# 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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### 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 ...
1answer
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 ...
1answer
108 views

### 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 ...
3answers
5k views

### 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 ...
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 ...
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 ...
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 ...
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. ...
2answers
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 ...
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 ...
3answers
2k views

### 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 ...
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: ...
7answers
15k views

### 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 ...
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 ...
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,...
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 ...
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 ...
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 ...
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 ...
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 ...
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, ...
2answers
2k views

### 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 ...
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 ...
5answers
51k views

### 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 ...