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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22 views

Designing a differentiator op amp with a maximum voltage gain and gain limiting frequency

Hi I am required to design a differentiator for a project which requires a maximum voltage gain of 22 and a gain limiting frequency of 30kHz. Heres my progress so far: If im not mistaken (correct me ...
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79 views

Is the Art of Electronics still a very recommended book? [closed]

I am about to buy the book, but given its price I would like to know whether it is still a "must have" when learning electronics. Is it true that engineers use/need it even after graduation?
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43 views

Getting the wrong voltage while simulating a 555 timer

I'm designing a circuit based on the 555 timer. I'm using EasyEda as simulator. The problem I'm having is that, with a voltage supply of 5V, I'm getting 3.3V in the output, while I was expecting 4.4V ...
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2answers
43 views

Add a buzzer to a low current LED

The attached circuit works fine. The LED turns ON when SENSE PROBE and GROUND PROBE are NOT attached. The circuit is fed by a 5V battery. Somehow, the LED is not bright enough to begin with, but I ...
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24 views

Wiring DH48-S timer to be self-latching

I am trying to wire a DH48-S timer to operate a three phase pump. I have a remote controller/relay for the pump which is located about 1 km from my house. The remote controller can be configured to ...
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2answers
76 views

Choose and protect NPN transistor with resistor and diode

I'm working on my first circuit, controlling closet fans with an ESP32. I did some research drew the following circuit. I control the flow to GND from a 5V USB power supply with the GPIO pin thorugh ...
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2answers
94 views

What kind of op-amp circuit is this?

I am trying to understand the circuit have shown below. As far as I tried, it seems a differential amplifier for me. So, I tried to solve it in the way we deal with DC signals. But I failed to solve ...
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2answers
49 views

Is this design feasible? Door-open warning light circuit with safety interlock switch and general SPDT relay on wall voltage (120VAC)

I am trying to design a very simple system for my workplace that turns on a warning beacon light when a swinging door is opened. My current thinking is to use a non-contact magnetic safety interlock ...
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1answer
42 views

Why is this Schotty diode breaking a PoE PD module board?

I've designed this simple circuit that uses a Silvertel AG9205 PoE PD module in order to extract 5.65V from the RPI PoE header pins. Here it's the schematic: In order to be careful, I've placed a ...
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1answer
37 views

WT2003S mp3 greeting card

I'm busy helping a friend with a project involving a cheap mp3 playback circuit based on the WT2003. The original design is based on an LDR which shorts an amplifier circuit and initiates playback, ...
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3answers
129 views

9v oscillator circuit that produces a frequency of 500 Hz

I am a gr 10 student that really has no idea what I am doing, however, I have made a circuit schematic and just need to know if it is right I guess.
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33 views

How to synchronise two signals using IRIG-B or with a clock signal

I have two oscillators in different rooms, connected to a central circuit, each giving me 100 kHz logic signals. I want to synchronise these two signals in the central circuit therefore I can account ...
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4answers
52 views

EMI Input filter in SMPS

While reading some application notes and standards about EMI Input filters, and from the fact that: Engineers are responsible for ensuring that a circuit can operate properly in the presence of ...
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1answer
76 views

Circuit design - How to fix power supply overheating and reduced performance?

Goal I'm trying to make a IOT radiator valve so I can manage the heating of every room in my house automatically with a system I'm building. Context I've pulled apart a cheap "smart" ...
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1answer
22 views

Using LCD and other modules with external regulated source and common ground

I am designing a circuit where I want to interface various modules with Arduino Mega. The way I want to do it is use an external regulated power source for the individual modules, instead of powering ...
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1answer
82 views

How do people estimate node voltage and branch current by observing a circuit?

