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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Finding all hazards in a small MIPS program

I have the following MIPS program: bne $zero, $zero, Label add $t2, $t3, $t4 add $t5, $t2, $t4 lw $t2, 0($t4) Label: add $t5, $t2, $t2 ...
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60 views

How does an op-amp work without proper power supply?

I have built a chua's circuit following this diagram: Source: Kennedy 92(pdf). The rectangle inside NR is and eight pin dual opamp. Then, I remove the 9V battery on the right. It is replaced by a ...
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21 views

How to develop Differential Conductance dI/dV measurement setup?

I have a Lock-in as sinusoidal Voltage source, DC Current source and Multimeter. Can you please help me to develop a functional setup for dI/dV measurements. How can I design the circuit? What ...
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52 views

BCD to Grey Code converter [on hold]

Design a Binary Coded Decimal (BCD) to Grey code converter. The 4-bit Gray code output should be displayed on 4 LEDs {D3,D2,D1,D0}. The 5-bit BCD input is provided using 5 switches {A,B,C,D,E}. So, I'...
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4answers
59 views

Momentary Over-Excitation Voltage Circuit

I want to control an electromagnetic brake (fail-safe brake) used along with servo motor. Microcontroller will control the trigger signal for the electromagnet coil. Electromagnet Requirements: ...
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1answer
51 views

Building a formula to pass n bits though the minimum number of circuts

I have a circuit X which has 4 inputs A0,B0,A1,B1 and 2 ...
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3answers
103 views

How to split audio signal into 3 separate channels?

I have been working with the following circuit: to build a audio mixer where you can take multiple line inputs, cd players, computer, phone, synthesizers, etc... and mix them together to a single ...
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1answer
63 views

What components would I need to build a basic circuit that completes when something is pulled with a certain amount of force?

As an example, a rope tied to a tree when pulled with Y newtons would illuminate an LED but wouldn't when only pulled with X newtons. I guess what I'm looking for is a basic force meter.
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1answer
30 views

Relative difficulty between leading zero counting and addition

Consider a 32-bit or 64-bit ALU that must implement both count leading zeros and integer addition, with low latency (say a few cycles), implemented on a modern high frequency logic process. Which is ...
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42 views

Can I represent this circuit like this

I want to do even-odd mode analysis, is representation of the circuit as shown below correct? Are these two circuits equivalent. Z is the characteristic impedances and theta are the electrical length ...
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0answers
35 views

Chua's circuit's equilibrium at \$x=y=z=0\$

The Chua's circuit satisfies the differential equations from Wikipedia. Clearly, \$x=y=z=0\$ is a solution, but not the solution we see when double scroll appears. Since at \$t=0\$ when we switch on ...
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1answer
49 views

Help Identifying Parts of a Battery Management Board

I am currently way over my head in a personal project to design and create a 5 cell battery protection system. I'm fairly confident that I've correctly cloned the cell balancing section (section C) of ...
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1answer
53 views

Can't update my schematic to PCB layout in Altium

I have finished my schematic for an echo circuit using PT2399 IC as per the application circuit in datasheet. I have downloaded the part (including footprint) from snapeda.com and updated my Altium ...
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2answers
108 views

LTspice: Simulating a Van Der Pol Oscillator

I am trying to simulate the oscillator with an RLC circuit with the initial condition V(V1) = 0 and D(V(V1)) = 0. Since LTspice does not allow initial condition with time derivatives, I set the ...
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2answers
50 views

Touch switch with conductive ink as thin as possible

First for all. Am not an electrical enginner, am just an amateur artisan, pretending make intetesting gadgets. So the situation is this. I need to make a circuit in a sheet of paper for just turn on ...
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80 views

High-frequency (up to 1 MHz) voltage (RMS) sensor

I want to measure RMS voltage at around 1 MHz using an MCU. The frequency will be fixed and known. Voltage waveform is very close to sinusoidal and the expected measurement accuracy is better than 5%. ...
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1answer
21 views

LTspice: Including Time Derivative of a Node Voltage in Initial Condition

I am trying to simulate an RLC circuit with the initial condition that V1(0)=2 and V1'(0)=0. I used D(V(V1))=0 in my spice directive, but I don't think the condition on time derivative has actually ...
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2answers
82 views

Converting 400 to 500 mV signal to 0 to 10 V PWM signal

I want to make a driver board for piezo mist maker which requires 10V 1.7MHz signal. So far I have created a signal of 1.7MHz and 0.4 to 0.5V (picture link added) with a crystal oscillator and 2 PNP ...
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1answer
68 views

How to work out this implementation of chua's diode?

