The process of creating electronic products, including components and end-user devices.

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27 views

Quick diagram of a 8 x 3 chip [duplicate]

I have a problem I've been trying to figure out for hours, but hardware isn't my thing. I can't seem to visualize or understand the solution to the problem I got. I was instructed to design an 8 x 3 ...
16
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6answers
2k views

New to PCB design - why doesn't auto placing components exist?

The circuit design software I have seen has the ability to automatically route traces etc. on a PCB. But why doesn't this software have the ability to automatically place components on a PCB say to ...
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0answers
29 views

Hack Quartz Clock Movement with Chronodot

I'm working on creating a clock design that will use an off the shelf Quartz Crystal Clock Movement. I know they are not all that accurate and was thinking of a way to make it more accurate. My ...
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2answers
166 views

How to create a frequency doubler circuit using only flipflops/ Digital elements?

First things first, is it even possible to scale up the frequency using only digital elements, atleast approximately? Though a frequency divider circuit can be designed very easily with flipflops. In ...
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1answer
47 views

How do you design a circuit to implement the Bipolar Line coding Technique?

Bipolar NRZ http://www.tutorialspoint.com/data_communication_computer_network/images/bipolar.jpg In this technique alternate 1's will have alternate polarities and 0's will be zero itself.
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2answers
49 views

Design Considerations for Raspberry Pi Expansion Boards

I am venturing into the space of designing expansion boards for Raspberry Pi's. I have done this for Arduino boards but RPi's are a different beast. From personal experience I have already had ...
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0answers
30 views

Critique and dos/don'ts for an H-bridge PCB design?

Honestly have no idea if this is something this site was made for, but I have a couple of questions about my design, mainly it comes down to "Will it work?" and "Why would it break?". JC1 and JC2 are ...
2
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0answers
58 views

Sequential Traffic Light Controller

Just for clarification: I'm just looking to see if I'm on the right path for this project and to figure out what the best plan of attack might be. I'm trying to simulate a sequential traffic ...
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2answers
288 views

Designing an 8 x 3 memory chip given 2 4 x 3 chips

I'm working on a problem that asks me to design an 8 x 3 memory chip given 2 4 x 3 memory chips. I'm not sure how to approach this problem. I've looked at the textbook and found various online ...
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1answer
277 views

Micro and Nano Memory, Calculate Reducing Bits?

I ran into a question: in digital system with micro-programmed control circuit, total of 32 distinct pattern operation signal is ...
1
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1answer
103 views

“zero voltage drop diode”…Really?

In my research for this question, I found this by a new user that hasn't been seen before or since. His low investment here and the "say goodbye to traditional bad stuff" language makes his answer a ...
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1answer
43 views

Is it permissible to use fractional aspect ratio W/L for MOSFETs?

I am designing a 2-stage op-amp (Miller compensated). For compensation, I am using a nulling resistance R in series with the compensation capacitance C, with the resistance implemented using a ...
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4answers
102 views

How to detect reverse-polarity post-mortem?

Original - Apr. 13, 2015 There are many questions here about preventing reverse-polarity, most of them ending up with a series FET that is driven by the opposite supply rail: (shamelessly stolen ...
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1answer
79 views

Regulator circuit design

I need to design a regulator for my thesis, but I really need help, Please! The topic: - A temperature regulator for a small fridge Some details: - the regulator has to control a peltier element ...
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5answers
120 views

Is sequential logic really required to solve some types of problems? [closed]

Can all digital design problems theoretically be solved using only combinational logic, or are there specific examples that have to be solved sequentially? I read that sequential logic is only ...
0
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0answers
15 views

Are there any sound design guidelines for high-loudness piezoelectric sirens?

This is a somewhat tricky question so if the title is not clear please correct it. I have disassembled a siren used for auto and home alarm. It was originally driven by a digital circuit with lots of ...
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2answers
45 views

Designing a MOSFET current mirror circuit

This is the design problem: This is a brief of my design for W and L of the transistors and R: I've connected the upper voltage source to ground and made the lower one equal to 0.4 V to make ...
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1answer
38 views

How to setup PCB to correct for signal integrity issues after boards are made?

I have a board layed like the in the image below. I have a microcontroller that generated clk1, which feeds into U1. After 8 clock cycles, the clock passes through to U2 and does this 30 times. It's a ...
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1answer
47 views

Fail Safe for circuit, when input is removed

I have built a circuit which inverts the signal of a ULN2003A, it is in turn connected to a relay. It is possible for the ULN2003A output to be disconnected from the external circuit as it is remote ...
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0answers
62 views

logic for 4 story elevator

I'ev got an assignment where I have to design the logic for an elevator that is being used in a 4 story building. I am using this pdf as a reference. The problem I'm having at the moment is I can not ...
2
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2answers
93 views

Is there a simple circuit that outputs (min+max)/2 of a single-ended signal given as input?

I have a digital, single-ended, signal that randomly varies between +400mV (logical ‘1’) and 0V (logical ‘0’). I am looking for a circuit to calculate the DC value that corresponds to the average ...
0
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1answer
39 views

Bluetooth Modules in a plastic enclosure

I would like to implement a bluetooth functionality in my project, preferably using STMicroelectronics SPBT2632C1A.AT2, with a protective enclosure. But I read from multiple sources that bluetooth ...
0
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1answer
70 views

Designing a common-emitter amplifier circuit

We are asked to design values for RC, RE, R1, and R2 for the following common-emitter BJT amplifier: It's easy to calculate RE and RC: But I couldn't find a ...
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0answers
47 views

n-Bit Parallel Register Implementation

I need to implement a bit slice of this register as a module. However I cannot figure out how to design the circuit to produce the desired outputs. ...
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1answer
54 views

In what order should I isolate and attenuate an audio signal?

