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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2answers
58 views

MOSFET based audio switch generates thumping sound

I need to switch on and off an audio signal without clicking or thumping. I have tried the below circuit that I designed and simulated in LTspice, but it generates a thumping sound when I wire it up ...
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0answers
30 views

Designing an Ethernet / RJ 45 disconnector

I am currently in need of a device that is plugged in between a host and a client to cut the connection regularly on a hardware level. This should simulate unplugging the Ethernet cable and plugging ...
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36 views

Can I use the circuit from an electric mosquito bat in a homemade 3'x3' panel?

SUMMARY: I'd like to take the control circuit out of four electronic mosquito bats and use them on a homemade panel version of the same thing. I know little about electronics, so my question is, ...
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82 views

Are there errors in the description of this circuit?

Background The circuit describes the operation of a variable voltage power supply. In the description below the circuit diagram there are errors. Read through the description and note down any errors....
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2answers
50 views

Recording bioelectrical activity in plants- will this circuit work- any advice on sensors?

I am a visual art student and I'm currently developing a project which involves recording bioelectrical activity in plants. I am totally new to this game so I’m just wondering if anyone can have a ...
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1answer
59 views

Design a timer circuit

I need a time circuit to switch off lamps(6 lamps of 16 watt each) after some time. Time should be adjustable(In secs like 30s or 90s).The lamps are fluorescent lamps. The circuit should also have a ...
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0answers
21 views

Mixing Symfonisk high/low-mid output channels

So i've been messing with this issue for a couple of months and it's just that my electronics knowledge isn't reaching far enough. I have a Symfonisk speaker by Ikea, which outputs a low and high/mid ...
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0answers
24 views

5 bit binary display in decimal to 2 7seg led [closed]

bit adder/subtracter circuit I used full adders to make it and got a max output of 5 bits(1110=30d) now, I need to show the output on 7 seg leds. Note that no micro controller or programmable device ...
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19 views

Problem with my tdcs device [closed]

I want to make a TDCS device and I found this circuit from this youtube video https://www.youtube.com/watch?v=2awq1WorsoA. The problem is when I connect a LED to the terminal the current is only 0.02 ...
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22 views

How to design a multiplexed keyboard circuit for Arduino?

Hi all, I'm working on a project where I'm trying to read my calculators keyboard to know which key was pressed. I've decided over the past few days that hooking into the calculators PCB wasn't ...
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1answer
43 views

Does 12 V DC to +6 VDC and -6VDC with discrete components require conversion to AC?

I have a 12 volt battery and want to power a 741 Op Amp, but that requires + and - voltage supplies. Is there a more efficient way to give a + and - supply to the op amp from the battery without ...
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4answers
83 views

How to make an IR proximity sensor work in daylight?

I am trying to make a touchless water tap using an IR proximity detector. I used a simple circuit: It works well inside room but it doesn't work in daylight. It remains active in sunlight and if I ...
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27 views

How do I realize the function using only 4:1 MUX and Inverters?

$$\begin{array}{ccccc} \hline \boldsymbol{a} & \boldsymbol{b} & \boldsymbol{c} & \boldsymbol{d} & \boldsymbol{f}(\boldsymbol{a}, \boldsymbol{b}, \boldsymbol{c}, \boldsymbol{d}) \\ \...
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63 views

circuit design to output high voltage at high frequency

I'm trying to design a circuit that outputs 4.5 KV alternating between two nodes at about 4Mhz. what would be the most efficient way of doing this. I thought of using 4 4.5KV rated transitors as in a ...
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15 views

High-Pass Filter Setup

In several designs I've come across the following setup. Design -> RC Network (High Pass) -> Oscilloscope Input: Where SK2 is the SMA connector from the PCB that goes into an oscilloscope. Some ...
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2answers
47 views

How to select RC time constant for giving PWM signal to ADC pin of controller?

PWM Freq : 30 HZ and 5% Duty cycle, uC internal ADC sampling time is configurable. any limitations with ADC sampling time & Duty cycle of PWM should be considered for choosing RC ?
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1answer
49 views

Which type of transistor (MOSFET or BJT) would be better to use for the longest battery life?

