Questions tagged [circuit-design]

a term to describe how a circuit should behaved based on accomplishing a particular task. When designing circuits, one should consider how it works, the target specifications, efficiency, cost effective, code compliant, and ethics.

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1answer
39 views

voltage spiking due to strong gate driver

If I make the PWM signal to gate very steep ( with rising time tr is very small like 200ps) then at rising time the gate ...
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1answer
32 views

Building a voltage adjuster circuit

I've been trying to build an op amp circuit that takes an analog signal from my electric guitar of around -1.5 to 1.5 V to a voltage level of 0 to 5 V, so that I can put it into the ADC of a ...
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31 views

Trying to create a 555 timer but nothing shows up in my transient analysis

I'm trying to learn more about 555 timers but my transient analysis renders me this empty graph. Is there something wrong with the way I am setting up my MultiSim Circuit?
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0answers
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Common Gate Transimpedance Amplifier Transfer Function

I am trying to find the transfer function of the common gate transimpedance amplifier. The transfer function that I got is different than the one at the original publication even though it leads to ...
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1answer
43 views

Trying to design a single op-amp oscillator

I am trying to build this single op-amp oscillator in Multisim but I keep getting this flat transient analysis. Is this what I am supposed to get? Am I using the wrong op-amp?
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1answer
29 views

Current Starved inverter with current sources connected to Vout node

The figure a is the conventional Current Starved inverter with M1 and M2 acting as current ...
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0answers
15 views

Replacing an analog pot with a digi pot in a flying drone controller

I'm working on a project at the moment and I'm supposed to change the analog pot on the controller with a digi one. My question is does installing the digi pot changes anything in the controller ...
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44 views

ATmega328p Motor circuit resetting the controller

I've made a circuit to run 5V DC motor via ATmega328p micro controller GPIO as shown below.whenever there is a connection to 5V DC motor, and if it tries to actuate the motor, micro controller will ...
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3answers
54 views

For an opamp configured as a unity-gain buffer, should its output DC level follow input DC level?

In an opamp configurated as a unity-gain buffer, output voltage amplitude and input voltage amplitude should ideally be equal. However should the output DC level be equal to input DC level as well? ...
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1answer
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Issue with circuit board implementing temperature circuit

I have not got a lot of experience with PCBs, but I have moved a breadboard circuit to a PCB and I am seeing an issue. The objective of the board is to sense temperature. When the circuit is on the ...
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1answer
91 views

How to create a cycling clock circuit from scratch?

I'm thinking about doing a project where I have basic components (hex inverter chips, breadboards, jumper wires, transistors, capacitors, etc.) and I create a simple computer. I've been trying to ...
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2answers
34 views

Gilbert cell gain polarity

In Razavi's Design of Analog CMOS Integrated Circuits (page 126 in second edition), he presents two variations of the Gilbert cell, one were the control voltage is applied to tail current sources (...
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3answers
61 views

Summing Amplifier - Resistor at non-inverting input terminal

This signal conditional circuit outputs the sum of five 76Ohm output sensors in the 10mV range and the voltage gains are 10,15,20,25,30. Could someone please explain to me why do we need a resistor at ...
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0answers
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Schmitt Trigger voltage divider

Could someone please explain to me when and why should we add a voltage divider at the inverting input of a Schmidtt Trigger?
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1answer
85 views

Trying to increase resolution of ADC using an op-amp

We currently have a circuit measuring a thermistor in a water tank, passing through a couple of voltage dividers and then plugging into an 12bit ADC which eventually interacts with a microcontroller ...
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2answers
98 views

SMD vs. THT Difference [closed]

I want to know the difference between surface mount device and through hole components other than the mounting style. Differences such as if the through hole counterpart of the surface mount device ...
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1answer
47 views

How to create a circuit which is sensitive to inputs change and results to output change? [closed]

Suppose that we need a circuit with 4 inputs A0-A3 and 1 output out. when one of the inputs changes (for example ...
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0answers
38 views

Ce stage amplifier

I wanna design a ce stage amplifier with this specification : Gain 20 Rc=10k Max swing The simiulation of the circuit is not the same with may calculations, How can i solve this? what i get from ...
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2answers
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24 V transistor switch acting strangely

I am working on a project to switch a spring-applied brake (datasheet, page 84, MCNB 2GR) using a Teensy 3.5. I only have limited electronics knowledge and am struggling with weird behaviour from the ...
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2answers
61 views

Do class D headphone amplifier ICs typically contain integrated step-down converters?

