What is Circuit design: Definition and 97 Discussions

The process of circuit design can cover systems ranging from complex electronic systems all the way down to the individual transistors within an integrated circuit. For simple circuits the design process can often be done by one person without needing a planned or structured design process, but for more complex designs, teams of designers following a systematic approach with intelligently guided computer simulation are becoming increasingly common. In integrated circuit design automation, the term "circuit design" often refers to the step of the design cycle which outputs the schematics of the integrated circuit. Typically this is the step between logic design and physical design.

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  1. L

    Help Requested: Reverse Engineering PCB Layout to Circuit Design

    Dear All I have been recently started to work with Reverse Engineering technology and I would now like to determine a circuit layout diagram of a charge controller from its PCB Layout. Can anyone please help me with this one. I have uploaded the PCB design for your reference. Please...
  2. A

    Battery Monitor Chips and Circuit Design

    I'm looking at custom building a Li+ battery pack, six or seven cells, and want to design a battery monitoring circuit that measures voltage of each cell and keeps track of charge/discharge. The battery pack needs to fit in a form size of about 8" by 2" by 2" so my circuit should be fairly...
  3. D

    Simple alternatives protoboards for RF circuit design

    I've found out very quickly that I can't use a breadboard for RF circuits, what is another choice? I know PCB's would be best but making them is very tedious for me. I'm new at this stuff so I plan on experimenting quite a bit which is another reason I want something quick and easy to replace...
  4. J

    Circuit Design with Sensors-Your Advice Needed

    Hello everyone, I'm Jamie and at the moment I'm at the final stages of my final year design project. I'm designing a piece of exercise equipment that motivates children to exercise but have run into a bit of a problem with regards to the circuitry. The image above shows the finished...
  5. E

    Circuit design help, dual inputs

    Hey! New to the forums here, and I wonder if you guys could give me some help. I've got a problem! :D Problem: Let me give you the scenario. I've got some GPS equipment that runs on ignition, constant, and ground. I have a barge that has two motors, and two ignition switches. I need to power...
  6. S

    NiMH Battery Management System - Balancing Circuit Design

    I am working on a senior design project that is to design a battery management system to monitor NiMH batteries powering an electric truck. The professors who proposed the project set the main requirements to be that it measures the voltage of every cell, the temperature of every 5-10 cells and...
  7. W

    Engineering LED Circuit Design: Create w/1 Power Supply & 50mA Max

    Homework Statement I need to create a circuit that will take in a Vin, and then for a Vin of less than or equal to 1V, or a Vin greater than or equal to 2V, an led will light up. For this I can only use one power supply of +-5V, and the circuit cannot draw more than 50mA. Homework...
  8. I

    Circuit Design for a fractional -amplifier

    Circuit Design for a "fractional"-amplifier Hello all, I am right now in the process of designing a simple device that will help me measure the voltage response of a piezoelectric element attached to a specimen after it has been hit with a projectile. The obvious issue is that the amount...
  9. R

    How Do You Connect Vcc+ and Vcc- in a TL072 OpAmp Circuit?

    Ok, sorry for this basic question, I am currently designing a sallen-key high pass filter using a TL072 opAmp, with the schematic shown below, This circuit is connected to a piezo trasnducer whose signal I wnat to amplify. I was wondering, what do I connect to the Vcc+ and Vcc- pins of...
  10. S

    Circuit design question. Prototyping.

    Some of you may have seen my thread where i am using 555 (more then likely a 556 instead) to make a sequential tail light kit for my car. Its a pretty simple circuit that really only consists of the 556 chip, a few small caps, and a few resistors then the relays (currently using LEDs to get...
  11. P

    Circuit Design for Automatic Dustbin Lid Opening | Science Project

    hi everyone! for my science project, i want to create a circuit which automatically opens the lid of a dustbin when a person passes by the dustbin. Is there a particular type of circuit that i can use to accomplish this?
  12. R

    What Distinguishes AM from FM Transmitter Circuit Designs?

    I have been studying multiple AM and FM transmitter schematics trying to distinguish the differences in the circuit that create either am AM (amplitude modulated) or and FM (frequency modulated) RF signal. I have hit a road block as I am unable to see any significant differences between the two...
  13. M

    Engineering How Is the Third State Achieved in a 3-State Circuit Design?