The author of a book claims that this is the implementation of Chua's diode by [Kennedy, 1992], although I cannot find this article. My question here is, how does this circuit work? For me, the ...
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1answer
39 views

Signal low delay for specific amount of time / hardware - equivalent of Arduino pulseIn() function

I have a circuit similar to the following: (Source: electronicsforu.com - Shadow Alarm: Light Sensitive Circuit) In the circuit, the output from op-amp pin 6 goes low when a shadow falls or light is ...
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20 views

How can I make my own USB Joystick Encoder PCB and my own program which allows me to easily edit what the buttons do on a PC [duplicate]

I have previously used an Arduino Pro Micro to make button boxes for my computer which do functions such as type my password or copy something. I was wondering how I would design my own PCB which does ...
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2answers
85 views

Help With Buffer Amplifier/Filter Type Circuit

I’m having trouble with a circuit I designed and I would be greatly appreciative if I can get some help here. The circuit I designed is a buffer amplifier type design intended to take two channels of ...
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1answer
71 views

How do I build a USB joystick/button encoder board without using an Arduino or Teensy [closed]

I am making a macro keys button box and need something to convert the buttons into keyboard inputs on a PC, such as a shortcut key in a game. Previously I have used an Arduino Pro Micro, although in ...
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1answer
59 views

Newbie questions: Calculating the time to discharge for a capacitor

I am looking to charge a capacitor using a simple DC power supply. however, I was curious how I could calculate the time until my capacitors would discharge. Also, would an inductor placed in series ...
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2answers
49 views

Can two lights be switched between without an “ON-ON” switch?

The schematic above shows our problem. We need to be able to turn on light A when a switch connected to light A is closed and then turn on light B when the switch is open. There are a few ...
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2answers
126 views

Is the 100 ohm resistor needed in this mains power supply?

Do I need the 100 ohm resistor in the below circuit? Is there any problem if I don't use it?
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5answers
169 views

Resistor & capacitor are getting too hot

I made a transformarless power supply with capacitor. When i connect it on ac, it light the leds. But after some second the 100ohm resistor and 470uf capacitor get too hot. Its too hot that i could ...
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2answers
60 views

LED Circuit - Resistor calculation

If I have an LED such as this It has a forward current of 20mA It has a forward voltage of 2V. If my supply is 3.3v, am I correct in saying I would need a resistor value of 65 Ohms. My calculation ...
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1answer
125 views

Circuit: Balanced Gray code => Binary?

I've designed a circuit that accepts a standard gray code as an input and converts to binary. However, I am needing to perform the same conversion (to binary), but with a balanced gray code as the ...
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1answer
60 views

A 4bit counter that goes up and down

I am kinda new to the website, I just came across it after looking for answers for such a long time. I have an assignment that asks to add an input bit to your circuit from the circuit I created that ...
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1answer
75 views

Working principle of the AD8232 high pass filter

This is the datasheet of the AD8232. On page 22 in the section "Additional High-Pass Filtering Options" is this diagram: It is said that the cut off frequency is located at I tried to find out ...
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3answers
40 views

How to make a differential measurement using two single-ended circuits that are high-z isolated?