Headphones can range in impedance from 8 ohms to a couple hundred ohms, and many only require a few milliwatts. This means that - for a low impedance headphone - only a few hundred mV RMS will be ...
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1answer
782 views

Why does PCB copper surface oxidize when I apply flux on its surface?

I had to create a printed circuit board for a project, using the home method (PCB developer solution, iron chloride). At first, after the pcb was corroded, I cleaned it very well using paper towels ...
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1answer
33 views

LTspice on mac, how to specify value for a dependent voltage source?

I am completely new to LTSpice. I am trying to build this circuit in LTSpice on mac. The first problem I notice is that I can't rotate the components. I googled for a while and only found solutions to ...
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3answers
98 views

Designing a filter: does the order i which we cascade the sections matter?

So I am designing a 4th order lowpass filter using two biquadratic sections. I decided to split the gain evenly between both sections. After some calculations, one of the sections has a quality factor ...
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1answer
34 views

Design circuits with unused inputs or has a constant expression

I just started to learn about circuits design (without any prior experience), as a result I would like to ask a question. I was given a truth table for a circuit that has three inputs, and I need to ...
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1answer
32 views

Circuit design for triggering multiple optocouplers at constant voltage level

I have theoretical understanding of general electronics basics, however I do not have any practical experience in circuit design. Therefore I need some advice of what would be the best practice on how ...
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0answers
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How can I find the step response of an opamp with capacitive feedback network? [duplicate]

Here is an opamp with capacitive feedback. I used the following schematic to find the step response The applied step is 1V. The response at the output is as follows: The output can only go up to ...
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2answers
49 views

How can I break the loop and test the loop gain for a capacitive opamp?

Here is an opamp with a capacitive feedback network I have tried two methods to break the loop and obtain the frequency response for the loop. Method 1 Use a large inductor to break the loop at high ...
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3answers
63 views

Get an anemometer to activate a solenoid bolt and as low-tech as possible

To all you bright minds out there I have a project where I would like to stop a large outdoor wooden turntable from moving in moderate to high wind. The idea is to buy an anemometer off eBay that has ...
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0answers
30 views

Design a circuit to determine NMOS parameters

I am studying electronics independently, so this question is perhaps obvious for an engineering student. I know that, for the ALD1106 MOSFET, we can assume a typical \$V_t = 0.7 V\$. How could I ...
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0answers
30 views

Fencing Sport practise circuit

I would like to build a (my guess is a pretty simple) circuit to help training with the foil weapon in 'Olympic Fencing'. The electronic foil blade has a two wire socket to connect the electric ...
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2answers
73 views

What could cause a relay not to release immediately? [duplicate]

I have got a relay that doesn't release immediately after power is cut off. What could be the possible causes of this?
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1answer
45 views

Initial value generator in a circuit (Anfangswertgenerator)

I am preparing for my electrical engineering exam and I saw this in my script. I have this first circuit and the requirement is to draw the circuit in Laplace with initial value generator where t > ...
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3answers
80 views

How do I control multiple 4 pin LEDs with minimum GPIO pins?

I am using 42 four pin LEDs (common cathode) for my project, and I have to control them individually. I know we can use "WS2812b" for more effective usage, but 4 pin is a requirement in my ...
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1answer
50 views

Button is giving me the same voltage when pressed or released

I am doing a simple program with my PIC (PIC24FJ1024GB610). When a button is pressed the LED is turned on, when it is released LED is turned off. I presumed that the input pins have a pullup resistor ...
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1answer
34 views

Why does yosys mark used sub-modules as unused?

