# 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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### Jump in RC current response to a square wave

Periodic square wave feeding an RC circuit: I am currently studying RC filter response to a square wave input with a period of $T_1 + T_2$. I have understood about voltage expressions and current ...
1 vote
152 views

### Playing around with an astable multivibrator

I had a doubt regarding the astable multivibrators using BJTs. This is a typical astable multivibrator. I have been told that if I connect a capacitor to the output channel, there would be no ...
59 views

### Running a signal generator and signal dependent load on the same power supply

I want to use a square wave generator to drive a load in the same circuit but I am confused about how to do so. Here is what my current circuit looks like: simulate this circuit – Schematic ...
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### Transformer output voltage not rising with input voltage

I recently stripped a microwave of its transformer and I was looking forward to playing around with it. I didn't want to plug it directly into the wallsocket so I decided to design a circuit that can ...
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### LF353 for 12-0V square wave from arduino

I have built the following circuit with an LF353N op amp and expecting 0-12V outputs from it. I have built it on a breadboard but the output is always around +12V except the when the (+) input is ...
1 vote
426 views

### Circuits that can generate a square wave current

I was searching around for circuits that could generate a square wave and I noticed that they all have only one output and can't generate a current. For example: Now, measuring across the positive ...
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1 vote
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### How could I give a square wave input to a circuit using NI-DAQ-USB-6001 and LabView? How could I read the peak to peak voltage using DAQ-USB-6001?

I need to give a square wave input to my filter circuit using Ni-DAQ-USB-6001 and LabView. Could someone help me with how can I do that? I also need to read the filtered wave and peak to peak voltage ...
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1 vote
193 views

### Why TL071 doesn't act as a comparator?

I am trying to obtain a square wave using a comparator and a sine wave signal. Sine wave has adjustable peak to peak amplitude with +10/-10 volts as limits. TL071 runs with +12/-12 volts. Sine wave ...
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224 views

### Amplifying pulse from 4 V to 24 V

I currently have a problem where I want to amplify a 4V square pulse signal to a 24V square pulse signal, for a Q-switch input. I tried using op-amps (LM358N) in a non-inverting amplifier ...
882 views

### How to create square wave circuit

I wanted to create a square wave that alternates between positive and negative voltage with a full cycle time of 8ms and a 50% duty cycle. So is there a way I could make a circuit that takes in 0V and ...
1 vote
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### TimerBlox LTC6992 PWM variable clock generator at 2.3MHz... out of tolerance or used incorrectly?

The TimerBlox LTC6992 (https://www.analog.com/media/en/technical-documentation/data-sheets/LTC6992-1-6992-2-6992-3-6992-4.pdf) is a PWM chip specified to have a master output frequency maximum of 1MHz,...
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1 vote
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### Back to back MOSFETs and current sensing

I am looking into a circuit which has to do the following. A square wave goes in and a square wave goes out. I need to measure the current of the outgoing side because it is likely that the the load ...
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126 views

### Use of coupling capacitors in transistor biasing

I'm trying to use oscillator circuit to switch on the MOSFET and using coupling capacitors to isolate the DC biasing. Below is my circuit and graph I'm not able to understand the DC biasing here. ...
148 views

### Generate Square Wave with Fast Rise Time for Testing

I'm looking to economically generate a 1-2 GHz (configurable) Square Wave with a rise time of 200ps (or faster) to test the performance of various active scope probe designs. I don't need to be able ...
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68 views

### LFO Triangle to Square wave peak distortion

I put together an LFO based off the one in the link below. I swapped out the op amps in the schematic for 741 op amps. Everything works fine, except for the square wave. This is supposed to be the ...
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### Output a pulsing signal when input is high/low

So I have a proprietary system that outputs high when there is an error, and low when there's not. I want to put this signal onto a D flip-flop clock, so that if theres an error, my system clocks a ...
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2k views

### Phase shift a square wave

I have an application where I would like to derive a secondary square wave from a primary one but with a continuously variable phase shift. I would like to know if this is possible to achieve in a ...
1 vote
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### How can I use a square wave to interleave 2 LEDs with an arduino?

