I literally read all the articles I can find from Google. Here is one of the question I think the paper by Jim Karki is wrong. The equation is equation (9). I verified the rest of the equation already...
These are the links to the specific product I am looking at and its noise characteristic graph.
http://www.emelectronics.co.uk/a20.html
http://www.emelectronics.co.uk/graphs/a20graph.htm
I understand the graph for the most part, but I am confused about which one of the four filters that are...
Thought I would share my latest project. I decided to make a stereo amplifier out of Vacuum tubes. I think I finally have the noise and distortion levels as low as I can get them. The amplifier outputs about 88W rms per channel before it clips the output.
Here is the internal wiring
This is a...
I am trying to connect a second pair of speakers to my amp without the use of wires. It is really only one speaker position where running wires is impractical.
Homework Statement
see pic in the attachment
beta = 100
Homework Equations
Rinput=Rth
Vinput=VTH
iB= ic/beta
IE=ic /alpha
iB=iE/(beta+1)
gm=IC/VT
Avo=gmRC
Av=gm(RCRL)
Gv=Beta[(RCRL)/Rsig+(beta+1)re
re=alpha/gm
The Attempt at a Solution
solving each stage separately. First DC analysis...
Hey,
I'm building this simple tube amplifier amplifier as a warm up to some hopefully bigger and better audio tube projects.
http://diyaudioprojects.com/Solid/12AU7IRF510LM317Headamp/
I realize the LM317 is configured as a charge pump but I don't exactly understand its purpose, Could...
Homework Statement
Finding closed loop gain and Ip and In current in op amp
Homework Equations

The Attempt at a Solution
I started by trying getting voltage divider for points between R1 and R2 as (R2/(R2+R1))Vs and between R4 and R5 similarly. And I'm not sure how to continue on. Any help...
I have a 2 AMP regulated DC power supply, with variable voltage 3  12 v. If in a small circuit, i.e, small copper wire with 1 ohm resistor. Why am i not getting at max Amps?
Picture for reference is below.
I'm confused as to how this is able to receive a differential voltage of +/ from a single power supply. (Yes, I know the picture says dual power supply.)
Normally I have to short the negative to ground on one side of a dual power supply, and short the positive...
Homework Statement
I recently completed a lab where I set up a buffer amp. Its input was a function generator set at 5Vp amplitude and we placed various load resistors on the output to test Vout on an oscilloscope ( 75kΩ, 3300Ω, 510Ω and 68Ω.) From my data I noticed that the Vout was the same...
Homework Statement
Solving for this circuit here, where V = 5V
Homework Equations
The Attempt at a Solution
I found the equation for a summing op amp like this one, plugged everything in and ended up with 3V, which is marked wrong. I'm really at my wit's end here and the homework has been...
Hello there, this isn't necessarily a homework question. I came across this qn during revision and didn't know how to solve it. Any help would be greatyly appreciated.
The answer is 0.97
1. Homework Statement
For the ideal OPAmp in negative feedback configuration shown in Figure Q30...
There is this debate in car audio forums of this question whether it is better to connect your amp ground to the frame of the car or the battery.. basically they haven't came to a conclusion so I was curious what you guys think...
Basically what I mean is that when you hook up an amp in the...
Hello
I am currently have difficulties trying to measure dcmodulated voltages while applying a dc current, via Sr830 Lockin Amplifier (LIA).
Basically, I apply an 2 GHz ac current (amplitude modulated@10kHz and referenced to the LIA for lockin measurement) and a dc current to my DUT...
Homework Statement
Determine the Op amp gain of the following circuit.
V1 = 1v Vo = 4 V
Homework Equations
A = Vo/ VI
The Attempt at a Solution
Using voltage division I determined the voltage for the node at the +ve terminal
VI = V1(1k/ ([1000 + 1]k)) = 1/1001 V
Vo = 4v Given
Therefore...
Hi,
With all the various RF coming from things in my own house (cell phones, TV, cable modem, electric motors, etc.) and from outside I need to try to limit that interference while working on amps.
Disregard for the moment, interference coming in through the AC mains. I also want to explore...
Hi Guys,
This was my first attempt at trying to make a case and covering it. I made a few mistakes and learned a good bit about the process. I think I learned enough to do a good job on the next one. Education is never cheap...lol
The amp is basically a AB763 with a few mods. The current...
It takes real machines to build big amps!..lol
11 tubes, 2 channels, tube reverb, 100 watts, channel switching, DC tube heaters...somewhere in all this I must have lost my mind!...lol
I guess tomorrow I will see if this beast will work. It is by far the most complex amp I have dreamed...
Hi,
I am struggling with this a bit. I think this will work but I am not sure. Can you guys take a look and see if I have made any obvious mistakes. The B+ voltage should be around 480 VDC loaded. I am still working on the channel switching.
[PLAIN]http://
Thanks,
Billy
Hi,
Thanks for all the kind help answering my goofy questions guys. Here is the results.
This is a reproduction of a 1956 Fender Deluxe with modern case covering. The cloth is seat cover material from a vintage Porsche 911. The sides are black leather. Minor change to the the grid...