The wave tag has no wiki summary.
0
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1answer
40 views
12 volt DC to 12 volt AC sine wave inverters for 10 watt and 22 watt pumps
I have two 12 volt AC small water pumps that I want to run on 12 volt DC (solar). One pump is rated 6 watts (max ~10 watts) and the other pump is rated 16 watts (max ~22 watts). Since I need to ...
-4
votes
1answer
98 views
What kind of waves can penetrate walls/floors and cause tingling, headache, nausea, etc? [closed]
What types of waves would be able to penetrate walls and floors and at high frequency or intensity would cause symptoms like tingling or burning skin, headache, nausea, and heart palpitations? I know ...
1
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0answers
57 views
Waves and Antenns
What is meant when someone says that a wave is linear and reciprocal, and also what is meant by antennas are linear, bilateral and passive
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5answers
754 views
How to Generate a square, sine, and triangle wave with DC input
I want to make a simple synthesizer as a start to audio electronics. I want to start with a simple square, triangle, and sine, which the user can vary the pitch.
Is there a simple circuit to do ...
3
votes
1answer
391 views
How to apply the Barkhausen criterion in order to know if a system will oscillate?
How to analyze or apply the Barkhausen criterion for oscillation of the astable multivibrator below?
The criterion talks about the magnitude of the products in a loop must be equal to 1 (ideally)
...
6
votes
5answers
485 views
Suggestion to electrically disable a Faraday Cage
My plan is to ultimately develop an Autonomous Faraday Cage. The project seems very straight forward; however, I am unsure on how to effectively control the cage (turn on and off).
I have constructed ...
1
vote
1answer
122 views
Dump verilog array in gtkwave
Is there a way to dump the memory in verilog using vcd dump?
Since now i have written this:
...
1
vote
3answers
175 views
Wobble Bass LFO circuit with Op Amps
I am trying to build a LFO circuit that produces a wobble bass effect.
My overall plan is using an Op Amp to create the LFO and another Op Amp to create the low pass filter. How should I connect ...
1
vote
3answers
134 views
Trying to understand range and frequency of an RFID reader
I am trying to understand how range of communication between RFID reader and tag is related to frequency and power.
1- So if I increase frequency, the range will be shorter or larger? why? (I need ...
3
votes
3answers
482 views
How does an swr meter directional coupler work?
How does the directional coupler in an swr meter work? How are the forward and reflected waves separated out from the standing wave on the feeder?
I would like an answer in terms of sine (or cosine) ...
0
votes
2answers
202 views
How to create a square wave signal with 120MHz
What is a cheap way to generate a square wave with a frequency of 120MHz. I've been thinking of the following solutions:
* Use a Raspberry Pi, then use a timer or something from that board
* Use an ...
0
votes
1answer
182 views
Calculating what frequencies a dielectric can be considered perfect
I have a problem that is likely going to be on my E&M final this semester that my classmates and I can not figure out how to solve. The question is
At what frequencies can Earth be considered ...
1
vote
1answer
101 views
Antenna that can be used for large range of frequences?
Is there an antenna or device that can be used for WiFi, NFC, bluetooth, GSM for use with a frequency counter to measure the frequency of the waves?
-1
votes
1answer
98 views
Determing the Phase Angle of the following code: [closed]
I'm trying to determine the phase of xx after the code is run. You shouldn't need to actually run it to determine it however, as it is unclear on the graph. The two phases present appear to be (-3*j) ...
1
vote
2answers
496 views
Measure AC Sine Wave amplitude with ADC
I have created an AC sine way using a wien-bridge network.
I would like to measure the peak to peak voltage of this wave using my microcontrollers ADC.
I cannot just use this wave as an input to my ...
3
votes
1answer
187 views
Oscilloscope acquisition frequency
I have an FPGA design and the FPGA design has a signal called start which is always high. Here is how it works. I use the computer to send data over RS232 to FPGA, the start signal drops for a cycle ...
0
votes
0answers
239 views
Bandpass filter [closed]
I have drawn a bandpass filter for 833Hz and use microsim simulation to test my circuit. Does anyone know why sending in a sine wave results in a triangle wave as output? When i test it on my 50Hz ...
14
votes
5answers
3k views
What exactly are harmonics and how do they “appear”?
From reading so many sources online, I still cannot grasp why a different waveforms have harmonics.
For example: when designing a silly amplitude modulation (AM) circuit that puts a square wave from ...