I have a cheap bluetooth audio module (with no documentation) that outputs a signal greater than line-level. It was probably designed to be connected directly to small speakers, since the ground on ...
0
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1answer
83 views

AB class amp, design considerations

I've been playing around with this circuit. It's a minimum parts AB class amp. I've managed to get it to work but I still don't understand how should I optimally adjust resistor values and ...
2
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1answer
46 views

One-Line Diagram Standardized Symbols Information

Good day, people. I'm trying to get into electrical substation design and I'd like to know which standard sets the rules for substation One-Line Diagram Symbols . Any ideas of where can I get that ...
2
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1answer
66 views

Using Electronic Components To Make A Chain Reaction

I've been tasked with creating a Rube Goldberg machine that employs mechanical, chemical, and electric components as a school project. I've got ideas ready for the two former topics, but I'm stuck on ...
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1answer
48 views

Hi, in following circuit how do i calculate value of inductors L1, L2, L3, L4. (Design equations for inductors)

What will be the design equation to calculate values of inductors L1, L2, L3, L4.
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0answers
33 views

ATMega32U2 USB Issues

I purchased a couple ATMega32U2 chips from Varical the other day since they were very well priced and there was free shipping. I also finally discovered the pinout to this QFP32 socket I have. So I ...
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3answers
57 views

Thickness Measurement

I would like to measure the thickness of a stack of paper without touching it. The measuring device needs to show if one sheet is removed. I do not need to know the measurement in inches. Units are ...
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2answers
43 views

Use to switches to provide necessary voltage

I am wondering how to work this out and have been busting my head over it over night. In fact, I was working on this till 03:00. In all, my shed is solar powered. I am only powering some LED 1W ...
0
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0answers
28 views

why resistance of n-channel transistor in series is less than p-channel transistor?

why series n-channel transistor resistance is less than the p-channel transistor? how n-channel transistor are faster than the p-channel transistor? why additive "on" resistance of series transistors ...
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1answer
95 views

Power on reset circuit for microcontrollers

In this schematic, there is a reset circuit with two pushbuttons: The button marked "warm reset" sends an active low signal to one microcontroller, while the button marked "cold reset" sends a ...
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2answers
74 views

Possible to imitate a wolf's howling with a simple electronic circuit?

I would love to build a small circuit board that outputs something that sounds similar to a wolf howl to a small speaker. With "simple", I mean I would prefer if I could use simple components such as ...
2
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1answer
81 views

LM2907 schematic critique

I have been working with the LM2907 as I have been designing a few circuits around it. This has lead to me wanting to understand more of its inner workings and build up a breadboard model of the ...
6
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1answer
687 views

Should I avoid BGA?

I am designing a board and have found that a BGA component is cheaper than the larger footprint. I am curious if I should be reluctant to implement a BGA with regard to extra steps during ...
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0answers
46 views

how to simulate wide swing cascode current mirror

I want to design a wide swing cascode current mirror (question-left) and in order to apply Iref, I have designed a PTAT and applied it to M3 and M5. Iref must be 50uA and the diagram of output should ...
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1answer
97 views

Connecting Microcontroller to Higher potential

I am curious how to determine what voltage is acceptable to connect to a micro-controller through a resistor. From the data sheet the highest voltage on a GPIO is 3.8V. So If I have 5 Volts going ...
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1answer
84 views

static Hazard and challenging questions

i read some notes that wrote: for following Function F, has static Hazard, if B=C=D=1, and for each change in value of A, the Static Hazard 1 can be. Why this statement is True?
3
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1answer
56 views

Storage lifetime considerations for electronics

I am working on a single board computer that I am aiming to last for up to 30 years. It will be based on this design, with a lm7805 voltage regulator circuit and address + data line LEDs. I am ...
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2answers
111 views

SystemC vs HDLs

I am currently involved in a university project to implementing a processor of an existing instruction set. The idea is that by the end of the project I should be able to synthesise this design and ...
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0answers
36 views

FSB decoupling capacitors and what are their functions

I'm reading the intel core2duo datasheet and it says bellow regarding front side bus. The processor integrates signal termination on the die. In addition, some of the high frequency ...
3
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1answer
54 views

For IIR low-pass filters, what design provides the least amount of phase shift in the pass band?

Given all the possible design options for IIR filters one could consider (e.g. Butterworth, Chebychev, inverse Chebychev, elliptic, Bessel, etc.) which design provides the least amount of phase shift ...
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0answers
53 views

Expandable power supply for multiple components with different power requirements

Suppose an Arduino based project involves multiple sensors and actuators, each with its own power requirements, what are the ways to build single power supply for it ? Further is it possible to make ...
0
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1answer
70 views

Modular mixing table with balanced internal bus: is this a proper way to do it? [closed]

TL; DR: Is the schematic below seem like a proper way of building a mixing console with differential internal bus? I always wanted to have a mixing console but I want to do it the maker way: build ...
34
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6answers
2k views

How do you document your hardware design decisions?

How do you document your hardware decisions in the design phase? How do you avoid having to ask yourself the following questions while reviewing an hardware design that you made in the past: Why did ...
0
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2answers
59 views

Homemade PMOS LDO again, is a few millivolts of oscillation normal?

After I walked through datasheets of different op-amps it turned out that I can live without the NMOS as a driver for the pass transistor, using TL084 op amp (or ...
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54 views

Hardware design methodology

I would like someone to explain the three domains in hardware design and the relation between each of them. And how is it used in Hardware design. I tried searching on the internet, but I find ...
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2answers
82 views

Design of Op amp given transfer function

i want to create a circuit as a homework with Operational Amplifiers ,Resistors and Capacitors that has a transfer function : Actually i have been given the following ciruit and its transfer ...