Background These two circuits will function as a broken loop warning device. Can think of this as a circuit that sets off an alarm when a loop of wire is cut. This cut wire could also represent a ...
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3answers
54 views

How do I speed up transistor switching in low side power switch?

I am working on a project and want to drive a motor with a 12V PWM signal (Motor connected to 12V and the Motor- net on the diagram). The circuit below is an idea I have, however after I built it, it ...
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1answer
49 views

How to use a sprinkler valve in multiple zones?

I am currently setting up an outside irrigation system. When I built the system, I thought the irrigation controller would allow me to power multiple zones at the same time, and that each valve - ...
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1answer
49 views

Formula derivation of Doherty power amplifier from circuit diagram

I'm having a hard time understanding how formulas are derived from the diagram of a simple Doherty power amplifier circuit, as pictured below. While I understand the concept behind load modulation ...
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2answers
61 views

I want to make the LED turn on only when it receives 0V after a timed 5V input

I am still a student and so this question might sound too easy to be asked here, for which I apologize. I want a circuit that consists of a single LED. When this LED recieves a 0V potential ...
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0answers
38 views

Draw a State Diagram

I've been struggling with this problem for awhile now and I need a state diagram before I can move on to the other steps. Please lmk if there is anything I can do to explain this problem. If somebody ...
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0answers
26 views

No PSpiceTemplate warning in PSpice

I am trying to simulate the following circuit in PSpice, but I face the this warning in base of the transistor. changing the transistor didn't solve this issue. Please help me fixing it! WARNING: [...
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0answers
39 views

Using interrupts with W65C02 and W65C22

I’m trying to use the interrupts of the 6502 and 6522. I want to read the value of PORTA whenever the “READY” line I have is HIGH. I think I understood that I have to put the “READY” line on CA1 and ...
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1answer
27 views

Minimize power consumption IR receiver

I am designing an embedded system where I need to minimize power consumption in standby mode (ideally no additional consumption from the IR receiver circuit when in standby) This system will be ...
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3answers
42 views

Circuit to generate few microvolt pulse signal from volts pulse signal

I need to create a circuit which converts a pulse to very low voltage pulse (micro volts). This circuit output goes to an amplifier circuit. Right now, I created a circuit using a voltage divider and ...
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1answer
75 views

How to get rid of floating voltage on Bridge rectifier

I'm trying to implement a rectifier and AC voltage sensor. The rectifier part works just fine. I'm able to power my device without any issues. Please look at C2 in the screenshot (Circuit schematic)....
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1answer
39 views

How to choose the transfer function?

Greetings from a physics student. I have to do an activity which aim is to design a filter in frequency. To do so, I need a transfer function (gain, poles and zeros) that must meet the following ...
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0answers
55 views

Pull-ups in a mixed voltage environment

I'm working on a circuit where a 12 VDC line is switched from a USB-powered microcontroller (U1, running at 3.3 V, specs below). I want to ensure that the switch ...
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0answers
26 views

What is the PAD size required for the Battery negative and Positive pads voltage (min 30v to max 42v) current (min 500 mA to max 15 A)?

I am creating a circuit for low voltage battery management systems (10s 1p 36v 2.5A battery pack). All the circuits is perfectly done from schematics to Layout. But i have small doubt in Battery ...
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1answer
113 views

Designing an EMP Generator for school :^)

How would I go about calculating and designing a circuit that can produce an axial magnetic field greater than 20 Tesla for about 1.4 μs (full width at half maximum). The dimensions of the solenoid ...
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1answer
40 views

Which is the acquisition time of the SAR ADC of a LPC1768?

i'm trying to design a RC filter to drive the ADC of the micro-controller LPC1768 and i need to know the acquisition time of it (which is not in the datasheet). I'm using this article as a design ...
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0answers
36 views