Consider this system: There is an AC source that is differential w.r.t to ground. To measure this signal, I setup a diff-buffer and then feed the output to an ADC which measures the differential ...
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1answer
51 views

control a resistor connection in the circuit

I am trying to use a function on a charging chip where disconnecting(floating) a pin usually connected through a resistor to ground, disables charging (datasheet, section 10.3.8). In the default ...
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0answers
38 views

Designing a two stage differential amplifier with MOSFETS

As a part of a "Test you understanding quiz" i had yesterday at school were we tested our understanding of differential amplifiers and mosfets i came across a question that asked us to design a ...
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3answers
53 views

Infrared Receiver - Simple questions regarding data sheet and basic electronics

I've purchased a 36 kHz IR receiver (TSOP38436) but I'm still learning about electronics and I'm not sure how to connect this to my micro controller (Arduino). (Also, I'm using 36 kHz instead of the ...
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1answer
78 views

Build a circuit so that you can determine the I-V curve of a diode

The question I have is: how can I design a circuit so that I can determine the I-V curve of a diode. I've found this one: But is that a smart circuit or can I find a better one? Thanks for any ...
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0answers
37 views

Guitar to iPhone JFET pre-amp circuit issue

I am following this tutorial to build a simple JFET pre-amp to connect a guitar to an iphone. This is the schematic: I have soldered the components as per the schematic directly onto the 1/4" mono ...
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1answer
70 views

Using an IR diode as an emitter and receiver?

At the recent Maker Faire Berlin, I was told that LEDs can be repurposed as photo diodes. I assume the same is true in the infrared range. This sounds like a nice solution for building a transmitter. ...
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2answers
66 views

Can we prepare any ICs similar to decoder or demux , but for selecting multiple pins simultaneously?

It is possible to select the output pins sequentially using decoder or demux. But for selecting more than 2 output pins at same time, they don't work as the decoder /demux are single output selector ...
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2answers
65 views

Which electrode is anode and which cathode in a plasma reactor with high-voltage DC power supply?

Which electrode is anode and which cathode in a set-up like this (plasma reactor)? Or, what is high-voltage sharp electrode - anode or cathode?
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2answers
63 views

Trouble getting measurments of my circuit

I'm trying to turn the first image in a multisim circuit but i can't get the right measurements. I have tried a vcc power source but i still can't get the right result in the oscilometer can anyone ...
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2answers
2k views

What does this circuit symbol mean? [duplicate]

I'm a student who is trying to build a wah pedal for a guitar. I came across this diagram for how to wire the circuit (from this site) : Within the diagram, I am not sure what the following symbol ...
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2answers
85 views

Detecting when an illuminated AC doorbell is pushed

I have an 8VAC (can be switched to 12VAC if required) pushbutton bell which is in series with two "ding dong" chimes. The button is illuminated with an incandescent bulb, also in series. Pushing the ...
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1answer
36 views

DPDT Switch Microcontroller

Is there a microcontroller equivalent of a DPDT Switch? I am trying to develop a product that requires remote reversal of polarity by incorporation some sort of an equivalent of the mechanism ...
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1answer
53 views

Combining power input and USB data port for a Raspberry Pi Zero (W)

I am attempting to design some peripheral circuit around a Raspberry Pi Zero W for a portable project. It will be powered by a lithium battery. I want to bring out the USB port of the Pi; I also ...
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1answer
60 views

Why polarize a differential pair with a diode-connected BJT?

I was having a look at the LM148-family design At the input stage, why would you polarize a differential pair with a diode-connected BJT? If I'm not mistaken, the output resistance is also going to ...
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26 views

Looking for circuit, reversing polarity of DC motor

Consider I have 2 inputs, A and B. I need help with a circuit that does the following if only A is active (A,B : 1,0), then the motor should run clockwise if only B is active (A,B : 0,1), then the ...
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2answers
76 views

Working Principle of AD8232 Instrumentation Amplifier

Before begin asking, here the datasheet for the IC https://www.analog.com/media/en/technical-documentation/data-sheets/AD8232.pdf At page 16 under Theory of Operation Section What I failed to ...
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1answer
67 views

Two state switch using transistor (bi-directional)

I have an existing pair of wires driving a servo motor. One of them is +12V, the other one 0V. Depending on the rotation direction of the motor, the voltage flips. I now want to put an optional ...
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26 views

How to design Micro SD circuit for different speed class?

It's my first time to design the micro SD reader circuit. I hope that my design can support micro SD card with various speed class(from class2 to class10). According to my understanding, the only ...