Recent content by Sirius24

Homework Statement I am working with cosmology and expansion. Obtain dz/dt as a function of z and H_o only. What is the sign for dz/dt and why? z is the redshift and H_o is the Hubble constant. Homework Equations The Attempt at a Solution So I found the equation for dz/dt =...

Homework Statement dJ(x,t)/dx = -dY^2 / dt , where y is the wave equation, and the d's represent partial derivatives. I want to make an assumption that I can describe the wave equation as a stationary state, so my question is the following: What is the definition of a stationary state...

The notation is exactly as I posted it. My homework has two vectors, V1 and V2. The part I'm trying to work with says (V1 X V2)^2. I worked through (V1 X V2) dot (V1 X V2) and (V1 X V2) x (V1 X V2). The result is zero in either case for this problem, but will that always be the case?

I've been trying to find what the square of two cross products is and can't find it. Can anyone tell me the identity for (A X B)^2 ?

I'm in Quantum 1, and the professor briefly mentioned Hilbert Space. I'm having a difficult time finding a non-technical description of what Hilbert Space is. Could someone give me a brief description of what it is physically, rather than mathematically?

Would it be possible to make a differential amplifier go from ground to positive rail by putting V-at zero and making absolute ground into virtual ground?

Out of curiosity, though. Why can't an inverting case work for 0 to positive rails?

With all the lines we have going everywhere, it would be difficult to move things to test at -0.1V, but switching from inverting to non-inverting fixed the problem. Thank you. ~Sirius

The op-amp is an LM358 with rails at 0 V and 12 V. With an any sort of input, I am receiving a 10.9 V output.

I am working on a circuit with someone and our op-amps keep railing. Even when just working with the op-amp, on its own, with an inverting configuration in negative feedback, everything rails. From my understanding, there should be a gain equal to the feedbak resistance divided by the input...

We ended up scraping our design and revertin gack to our old one, which works well enough for its purpose. Thank you for the help, though.

The new one is incorrect. I'll fix the mistakes and post it as soon as I can.

My partner recently re-drew the circuit diagram, and I guess I should have taken a closer look at it before posting. As it is currently set-up on the circuit board is as follows: 1. A differential amplifier. 2. Rails at 0V and 12 V. 3. Virtual ground at 6V. The positive op-amp input...

I am also having an op-amp problem. I want a simple voltage gain through an op-amp with inputs ranging from 0-5V, which will then be fed through an integrator. I am using the LM358 op-amp. The datasheet and the diagram are attached. For some reason, though, I am getting a gain far exceeding...