I have a PCB that drives a camera. I want to flash 2 LEDs in time with the camera's framerate using an Arduino. After some examination I found a CLK pin on the PCB that I think might correspond to the ...
3k views

### Why can a square wave (or digital signal) be transmitted directly through wired cable but not wireless?

Like ethernet cable, optical fiber. We have a square wave signal, do we just send that squre-wave signal directly down along the cable? If we do send it directly, why we can not send the square-wave ...
482 views

### How can I explain the unexpected negative voltage in the output signal obtained from half wave rectifier?

I observed the output signal of half-wave rectifier sending sine wave and square wave for an experiment. The rectifier was built with a 1N 4001 diode and a 100 ohm resistor. The output signal across ...
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753 views

### What is the reason the output signal I obtained from full-wave bridge rectifier has changing amplitude?

I observed the output signal of full-wave bridge rectifier sending sine wave and square wave for an experiment. In both of the output signals it is clear that each cycle shows one of the two different ...
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89 views

### Square wave from high voltage power supply (5kV)

I working on a project involving dielectric elastomer actuators and need to generate a square wave from a 5kV power supply (SRS PS350). The operating frequency will be 0-50Hz. What's one circuit I ...
98 views

### Obtaining frequency of 550 Hz from Simple Triangle and Square Waveform Generator Circuit

First time asking a question so sorry if I miss some things. I'll try to be thorough and straightforward. I'm trying to design a square wave from a triangle wave-square wave generator circuit. The ...
161 views

### How do a generate a clean, precise pulse wave electronically without jitter?

I am trying to build a simple pulse generator circuit for electrophysiological stimulation purposes. It seems to be surprisingly difficult to generate a square/ pulse waveform where the pulses have ...
123 views

### How to improve a high frequency square wave for laser imaging

I am trying to create a current source for laser direct imaging and I have a problem in the circuit I cannot solve. The laser is a 120 mW 405nm diode and I use it in a laser module from a laser ...
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1 vote
1k views

### High Frequency Square Wave Generator

I want to generate square wave but there are some challenges. Rise time should be less than 2ns as well as fall time (for 0V to 5V). Duty cycle is not so important it should stay high like 40 ns. I am ...
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467 views

### Rise time of 6N136 opto-coupler

I am trying to use below circuit for convert 24VDC high speed pulse to 5VDC pulse that can interface to a stepper driver IC. I have used 6N136 opto-coupler and according to its datasheet it can handle ...
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### Precision amplitude 600kHz square wave generator

I'm looking for a circuit that creates a precision amplitude square wave of 600kHz (50% duty cycle). The amplitude of the square wave needs to be 3Vpk-pk +/-10mV, but can be DC offset. The output of ...
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1 vote
241 views

### Using LC oscillator to create square wave AC [closed]

A full wave bridge inverter lookslike this: simulate this circuit – Schematic created using CircuitLab However this isn't practical because we have turn on/off the pairs of switches every time ...
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### how to give dc offset to the square wave from 2.5 v to -2.5 to 5 to 0 volt?

a)I want to change my square wave signal from -2.5 to 2.5 volt to 5 volts to 0 volts? actually this will be given to MOSFET driver ir2110. b) In the first picture, it is my original square wave coming ...
888 views

### How do I calculate the root mean square voltage of a square wave (with drawing)?

I need to find the root mean square voltage based on this drawing, knowing that the period (T) is equal to 6 seconds, and the voltage (V) is equal to 14 Volt. I know that the rms can be calculated ...
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846 views

### Square wave oscillator on PSpice simulation

I'm new to PSpice and here I was trying to simulate a square wave oscillator using a LM193 on PSpice. Here is the circuit that I've created there: Edit: The capacitor C1 has an IC set to 0 However, ...
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### How to convert any periodic signal to a square wave signal using the Schmitt Trigger?

