Questions tagged [wave]
May refer to an electromagnetic wave (such as a radio wave) or the PCB manufacturing process of wave soldering.
359
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How to connect the transformer in this three-tube DC regenerative shortwave radio from aliexpress?
I've bought a three-tube DC regenerative shortwave radio on Ali-Express/China just to try building.
As far as I can tell all the parts are here except for one thing. A schematic.
Has anyone tried ...
- 21
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1
answer
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Can a photon be modeled using AC driven electron and AC driven wire loop?
Can a photon ("electromagnetic wave packet") be simulated in software as an electron bouncing up and down (for the oscillating E field) and a loop of electrons with neutralized electrostatic ...
- 103
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Voltage in the transmission line
In a power transmission line, the voltage at any point in the transmission line (along the length)is said to be the sum of the incident and reflected wave components of voltage. And if it is such then ...
- 99
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Transmision and coupling coefficient in waveguide and ring resonator
A simple ring resonator with a bus waveguide is described by:
\begin{equation}
\begin{pmatrix}
B \\
C
\end{pmatrix}
=
\begin{pmatrix}
t & \kappa \\
-\kappa^* & t^*
\end{pmatrix}
\begin{pmatrix}...
- 145
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5
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Contradiction between wave impedance mismatch and transmission line theory
Suppose we have two transmission lines connected with each other, each transmission line has the same characteristic impedance: $$ Z_0 = \sqrt{\frac{L}{C}} $$ however they don't have the same ...
- 481
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1
answer
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Wave Propagation: Attenuation Constant in a Lossless Dielectric
I am referring to M. N. O. Sadiku, Elements of Electromagnetics, 7th ed:
In chapter 10, the expression for the attenuation constant α in Np/m in a lossy dielectric is derived as:
$$
\alpha = \omega\...
- 111
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How are the currents induced by the E-field and H-field flows on a sphere? [duplicate]
Please correct me if I am wrong?
We consider a sphere made of thin metal, with a radius of 1 m, at 20 km distance from an AM transmitter operating at 1 MHz. The alternating current in the transmitter ...
- 1
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Solder Wave Residue
Issue: 1-3 days after maintenance, chunks of solder residue starts to show in the solder wave bath. This creates blockage in the nozzle. Any notes how to solve this problem?
Notes:
No new chemicals ...
0
votes
3
answers
259
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XR2206 Signal Generator breaks up and distorts badly all waveforms
I just put together this signal generator with a xr2206 DIY kit, single supply, tried 9,6V smps first (too low!), then w/ checked speced minimum 12V DC Li-Ion Vcc, same behaviour, distortion/unstable. ...
- 21
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0-12V square wave to linear 12V
Can anyone help me with the design of circuit?
I need to use a zero to 12V square wave input and output a linear or straight 12V to carry 2 amperes.
I think a collection of capacitors and an inductor ...
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2
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2
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How can a Faraday cage absorb and reflect waves, yet antennas mostly absorb and can be used on signals?
I understand they are very different in structure but comparing a simple monopole to a Faraday cage, they both are constructed from metal. Why is it the sides of the Faraday cage absorb the waves and ...
- 667
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3
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100
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Electrical wave propagation in wire vs space
Does it take the same amount of time for the lamps to turn on? Or does it take three times longer for the right lamp to turn on?
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73
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What is the actual physics and reasoning for the “Ground plane” underneath a GPS patch antenna
From my very limited knowledge of EM, I believed that anything tied to earth can absorb radio waves, so if an antenna was to be placed above a ground plane, why does the ground plane not just absorb ...
- 667
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Square wave rectified output value calculation
I can understand the ground osc probe but with a hand osc I shouldn´t have that problem, I think.
But It went even worst. Maybe it is a doubler¿?
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Please help me understand this amplitude modulation LC oscillator
I have a problem understanding the circuit below where the LC oscillator is used to produce the negative cycle wave for the amplitude modulation.
I am having a difficulty in grasping the fact that the ...
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