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

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External low-power clock design review

I am designing an outdoor wireless sensor node using an ATtiny861a MCU that will be operating at 1.8Volts. I am basing my work off of a previous sensor node that used a LTC6930 silicon oscillator ...
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3answers
72 views

PNP Transistor Leak

I have a problem with a circuit that should be simple but has caused me some annoying problems. Summary: I need a switch that closes when the power is off and opens when the power is on. My solution ...
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0answers
15 views

LED Matrix design in Logisim to display a count sequence

I've built quite a large circuit (at my level) that generates outputs d3, d2, d1 & d0. d3 and d2 are generated by a multiplexer / OR gates and d1 / d0 are generated by an 8-1 MUX. These outputs ...
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61 views

Tantalum Capacitors to Electrolytics Capacitors/Ceramic Capacitors

I'm trying to reduce costs from my design and one of the things that I'm thinking about is changing the Tantalum capacitors to Electrolytic ones with low ESR. P.eg. I'm applying one Tantalum ...
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1answer
59 views

D.C power supplies, regulated linear power supply question

Design giving the necessary ratings and characteristics the necessary for the transformer, bridge rectifier capacitor and regulator , a 12v , 2A regulated power supply . the available mains supply is ...
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50 views

D.C power supplies , necessary ratings and characteristics question [closed]

Can anyone help me with the question please ??? Design giving the necessary ratings and characteristics the necessary for the transformer, bridge rectifier capacitor and regulator , a 12v , 2A ...
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0answers
42 views

HELP ME design cycle in block diagram request [closed]

HELP ME design cycle in block diagram request 4 bit
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2answers
76 views

How to design blinking LEDs circuit using analog elements only?

I want to design a circuit to blinking three LED in a row with 2 second delay for shifting/changing using analog elements only (using Resistors, Capacitors and Transistors and without Micro ...
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16 views

Circuit to integrate BeagleBone Black with Pressure Regulator

I am using BeagleBone Black as controller to control a proportional pressure regulator (Festo VPPM-6L-L-1-G18-0L10H-V1P-S1) which is the actuator of my project. The pressure regulator has an input ...
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2answers
98 views

Advantages of depletion mode FET devices over enhancement MOSFETs

I've grown the impression that JFETs and depletion mode MOSFETs are not used very much nowadays, especially in new designs. I know that they need different bias networks, especially as discrete ...
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3answers
139 views

How does one approach designing an amplifier using BJTs to drive an 8 ohm speaker?

For a lab class we were assigned a final project where we have to design an amplifier using BJTs, diodes, and capacitors (MOSFETs are not allowed) in order to drive an 8-ohm speaker. The requirements ...
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1answer
69 views

Where do these values come from?

Looking at an ATMEL SAM4E and I'm looking at the schematic checklist published by Atmel for the SAM4E and the schematic for the SAM4E-EK developer board. SAM4E checklist SAM4E-EK Design files ...
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2answers
90 views

Dual rail switching PSU critique

I am looking for feed back on the following power supply design. This power supply is intended to have 2 outputs: 24V @ 500mA and 32V @ 850mA. When the power supply is in standby, J1 pin 1 is @ 0V, ...
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1answer
66 views

Is my Rigowksi Coil turns calculation correct and how to calculate the sensitivity?

First, I would like to show my calculation. Please correct me if I'm wrong. Suppose the maximum induced voltage in the coil is 250mV and the current to be measured is maximum 1000 A. So, the current ...
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1answer
67 views

How to Design Arduino Voltage and Current Sensing Shield

I am trying to design an Arduino shield that measures raw voltage and current of a small refrigerator (115V, 60W). I have an Arduino Mega board. To one of the ADC inputs I have connected a (non-split) ...
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3answers
483 views

How do integrated circuit design companies create their datasheets?

Especially for something like a microprocessor. I assume the majority of information is "auto-generated" or we'd see a lot more typos and errors. A laughable scenario keeps popping into my head ...
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1answer
93 views

JFET biasing problem

I tried solving this problem, however I feel like there's something missing, I am asked to bias a N-channel JFET with using this provided data: Idss= 12 [mA] VDD= 12 [V] VP = -5 [V] VDS=VDD/2 ...
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6answers
1k 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
35 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
199 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
55 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
60 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
47 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 ...
3
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1answer
106 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
331 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
288 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 ...
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1answer
124 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
61 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
113 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 ...
3
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1answer
89 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
125 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 ...
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0answers
21 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
66 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
39 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
57 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 ...
2
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2answers
112 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 ...
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1answer
47 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 ...
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1answer
81 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
58 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 ...
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1answer
93 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
91 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
69 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
50 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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48 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
59 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 ...
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0answers
29 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
154 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
76 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 ...