-2
votes
2answers
253 views
Transformation of Sin wave
I was impressed by your solution of my previous problem. So, I think you may help me with this image
I have made huge circuit with OpAmps and couple of active and passive components, but I suppose ...
2
votes
3answers
570 views
How to get half frequency square wave from sin wave?
The task is to get such wave:
I can get square wave from sin wave, but I have no idea how to make it half-frequency. Have some advices?
1
vote
2answers
678 views
Error caused by Scope or Function Generator?
This question may not be valid, please excuse my ignorance. I am having difficulty measuring a decent square wave at 500kHZ. The image below shows a 4 volt CMOS output with a frequency of 500kHz ...
3
votes
2answers
678 views
QAM modulation - how data in different frequencies are laid out?
I know that QAM modulation uses a change in phase and amplitude to send data. But We use a series of frequency spaces as bandwidth to send data.
However, we know that different frequencies oscillate ...
4
votes
3answers
485 views
Communication - 2 Battery Powered Circuits, 1 Conductor, no common ground
TL;DR I need to do is successfully transmit a wave across a single conductor between two battery powered circuits with no common ground. I already know how to create the wave and detect the wave when ...
7
votes
3answers
2k views
Changing a Signal's DC Offset
I have a square wave being generated from a waveform generator oscillating between 0 V and 5 V. The generator does not support negative DC offsets. I need to shift this signal down to be centered ...
9
votes
7answers
2k views
Differentiating between a square wave or sawtooth wave with a circuit…?
I want to build a simple sensor that takes a 100 kHz square or sawtooth wave with a known amplitude and outputs a high if it receives a square wave or a low for sawtooth.
I'm pretty sure this ...
1
vote
2answers
2k views
Relationship between sampling rate and number of levels/bits in PCM
It is said in the books that increasing the levels of quantisation codes in Pulse Code Modulation, or in other words increase the number of bits, could give a better signal.
I understand that having ...
2
votes
3answers
247 views
Where should an increase in harmonic frequencies go in the Nyquist formula?
From the Nyquist formula that \$ Capacity = 2 \times Bandwidth \times log_2(L) \$, where \$L\$ is the level the signal represents, the total number of possible bit combinations the signal can ...
4
votes
2answers
795 views
Why Periodic Signals has only integer frequencies but non-periodic does not?
Why does a periodic signal only has integer frequency values while a non-periodic one has all real numbers as frequency values?
The frequency is just the number of times one full cycle has happened ...
6
votes
3answers
3k views
How to read serial data from oscilloscope
I have a microcontroller (PICAXE 20X2) and a pot meter. I programmed the micro so that it sends any change of pot meter to serial port of PC. Obviously it is a 8bit ADC. Now the interesting thing for ...
2
votes
2answers
170 views
How to interpret wireless communication signals after being recorded?
Hypothetically, lets say you had a radio plugged into your computers microphone port. You record a certain specific signal in audio format to an .wav file. This signal is meant to be a small digital ...
1
vote
2answers
264 views
Sine Oscillator - for audio frequency
I'm looking to create several sine waves on a single circuit. All must be under 20Khz frequency and each must be unique. Mostly it will be 5-10 frequencies needed.
As I found - almost all crystal ...
2
votes
3answers
76 views
Correct Term for Radiation Pattern of Target
I am hoping that this is the right forum for questions related to radar systems.
The radiation pattern for an antenna is (a plot of) the relative strength of an emitted antennas signal as a function ...
15
votes
4answers
702 views
4
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3answers
947 views
Playing a low res WAV/PCM file using a Basic Stamp II microcontroler speaker
Is there a way to convert PCM data to PWM impulsion so that I can send it a basic stamp microcontroler in order to play audio on a external speaker ?
(without using an IC)
3
votes
2answers
543 views
When do non-TEM waves occur?
Yesterday, I read about TEM waves on wikipedia. Those are waves that have no electric or magnetic field vectors pointing into propagation direction of the wave.
But on any picture illustrating EM ...
6
votes
3answers
531 views
How do I measure loudness?
I was toying around with an idea for a digital musical instrument with breath control. I've successfully experimented with pressure sensors and they are probably the right way to go, but my first idea ...
14
votes
8answers
3k views
What's a good square wave generator?
What's a good circuit to use to generate a square wave? The exact waveform isn't too important - I just want to get a piezo buzzer cranking at 150 kHz. I also want efficiency and adjustable amplitude.
...