Circuit Simulation Error Proteus

I was recently working on a burglar alarm circuit design in Proteus 8 Professional. I have attached the circuit design below. The problem is when I am simulating the circuit, I am getting the ...
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0answers
41 views

Large signal vs small signal analysis of Differential amplifiers

Here is a question from the textbook "Design of Analog CMOS Integrated Circuits" (Razavi)- Assuming the circuit shown is symmetric, sketch Vout as (a) Vin1 and Vin2 vary differentially from zero to ...
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1answer
61 views

Designing a USB Selector Switch for a Printer and 2 PCs

I would like to build a circuit that allows me to use a single printer with both of my PCs. It is exactly something like this: Also, I would like to use this type of switch: in order to select ...
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0answers
73 views

how can i make a 5 bit binary display (hex2dec) sheet

hey guys i need help with hexadecimal to decimal conversion display for 5 bit number i can only do it for a 4 bit , since im using a 4bit binary adder ,please help me to do it for a 5 bits , here my ...
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0answers
44 views

Power circuit for a microprocessor

This is my first question here, and my english is not the best, so i am sorry if i miss some community rules :) I have a microprocessor MIMXRT1064DVL6A from NXP, and I am having a bad time figuring ...
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0answers
39 views

Realizing an XOR expression using NAND gates [duplicate]

I've been trying really hard to understand the construction of a logical circuit using only NAND while also trying to minimize the number of gates. The minimization of gates is what is really ...
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1answer
43 views

Help calculating the value of a smoothing capacitor

I prefix this with I know virtually zero about electronics, sorry. Preface In an attempt to try and gain some basic knowledge and learn a lower level programming language (usually work with more ...
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0answers
57 views

Open circuit test and short circuit test

The results I got are close to the required answer, but there is a question asking for drawing the open circuit and short circuit tests characteristics .. I tried to solve it, but Isc and Vt (in open ...
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1answer
32 views

Simulate Step down chopper circuit using any Electrical Engineering software

Here's my attempt: Could someone tell me where is my mistake ? Or simulate answer the question using any other software,please ?
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2answers
34 views

Effective differences between MAX485EESA+T and MAX485ESA+T?

Is anyone able to explain to me the effective difference between the MAX485EESA+T and the MAX485ESA+T? The datasheet points out that is more tolerant of ESD discharge up to 15kV, nothing more. Can ...
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2answers
66 views

Current mirror circuit across a MOSFET: Help needed in understanding the working

Below is the circuit in which a PNP Current mirror circuit is used to control a P- channel Mosfet. What is the intended operation of this circuit? V2 acts a power supply voltage for many devices ...
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1answer
48 views

Collpits FM Receiver

I saw this simple schematic for an FM receiver: https://www.mikroe.com/ebooks/radio-receivers-from-crystal-set-to-stereo/the-simplest-fm-receiver Moreover, I saw some videos online where people have ...
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2answers
98 views

Adjusting buck regulator with DAC

I have a buck regulator (say the TPS82085) which I would like to use to regulate a 5V supply to various values ranging from 1.2V to 3.3V. It seems that a DAC is a good way to do it (I initially ...
4
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1answer
85 views

Equation to calculate voltage divider resistor value for an input of op-amp

I found this guide for a temperature sensing circuit design with NTC thermistor by Texas Instruments. According to my opinion, optimum R1 value is calculated so that the voltage divider can provide ...
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2answers
55 views

DC Motor and Relay in series with each other

First off thank you for any comments or answers, I've been reading quite a bit on here and it's helped me a lot which is very much appreciated. Secondly, apologies if I've made any obvious mistakes / ...
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3answers
467 views

Fade in and out 12v LED strip

Is there any easy way to continuously, slowly fade (dim) in and out a couple (5 at most) 12v monochrome LEDs (5050)? A wild guess would involve a large capacitor (for the fades to be slow) and a ...
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2answers
48 views

Voltage drop from PCB ground plane to motor driver

I'm new to creating circuits but have designed a PCB and made it with Eagle, however, the BD6210F that I'm using doesn't want to allow me to run the motor due to the voltage only being input at 2.5v. ...

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