The question might sound silly, but I hope experts can guide me on that particular issue. I am struggling for the last few months. I am a beginner in analog circuit design. When I follow a tutorial, I ...
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1answer
43 views

Overvoltage protection develops heat, is ok?

considering my old question: Here, i've made the following circuit using equivalent components on SMD, here is the schematic: And these are the parts that i've picked from LCSC: Fuse: Link here ...
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3answers
163 views

Recommendations on any working circuit that has at least 20 components

I am currently a computer engineering student taking up basic electronics course. Right now we are learning how to etch a circuit on a PCB and our required output is to design a PCB layout for a ...
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1answer
68 views

Precision reference voltage: buffering with OpAmp and BJT

I'm designing a reference voltage generator for the analog section of a circuit. Two voltages as needed: Vref = 3 V for ADC Vref/2 = 1.5 V for signal conditioning circuits (with a load of about 40mA) ...
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24 views

Confirming validity of schematic for dual stepper motor PCB

I'm trying to make my first schematic for a PCB that would sit atop an RPI and allow for control of two stepper motors. I have an LM2576 to take 12v from the motor supply and step it down to 5v for ...
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2answers
36 views

Impulse relay functionality without latching

Let me start by declaring that I have absolutely no idea what I'm doing so please try to keep it simple if possible. Thanks in advance. I have a project requirement that uses simultaneous input from ...
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2answers
88 views

Inductor not working

I tried building a toroidal inductor with the following parameters: OD= 1.400 in / 35.55 mm +/- 0.75 mm ID = 0.900 in / 23.0 mm +/- 0.55 mm Ht = 0.500 in / 12.7 mm +/- 0.50 mm Wire: solid insulated ...
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1answer
44 views

digital feedback stability

Good evening. i confused to extract the transfer function of the following loop, (shown below) where Cin is a switch cap operated by feedback Fout and Cx switch cap is operated by an external Fref = ...
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70 views

Automatic power source selection circuit

I'm working on a project consisting of an ESP32 development board and a breakout PCB. I'd like the project to operate both with and without a USB cable connected to the ESP32. The ESP32 has an on-...
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38 views

is it possible for the phase difference between voltage and current to exceed pi/2 in a RL circuit?

I did an experiment where I made a RL circuit. My IV was resistance and DV was phase difference between voltage and current. To find the phase difference, I took the difference (Δt) between time when ...
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43 views

Why is this small signal model incorrect?

Here is the model I was told to redraw by replacing the transistors with their mid frequency small signal model: And here is my attempt at doing so: Upon receiving feedback, I was informed that the ...
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40 views

can fourier transform be used in circuit design?

If I formulize the input voltage that I am planning to give to a circuit and if I formulize relative output voltage that I expect to see with respect to input voltage, I can take their fourier ...
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39 views

12V stepdown to 3V [duplicate]

I know the Formula V=IR. Many years ago I had a sony walkman. This unit ran on 2AA batteries and the label said it used 200ma. I wanted to hook it up to my car. 12VDC I attempted to build ...
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27 views

Raspberry PI LED calendar project. First steps with a circuit

I need help with the project in several ways: Design circuit Calculate resistors Calculate power supply I started it thinking that it would be something simple (turning LEDs off and on), but it ...
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1answer
48 views

EMI/EMC Simulation using SMPS Software

Assuming I have a complete SMPS simulating circuit using Simplis/Simetrix simulator and all the AC and transient specifications are met. How can I perform an EMI/EMC simulation test using this ...
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2answers
63 views

Playing a sound when turning off a circuit

For my project, I am looking to have this (mock-up) circuit play a sound, e.g. the Windows XP shutdown sound, the moment it is powered off. I have looked at capacitors, relays, opto-couplers, and a ...
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1answer
59 views

Power factor controller selection

I would like to design a power supply to a micro-controller based system that will need a 12V as Vin and 6A to feed the whole circuit. The system is expected to be an alarm small equipment. It is ...
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2answers
49 views

Circuit simulation for audio equalizer not working need help debugging

For a personal project I was designing a basic audio equalizer circuit using this online simulation tool called TinkerCad. I managed to build the circuit but for some reason I really can't get it to ...
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4answers
67 views

