# Questions tagged [wave]

May refer to an electromagnetic wave (such as a radio wave) or the PCB manufacturing process of wave soldering.

359 questions
Filter by
Sorted by
Tagged with
112 views

### 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 ...
27 views

### 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
37 views

### 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
44 views

### Transmision and coupling coefficient in waveguide and ring resonator

A simple ring resonator with a bus waveguide is described by: \begin{pmatrix} B \\ C \end{pmatrix} = \begin{pmatrix} t & \kappa \\ -\kappa^* & t^* \end{pmatrix} \begin{pmatrix}...
• 145
486 views

### 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
1 vote
60 views

• 111
1 vote
53 views

### Effects of ferrite isolator on waveform

I have recently measured the standing wave signal from a waveguide. I notice that as the frequency is lowered the signal tends towards a sawtooth wave. ** My guess for why this happens is that the EM ...
• 11
123 views

### Do electromagnetic fields undergo any variation between fields in time, or do such waves just expand in time and in their spherical plane?

In literature it is routinely said that an electric field generates a magnetic field, and thus one field creates the other "eternally", and that this explains their propagation. Am I wrong ...
59 views

### Nodes are moving. Can it be called a standing wave?

Please see the following youtube video. https://youtu.be/MJKfyLfY9Pg It is a lossy transmission line. The resultant wave of incident and reflected wave is also moving. In a standing wave, neither the ...
154 views

### I need a way to use analog electronic components to invert an irregular wave [closed]

I am doing a personal project wherein I am using an EMG sensor on my muscles, amplifying the output, and then running it to a lead on a motor. What I can't figure out is how to invert the irregular ...
1 vote
571 views

### Generate a sine wave with MCU

I want to generate a sine wave without an offset voltage. I generated a sine wave from 0 to 3.3 V and it has a 1.65 V offset. I need a sine wave from -1.65 V to 1.65 V using an MCU. How can I do that?
854 views

### Why does this inverter use two bridges?

I recently destroyed a 1000 W-rated 24 VDC -> 220 VAC pure sine wave inverter I bought a while back from Ebay, by connecting its output to mains power inadvertently. Afterwards, I decided to ...
• 57
160 views

### Using An nRF24L01 Module With A 2.5GHz 5dBi Antenna?

I have a basic knowledge about Communications and Antennas, so i was wondering what will happen if i used a 2.5GHz 5dBi antenna instead of a 2.5 GHz 3dBi one?![Images Are Listed Below]. To be specific,...
269 views

### 125 kHz Arduino RDM6300 read issue

I've tried to read a 125 kHz signal with an Arduino using an RDM6300 module, but it didn't work. I tried to catch the signal with Audacity. Please find attached photo with the signal. How can I catch ...
• 11
119 views

### Square waves (Hall-effect sensor)

I'm replacing the gearbox of my truck. Both gearboxes (the old one and the new one) have speed sensors in the output shaft, but they don´t produce the same signals. In order to make the new sensor ...
241 views

### Reflected wave phenomenon - transient response and steady state of a transmission line

I'm currently trying to design a PWM driver for an impedance-mismatched long cable. Sending rectangular pulses (rise-fall time ~0s) over a long cable that is not matched with its impedance results in ...
• 39
235 views

### Need 64Hz square wave green LED driver for a mosquito zapper

I have several 10 watt COB (Chip-on-Board) green LEDs which apparently are the best color to attract mosquitoes if driven at an ideal pulsing square wave frequency of 64 Hz. I was going to use a ...
774 views

### Square wave distortion at low frequencies, high-pass filtering, AC coupling

This is an update on my previous question. As Hearth suggeste, I changed to DC coupling on my scope. This is what I got: That's a clear change. Not a perfect square waves but I guess it is because of ...
796 views

### Square wave distortion on low frequencies

I have this old Soviet low frequency sine and square pulse generator "G3-36A". I ran into an interesting problem. When I try to generate square pulse under 100Hz I get a distorted wave. ...
2k views

### Rail to rail +12/-12 V square wave generation with microcontroller

I need to generate a +/-12 V square wave, +/-0.4 V tolerance is allowed. The purpose is to drive the pilot signal of an electric vehicle level 2 charger, for those curious. EDIT (clarification): what ...
• 311
152 views

### Sort of square wave shift or cleanup

I have a wave I want to feed into an Arduino to measure frequency. I need the wave to hit zero to measure the frequency, I think. A nice clean square wave ideally. I am using a simple 4.3V Zener ...
270 views

### Converting square wave into a sine wave [closed]

I am trying to convert a 1 MHz square wave into a sine wave of the same frequency. What's the best way to achieve this?
406 views

### 1 Hz ring oscillator not working

Inspired by this project I built a ring oscillator that outputs a 1 Hz signal. Using their formula, I decided to use 1K for R1 and R2, and 558 uF for C1. I used a CD4069UB CMOS inverter that has a ...
• 33
175 views

### Problem in the book "Radio Antennas and Propagation"

I came across a problem in an electronics textbook by William Gosling, Radio Antennas and Propagation. I am an undergraduate and I sent this to my lecturer to help solve but unfortunately, her answer ...
1k views

### Frequency of square wave generated by Wien bridge oscillator

I have designed the wien bridge oscillator circuit for 20Hz square wave generation. It gives a 20Hz sinusoid as output when I keep the non-inverting amplifier gain 3V/V. But when the non-inverting ...
• 179
2k views

### Circuit that converts sine wave to RMS voltage

How do I design a simple circuit that converts a sine wave to an RMS voltage? The input will be a sine wave and the output an RMS voltage. I know I will need an ADC, but not sure which one. I also ...
74 views

### EM radiation hitting atoms [closed]

What happens when the EM wave is incident on a atom? Do the de-localized electrons in the atoms or the valence band electons move in the direction of the electric field? Also when the electrons move, ...
103 views

### Photodiode square wave positive duty cycle lower and lower

I drive an IR LED with a 50% duty cycle square wave and receive its signal with a photodiode. If I take the photodiode farther and farther from the LED, the signal's positive duty cycle is lower and ...
• 77
1 vote
509 views

### Double conversion UPS off a modified sine input?

I have a 2000W modified sine wave inverter running from 12V bank in a tractor-trailer. It’s company owned, so no changing or adding equipment. Only viable solution I can see to achieve a sine wave is ...
• 19
2k views

### Precise square wave generator 32768 Hz

I need to create a circuit to generate a square wave with 50% duty at 32768 Hz +/- 5 Hz. The output of the circuit will drive an NPN transistor ( 0.2 A , 24VDC ). The cost of the component is not a ...