    [PLAIN]http://img99.imageshack.us/img99/1046/fig9.jpg This isn't actually homework so I'm not sure it should be posted here but I think it fits. In the notes the teacher wrote that in this figure to think about how the third state (disconnected) is achieved, and well I've thought about it...
  14. R

    Usefulness of an RF Circuit Design Class

    I'm considering taking an RF circuit design class that would focus heavily on transmission lines and microwave circuits. It's supposed to be a tough class but I think I would enjoy it because I really like E&M. The problem is that if I take this class I won't be able to take a photonics class...
  15. W

    Get Help with Infrared Detection Circuit Design

    Hey experts! I've designed an infrared detection circuit to drive a motor, but I need the circuit and my math checked. I tried 5Spice, but I can't get my head around it. Circuit image attached. Do you know about how far I would be able to detect someone crossing in front of the light? I need...
  16. S

    Engineering LTspice iv Laplace circuit design help

    Homework Statement Find Io(t) for t>0 using Ltspice 4 Homework Equations n/a The Attempt at a Solution Here is what i have so far. I am unsure if i have the voltage source on the left correct or not. I am also stuck on how to use the current dependent current source from...
  17. T

    Basic Circuit Design: Converting 12V to 24V

    Hey everyone, At risk of sounding dumb here I go. :rolleyes: We are designing a basic electrical system that will have a regulated 12 volt, 10A source (A stator on a small engine) and I need to convert it to 24 volts to power two clutches. I am thinking about using two...
  18. N

    Engineering How Essential Are Truth Tables in VHDL Digital Circuit Design?

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  19. A

    I could use some help on this small circuit design - will it work?

    Hi! Please forgive me but this is the dodgiest circuit drawing ever made by anyone ever anywhere but I only had MS paint to hand :smile: http://img514.imageshack.us/img514/3940/dodgyelectronicspic.png It's a circuit which I want to use to make a small power circuit pulse at max voltage...
  20. T

    Circuit design: electron reverse-diffusion

    I'm looking for a material that acts like a powered diode. Where the material forces the electrons from from an area of low concentration of electrons to a high concentrated area. Think of two tanks of water of the same size and water volume (representing two sources of static electricity)...
  21. V

    How do I design a 5 GHz circuit with RF components?

    Hi all, I don't know if it's the right section in the forum, but here is my problem. I have to design a small pcb working at about 5 GHz, and I don't know how to start exactly... It's very simple, 2 sma connectors and 1 resistor. Here is the schematic...
  22. O

    Where to get the microelectronic circuit design for jaeger

    can anyone send me or tell me from where to get the microelectronic circuit design for jaeger please i neeeeeed it so much and i can't have it any one answer me as i have aquiz tommorow thnx
  23. S

    Phototransistor circuit design

    Can anyone help me to check and calculate the resistance required?I am confused on the calculation part. For example,the specification of a phototransistor is given below: Vceo = 45v Veco = 6v Vcbo = not in datasheet Vebo = not in datasheet Power dissipation = 75 mW Ic = 10 mA...
  24. R

    Tech 168( Integrated circuit design)

    best electronics outlet for integrated circuits. other than jameco.
  25. T

    Is My Circuit Design Correct for USB Charger and Main Load Sections?

    I was wondering if anybody could help with this circuit I'm working on. It has a USB charger section as well as a main load section. A JFET ensures the charger isn't connected while the load is on. A Mosfet allows the tact switch to control the load (0.3ohm) running 12 amps. I...
  26. T

    Where do I get started with analog/digital circuit design?

    How do I even get started with analog/digital circuit design? Can you recommend any books or lectures I can read or watch? How did you get started? Thanks!
  27. E

    How do you approach designing complicated circuits?

    Hi everyone, I have a question for anyone who considers themselves adept at designing circuits. I was wondering, how do you approach the design of complicated circuits? What stages do you go through to get from a concept to a real working circuit? I myself am not an electrical engineer...
  28. D

    Engineering Circuit Design Help for 0 to 5V Input and DC Output of 20V

    Hi! This is my first time posting here at PF, so forgive me if i am going against any rules. Homework Statement I haven been given a problem to design a circuit that takes an input ranging from 0 to 5V, and outputs: 20V (DC) if the input is between 1 and 4V and nothing for 0 or 5V...
  29. J

    Analog Circuit Design for Fuel Tank Sending Units: Help Needed

    Typical fuel tank sending units have a resistance of 0 to 10 ohms in the full position and 90 to 240 ohms in the empty position. I have an old Weston 50uA meter I would like to use as a fuel gauge. I need help with designing an analog circuit that will drive the 50uA Weston meter from the tank...
  30. S

    Engineering How Can I Design a Circuit to Counteract a Black Box Signal Alteration?