Starting sequence in PFC AND SMPS Design

In the design of power supplies, we often use Active PFC and downstrem SMPS, to regulate the output voltage, and we often use IC controllers like MC33262 for PFCs and NCP1252 for AC-DC converters. ...
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1answer
58 views

Opamp gain issue

I am designing a circuit which has gains of 1, 2, and 3 respectively using a TL084 - which is a quad channel amplifier. Yesterday I was getting stray voltages but I resolved it with pull down ...
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1answer
57 views

Envelope detector and distortions

I am attempting to design an envelope detector, however, I'm having problems with regards to diagonal clipping and negative peak clipping of a certain input. While trying to follow this video's ...
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2answers
126 views

Very basic circuit question

My problem is in the VA, VB parts is the previous circuit equivalent to this (OPTION A): Or to this (OPTION B):
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2answers
93 views

Opamp Design Considerations

Opamps are a great device for amplification. Recently i used a TL084 which is quad-channel Opamp I used three opamps in the device for getting gains of 1 , 2 , 3 respectively. I noticed that, without ...
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1answer
135 views

Is this circuit possible?

I am making an electrical circuit for a school project, yet electrical engineering skills cease after Ohm's law :) Now I did some research but I find electric circuits harder to design than I had ...
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1answer
67 views

Momentary switch on-off circuit

I am trying to create a circuit to allow me to switch a project on and off with the activation of a momentary switch (a momentary push button or reed switch, for example), but I'm coming up blank and ...
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1answer
33 views

Determine voltage regulators for a circuit

I'm trying to determine if the switching voltage regulators I want to use in my circuit are suitable. I want to use the regulators to change a 50V line into a 5V line that supports motors. The motor ...
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0answers
47 views

MC34063A: Problem with obtaining step-up performance

I am working with a MC34063A voltage regulator in order to prototype step-up power management solution, with control logic to switch between three different output values. I encountered some issues ...
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2answers
148 views

I need to know what the circuit does where there are 4 resistors in parallel, two capacitors and two diodes with cross links

I'd like to know what the circuit in which include 4 resistors, two capacitors and two diodes would do independently from the rest of the circuit if it was connected by itself to a voltage source at ...
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2answers
48 views

How do I switch over between 2 AC power supplies with circuit breakers

I once saw a diagram where a house was supplied by a generator or from the grid by using 3 trip switches only. It must be manual so I can select as preferred, and not a automatic system. I also prefer ...
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1answer
201 views

Reason of using a resistor parallel with NTC at mains input

I have a SMPS circuit. There is a serie connected NTC at Neutral input. I know NTC is used for inrush current limiting purposes. But there is a 20ohm 2W resistor which is parallel this NTC and I don't ...
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209 views

Why is it easier to implement bytes as 8 bits rather than 9 bits? [duplicate]

From book to book I always find the same sentence. For example: 8 bits is an even power of 2, which makes it somewhat easier to design computer hardware with 8-bit bytes than with 9-bit bytes. ...
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1answer
65 views

How can I solve these Verilog questions? [closed]

I am new to Verilog Language. I did answer the questions below but I am not sure if my answers are correct. I would appreciate verification to my answers and any feedback if I am wrong. Also, if 3rd ...
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1answer
42 views

Correct way to wire a 5V relay using BC547

i am trying a relay circuit. I saw one diagram online in google images and another one when i actually test. Here are the two diagrams: Diagram 1 This one i tried but not worked for me. But its a ...
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1answer
38 views

Reason for using generally TH type current sense resistors in SMPS circuits

I'm investigating SMPS circuits and I'm trying to design my own. In my design, I have a 300mOhm current sense resistor and its power rating must be minimum 177mW so I need a 500mW resistor. I have ...
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1answer
54 views

Controlling a power supply with a MOSFET

I'm making a circuit that will have a main part (up to 5A load) in a back box, mostly unreachable, and a control panel at the front. I want to have a kill switch at the front panel, so that I won't ...

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