Circuit design Definition and 95 Threads

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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?

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...

[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...

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...

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...

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...

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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...

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)...

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...

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

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...

best electronics outlet for integrated circuits. other than jameco.

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...

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!

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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

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...

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.

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...

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...

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...

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...

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...