    I have to design a circuit that will undo the effects on a signal passed through a "black box". I have already determined that I have a pole at 500rad/s and a zero at 2000rad/s and a max phase shift of ~ -37* at ~950rad/s. It has a DC gain of 1 and a HF gain of ~0.25. The input signal is a...
  31. E

    Free Circuit Design Program Download | Multi-Sim Trial

    I was wondering if anyone knows of a free circuit design program that I could download. My university uses Multi-Sim which is an amazing program and it offers a free trial download but I was wondering if anyone knew of any other programs? Thanks
  32. F

    Circuit Design Help: Solve Audio Driver Issue on PCB

    Circuit Design help... Hi all... I had a question about a little audio circuit I am working on...its pretty simple it just consists of an audio amplifier (OPA134PA), an audio balanced line driver (DRV134), a audio differential receiver (INA137), and a few caps and resistors. When I hook...
  33. V

    Engineering Op-Amp Integrator circuit design

    Hey there This should be nice and simple. Here's the deal-- I was asked to design an Op-Amp Integrator circuit. For a 500Hz square wave input signal that oscillates from +/-0.5v, I was asked to design for a triangle wave output which oscillates from 0 to -5 volts. I designed the circuit...
  34. Q

    Engineering Circuit design, 2 equations, 3 unknowns

    I'm working with this circuit to design an ambient light meter. http://img201.imageshack.us/img201/6479/cktyu0.jpg We were given steps to go about solving for different values of the components in the circuit. First we're to solve for the gain and thus V1 which I found to be...
  35. D

    A good book on Logic Circuit Design for self-study?

    Good Engineering/College Physics Books?? Hello, I am trying to find books that are just down right outstanding and help college students understand calculus based physics. These books need to be great for reference and learning. Here is what I've found so far but I would love it if you guys can...
  36. L

    Spintronics/Magnetotronics Used In Circuit Design

    Hi guys, haven't really posted here much; but I've read a couple topics. I have been assigned a research topic in my EE class (2ndyear) and I choose to do it on spintronics. I have to write a ten page technical report on my chosen subject. Now, as I am without extensive knowledge of any of...
  37. M

    To program with embeded systems do you have to know circuit design?

    Hello everyone. Right now I'm a jr. computer engineer. I have a 3.9 gpa so i do work for my classes but I'm having majors issues with circuit design, Microelectronics, and Signals, transforms, and systems. I also really suck with hands on labs, like building circuits, and analyzing the...
  38. C

    Improve Network Performance with Delay Control for Send and Receive Circuits

    network circuit design? I was wondering if there is a schematic or if anyone knows of a way to delay the send and/or the receive of a network cable. Preferable separate circuits. For example can I control how fast people on my network receive but not control the send. May be in the wrong...
  39. J

    Circuit design and manufacturing

    Hello I am trying to find a all in one place that can engineer a circuit, create a prototype, and possibly do small quantity production. Does anyone know of a place, I've been searching the net for hours and most the ones I see are for just PCB design, or PCB design and manu. any help would be...
  40. N

    How Much Does Hiring a Circuit Design Engineer Cost?

    Could anyone tell me approx how much circuit design engineers would cost, or where I could find ones that I could hire? Thanks
  41. Z

    How can I design a circuit for an LED clock as a novice?

    I want to try and build an LED clock. The idea is to have a sequence of LED`s that light up one at a time at a regular time period over a pre-definied time. Once the all the LED's are on then they start to go off one at a time. I thought I'd just try and get 5 LED's to light up one at at...
  42. exequor

    What is the best software for designing circuits?

    What software do you guys use to design circuits? I have OrCAD 10 which is good for design and simulation but it does not support exporting to more commonly used formats, such as *.gif, *.png, etc. Also I hate ms visio, and smart draw is mediocre. I just need an app just for drawing circuits.
  43. Shahil

    Understanding Circuit Design and Transistor Configurations

    Hi guys! Need some help. Attached is a circuit that I designed. The Vin is 7.2V and the Vout (at the load) is 5V. Basically, that's exactly what I wanted! Anyway - can someone please help me with the understanding of the circuit. I know the basics but I'm a bit stumped on the use of the...
  44. P

    How can I design a circuit with specific voltage and resistance specifications?

    Hi. I'm having trouble on this problem, and hopefully someone here can help me. It seems really simple, but every way I try to do it either leads to a dead end, or in one case, a very complicated answer that's probably wrong. Here's the problem (the picture's attatched). RS is the...
  45. T

    Learn Circuit Design: Finding Good Books for Electronics Projects

    what are some good book on general circuit design? I know how to read schematics and the basics of electronic components (transformers, trnasistors, ect..). I want to learn how electronics work, so I can build projects myself instead of putting together canned ones. hopefully you will be...
  46. M

    How to Design an RTL Circuit with Basic Logic Components?

    I have to design a circuit that does the following operations: Add L to w w<--w+L Increment w w<--w+1 arithimetic left shift w w<--arithemetic left shift of w 2's complement of w w<--w'+1 Bit-wise complement of w w<--w' load L...
  47. L

    Designing Electronics: Understanding the Logic Behind Circuit Design

    I've been reading, trying to learn electronics. Everything I've read so far seems to be either components or finished circuits. I want to read about the 'inbetween' process. The 'why' for each step of the design. Why use this battery. Why use that size wire. Why put a resistor here. Why use a...
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