Questions tagged [square]

A square wave is a non-sinusoidal periodic waveform in which the amplitude alternates at a steady frequency between fixed minimum and maximum values. The square wave is a special case of a pulse wave which allows arbitrary durations at minimum and maximum. The ratio of the high period to the total period of a pulse wave is called the duty cycle. A true square wave has a 50% duty cycle (equal high and low periods).

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4answers
5k views

Why sine wave not square wave?

Rectifying square wave voltage seems to give us DC directly without the need of a capacitor. so, why do we prefer sine wave over it? What would change if I powered any adapter (laptop adapter as ...
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471 views

Why do musical tesla coils sound more like square waves?

When people modulate their tesla coils to play music, it sounds like a very sharp square wave, as opposed to the electrical signal, a (roughly) sine wave. Why doesn't the tesla coil sound like a sine ...
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I need to add two signals having different frequencies [closed]

For my work I need to add OUTPUT from a PWM controlled Mosfet, with the current passing through the motor. I looking for some circuit to do this operation, I don't know how to proceed. Can you guys ...
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How do you shift a square wave down?

I have a square wave the oscilates at 25khz from 0 to 30v. I would like it to oscillate from -15v to +15v. Is there a SUPER DUPER SIMPLE circuit to do this? Keep in mind it's going up and down at ...
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1answer
2k views

Measuring the L/R ratio of an LR circuit

I have the circuit below (fig.1) that I found in a board of an old machine. The input signal is a square wave with 10 Hz frequency and 10 V amplitude. I measured the waveform on the primary side of ...
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1answer
321 views

High-current capable (±250A) AC power-supply, sine wave/square wave (±20V)

I hope you will find patience to read my beginner question. I need to do some test on a diode using a simple setup: AC power supply + load + diode. The problem is that I must generate a sinusoidal or ...
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1answer
564 views

Peculiar noise when observing a square wave

I'm using the following function generator: http://www.farnell.com/datasheets/499058.pdf?_ga=1.129729036.1263433037.1467971694 and a Tektronix TDS 1002B scope for some measurments. Most of the time I ...
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1answer
579 views

How to amplify a 25khz square wave that goes from -3.3v to +3.3v so that the amplitude is doubled

I have a 3.3v power supply (lithium ion battery) and am using a TI MPS430G2553 chip to generate a 25khz square wave using 2 PWM pins and a push-pull setup. This square wave goes from -3.3v to +3.3v. ...
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638 views

Square wave filtering with d-flip flop

I have a square wave (1st line), I want to skip every odd impulse, and output every even one without change, as shown in the second line. Is this different from frequency division? What is the proper ...
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3answers
463 views

Anyway to avoid the startup delay on square wave generator (e.g. 555 astable) circuit?

In the classic 555 astable circuit the external capacitor charges to 2/3 of the Vcc (through R1 and R2) and then is discharged to 1/3 of Vcc (through R2) and then it continues to oscillate between 1/3 ...
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3answers
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Peak and RMS voltage for a sine wave

I only need help with part C). What I've done for part B) is square the wave, which makes Vpeak->V^2peak and the waveform in the negative region(under the period axis) become positive AND squared(like ...
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3answers
792 views

Square wave at line frequency. How does it work?

I found the following circuit next to a switching power supply in an electrophysiology amplifier (AXOPATCH 200A, an instrument for a technique called "patch clamp"). References to power outlet: L: ...
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7answers
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What is the best way to get a sine wave from a square wave?

I have square waves of different frequencies (1KHz to 20KHz), and I need to convert them to a sine wave of the corresponding fundamental frequency. A RC ladder Low-pass filter was the first thing ...
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0answers
508 views

Relation between frequency and inductor current

I have a question regarding frequency and inductance. What is the relation between frequency of an applied voltage that is square wave, over an inductor, and the average current that would flow ...
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4answers
123 views

Variable Resistance

simulate this circuit – Schematic created using CircuitLab This is a pulse generator, outputting square pulses with about 8% duty cycle. Tuning R2 down to 120k will result in the same high time,...
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2answers
1k views

Bipolar Square Wave Generator

The design requirement is to generate a +/-12V square wave from a 0-3.3V square wave at 1kHz. Here is what I came up with: PILOT_CTL is the 0-3.3V square wave and the end of R6 should be the +/-12V ...
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2answers
408 views

creating a bcd squarer using verilog

Basically, I am using a lookup table to output in bcd the square of a single digit bcd. The problem that I have is that it is not outputting the correct answer. For example: the result I get for the ...
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1answer
3k views

Fourier transform of a rectangular pulse

I'm interested in knowing: 1. Why the frequency content has a larger magnitude at low frequencies 2. Why the magnitude is zero at frequencies which are composed of multiples of the rectangular ...
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1answer
471 views

Crosstalk Question

Could somebody explain me how could I predict the crosstalk between tracks.From what I know about this are two types of crosstalk: inductive and capacitive.Inductive from what I read is the worst.For ...
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1answer
199 views

Convert PWM to 3-level voltage

I want to convert a generated PWM by a microcontroller to a 3-level voltage. [] the maximum output voltage range is between -5 to 5 or -10 to 10 volts. Another point that may well be considered is ...
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1answer
1k views

Square generator 1KHz to 1MHz with 1KHz precision

I would like to make a square wave generator which will output a signal with amplitude X voltages and frequency between 1KHz to 1MHz, with the precision of 1KHz (for example: 785kHz, 926kHz, 999kHz, ...
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2answers
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How do you convert a changing input (square wave) into a single high signal?

I am designing a circuit which will output a square waveform for a specific duration of time (t) but I need to be able to read the square waveform using a processor so would like to turn the changing ...
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2answers
724 views

+5 to 0v square wave from a 12vdc supply

I need to build a simple 0 to +5v square wave from a 13vdc (automobile) supply. The frequency of the output needs to be based on a 1vac input signal. I believe it can be done with a handful of ...
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5answers
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Sine wave to square wave - Schmitt trigger

I need to transform a bipolar sine wave (varies from -5 V to 5 V, 1 kHz) to a square wave for further digital processing (0 to 3.3 V), as in this image: The important thing is ...

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