I had to make a kind of frequency meter, and what made me stuck was the signal formatting. I couldn’t build a circuit containing the Schmitt Trigger, which will allow me to convert any periodic signal ...
1 vote
47 views

### how to tune wave to obtain a specific harmonic seriers

I wanted to know what is the relationship between a square wave and its harmonics, in other words can i change a square wave features (frequency, duty cycle etc) to obtained a desired fundamental ...
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### How do I amplify a square wave pulse of 4 to 8 periods at 3.5 MHz from +-2V to +-60V or more?

I am working with ultrasound sensors optimized for 3.5 MHz signals, and I want to test these using my PicoScope 5000 with integrated signal generator. The PicoScope is able to generate arbitrary ...
284 views

### Weak signal via pull-up resistor?

I am trying to trigger a camera from another primary camera. The circuit diagram provided is as follows: The signal to the input is supposed to be a positive square wave. So 0 V and a peak to peak of ...
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### Modelling a low-pass filter on LTSpice to filter an input square wave at 50kHz to obtain a sinusoidal output at 50Hz

I'm trying to create a filter that filters the output of an inverter at 50kHz PWM (from reading the comments, I'm not sure if I should be calling this the switching freq?) to a sinusoidal one at 50Hz ...
1 vote
133 views

### Scope says 59.9 Hz .. yet I can't measure turntable speed

I needed to measure a turntable's number of revolutions per minute, but didn't have any incandescent lamps around. So I rigged an LED to an ESP8266 SOC and programmed it with delays to output a 60hz ...
1 vote
48 views

### My Square Wave from my PIC24F got twice the intended period

I am doing a program where I am toggling an LED at a PIC24F Development Board an Explorer 16/32 development board with a PIC24FJ1024GB610 microcontroller attached to it. Explorer 16/32 got an LED (D3)...
1 vote
329 views

### Does this circuit convert sinewaves to square waves?

As part of a graded assignment on diodes, I was given this question. I ended up designing this circuit :- simulate this circuit – Schematic created using CircuitLab However, I only got ...
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### Understanding RLC series circuit fed with a square wave

I'm simulating a RLC series circuit fed with a 60Hz 3.3V square wave coming from a microcontroller. The inductor series resistor is 100 ohms, so the total R= 110 ohms. According to the simulation, the ...
1 vote
409 views

### What is the maximum frequency of CMOS level triangle wave?

What is the maximum frequency of CMOS (3.3V) level triangle (or square) wave that I can achieve with serial discrete ICs (for example: discrete PLL or DAC + OpAmp cascade)?
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### How to find the Fourier series of an output given input and transfer function

I have an input rectangle pulse, $f(t) = rect(t/\tau)$ and a transmission line whose transfer function depends on frequency. The transfer function of the t.l. is the transmitted wave divided by the ...
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### Generating 40 kHz square wave using ATtiny13

I'm using an ATtiny13 running at 1.2 MHz and would like to generate a 40 kHz square wave on PB3 and PB4. The signal on PB4 should be 180 degrees offset (inverted) from PB3. I know that I need to set ...
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1k views

### Converting a square wave into a sine wave

I have been researching methods for converting a square wave into a sine wave, but I cannot seem to reach a conclusion. Is it possible to preserve the amplitude and frequency of a square wave when ...
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### How to remove DC offset (and make average DC value 0V) from ADS1261 square wave AC-excitation circuit

I am attempting to remove the DC offset from the 1 kHz, ± 2.5 V, AC square wave output pins of an ADS1261 (http://www.ti.com/lit/ds/symlink/ads1261.pdf). However, when measured on the oscilloscope (...
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### Non-sinusoidal waveforms: relationship (resistance, capacitance)$\xrightarrow{\text{affects}}$ (amplitude, frequency)

During the laboratory we have analyzed the following two non-sinusoidal generators: square-wave generator triangular-wave generator Sadly we didn't have enough time to complete the last task. My ...
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### Logic-level square wave to transformer

I try to power EL wire at a chosen frequency. For this I have a microcontroller generating a square wave signal at the given frequency; this signal oscillates between 0 and 3.7V and the current is ...
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