Question: Why does yosys mark used sub-modules as unused? Background: I am trying to find a rough estimate of the area of a circuit. Some years ago, during my bachelor's, I have used a synthesis tool. ...
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1answer
51 views

PIC microcontroller restarts command

I set my pic microcontroller (16f688) to energize a relay after 3 secs and to energize two more relays another 2 secs after. Problem is, sometimes, after it executes this command, it deenergizes the ...
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2answers
84 views

How can I make my flyback converter discharge immediately?

I'm using a flyback converter (220-100V to 19vdc) to power an electronics unit. But it doesn't discharge fast enough, this causes some relays to stay energised for a second or two after power supply ...
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6answers
5k views

Why would a circuit designer use parallel resistors?

I've been reviewing this reverse engineered schematic of a bmax6 style lipo charger. To my understanding this circuit is used to dissipate excess charge in a cell when balance charging. The circuit ...
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1answer
74 views

Figuring out what this circuit does

I need to understand this circuit (at least to a basic point). I know it's supposed to be a radio but I need to break into stages in my head to get what's happening. I am going to try to describe it ...
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0answers
49 views

Smallest voltage a peak circuit can detect

I have been looking up peak detector circuit in different sources but I could not find nowhere mentioning the smallest voltage a peak circuit can detect and what factors determine that value. In my ...
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2answers
48 views

How to cut the circuit when power is back, join otherwise

I have a fan which runs on 220V AC power supply. When the power is there, I use my air conditioner and don't use the fan. When the power trips, I want to turn on the Fan automatically using the ...
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1answer
35 views

Optimizing Simple Logical Design

I have a question about what looks to me like a non-minterm/maxterm minimization of a simple logical circuit. Sidenote: This seemed like the right place to ask this question, but let me know if there'...
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0answers
17 views

How to provide power to case fan and light bulb with RPi and relay?

I want to try to build a simple, straightforward RPi setup to control a incubator, and to provide a web interface to control it. Background--I'm a software girl, not really any experience with ...
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0answers
42 views

Detection of CT secondary subsidence current

In utility power system protection we have a protection function called "breaker failure" protection. This protection is used to take appropriate action if/when a circuit breaker fails to ...
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1answer
39 views

Difference Between B330, B330A and B330B?

What is the difference between B330, B330A, and B330B? I read the datasheets but I couldn't notice the difference. I want to use it as a freewheeling diode for a DC-DC converter with 12V input, 5V/4A ...
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1answer
96 views

Why does this cable have 3 wires to PCB on one side but only 2 wires on the other end? [closed]

I am working on a stereo receiver and was going to resolder some wiring. When I went to strip one wire on the 3-wire cable, the whole wire pulled out that was bare except for the half inch I was going ...
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2answers
72 views

I want to increase the speed of my 12v DC trolling motor

This has been a project I have wanted to do for some time now. I live on a large lake where gas engines are not allowed. I love to fish, but some of the best spots are a long boat ride from home ...
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3answers
108 views

LT Spice Project is taking too long

I am trying to implement a simple LT Spice circuit; it takes extremely long a 50ms simulation isn't settling even at 5 seconds. Tried adjusting the internal capacitances of the component, the AUX has ...
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1answer
32 views

High voltage circuit powering Arduino/ESP32 - requesting feedback?

I have been struggling with this for days...This is the first time using switched power supply units to power an Arduino. Can you tell me if this is wired correctly? If not, what needs to be fixed?
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2answers
92 views

Inconsistent voltage on buck converter (TPS54240)

I'm currently facing a weird issue. For one of my project I had to design a buck converter circuit in order to step down the voltage of three LiIon batteries to 3.3V so I can power a microcontroller. ...

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