# Recent content by p75213

1. ### A more efficient transformer

None of the above. The idea is to remove the back emf from the secondary to the primary. The result of doing this is to reduce, if not cancel, the increase in amperage draw from the source due to the load on the secondary. Effectively the source only has to supply enough current to maintain the...
2. ### A more efficient transformer

Surely if you only have to maintain the magnetizing current that creates the magnetic flux that has to be efficient.
3. ### A more efficient transformer

Well think of a capital 'E' turned on its side with a connecting piece across the top. The primary coil is wound on the center leg and the secondaries wound on the two end legs. This transformer would only work one way.
4. ### A more efficient transformer

I have been reading about mag-amps which gave me an idea for a more efficient transformer. So the core is in the shape of a square or rectangle with a center piece dividing it into two. The construction of the outer core is larger (less reluctance) than the middle leg (greater reluctance). The...
5. ### Capacitor Voltage

The charging path is what I am interested in. Your right - I don't understand the circuits operation.
6. ### Capacitor Voltage

dVc/dt = VpSin(ωt)*1/RC*e-t/RC+(1-e-t/RC)*Vp*ω*Cos(ωt) Don't ask me to plug values into that or graph it. I've already tried and can't get anything to either calculate a result or graph it.
7. ### Capacitor Voltage

Hi, I am trying to figure out the peak voltage across a capacitor when charged by 1/2 wave rectified AC. The formula for instantaneous voltage is : Vc=Vs(1-e-t/RC) where: Vc=Capacitor voltage, Vs=Source Voltage, t=time RC = the capacitor time constant So I thought I could integrate with...
8. ### Energy in a capacitor

This post is inspired by a lesson on the allaboutcircuits education website. In chapter 15 of Direct Current there is a heading "Inductors and Calculus" - https://www.allaboutcircuits.com/textbook/direct-current/chpt-15/inductors-and-calculus/ At the bottom of the topic there is a circuit...
9. ### Plasma Multipactor

I have been reading a patent by Gene Meeks of a plasma multipactor. Meeks was the right hand man of Philo Farnsworth the "father of television" and worked with him on the 'fusor' - a small nuclear fusion device. Meeks's multipactor appears to be a self sustaining over unity power device...
10. ### Independent Component Analysis vs Single Spectrum Analysis

Homework Statement Hello, I have implemented single spectrum analysis and independent component analysis against a time series (in this case the euro foreign exchange) as a smoothing indicator. The ssa algorithm I purchased from: Caterpillar-SSA - http://www.gistatgroup.com/cat/programs.html...
11. ### Single Channel Blind Source Seperation

Homework Statement I am trying to figure out how to do independent component analysis on a single stream of time series data. The ica algorithm comes as part of the it++ package however it is necessary to perform some preprocessing on the time series data as ica works on the premise that the...
12. ### The mean of the Probability Density Function

Thanks guys. I've done some more reading and investigation. Rather than the mean I prefer to think of it as "expected value".
13. ### The mean of the Probability Density Function

Homework Statement The mean of a function is as follows: $${1 \over {a - b}}\int_b^a {f(x)\,dx}$$ So why is the mean of the PDF as follows: $$\int_{ - \infty }^\infty {xf(x)\,dx}$$ I thought it would have been this way: \lim \,b \to - \infty \,{1 \over { - b}}\int_b^0...
14. ### Ideal Transformers and Lenz Law

Thanks for that
15. ### Ideal Transformers and Lenz Law

Hi, Can somebody answer this question? The induced magnetic field of the secondary coil opposes the magnetic field of the primary. Therefore there is a lower magnetic field on the primary - lower impedance and a lower voltage drop. This results in an increased primary current which will...