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

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Product Category

I am designing a single phase energy meter with below Spec - Input Voltage 240Vac - Input Current 0.5mA - Product will be sealed in plastic enclosure - Line and Neutral line, No earth Input in product ...
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1answer
50 views

How to reach 20MSPS with a 20 MHz clock in SAR? [closed]

What does this 20MSPS actually mean? Also, an n-bit SAR ADC takes n+2 clock cycles to complete a calculation, then how will I be able to reach the 20MSPS rate using a 20 MHz clock? I have be given a ...
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4answers
1k views

Rocket launcher circuit design

I'm building a model rocket launcher with my son. The circuit is very simple as you can see. We want to add a buzzer and a LED/bulb when it is turned on as a warning to stay clear of the rocket. How ...
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1answer
58 views

FTDI Vinculum code read out protection

I designed a USB dual host based on a FTDI's VNC2-32L1B. I'd want to protect its firmware from being read/copied cause it contains pretty sensitive data (private keys, etc.), but the VNC2 has no read ...
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1answer
71 views

What electronic component is this? - sensor part of particulate matter sensor [closed]

What electronic component is this? This is a part of a laser sensor which measures particulates.
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1answer
35 views

Narrow bandpass filter using maximally flat LPF prototype design

I'm doing a project involving wireless power transfer, where an LED will be turned on via 2 induction coils (tx and rx). The interfacing power circuitry for this has already been figured out (an ...
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5answers
2k views

Ceramic caps vs electrolytic. What are the tangible differences in use?

A quick google around and all I seem to be able to find are people talking about the physics & the chemistry of the capacitors but not how this affects choosing which to use. Avoiding talking ...
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1answer
26 views

Implementation of NIOS Softcore alongwith HDL modules on Aletra Cyclone IVGX

My question is not on 'how can' but 'if can'. So I believe people with sufficient experience on any FPGA family might be able to help me out here. Problem Statement: I need to model a very basic ...
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1answer
14 views

Lower Power Inductive Heating Circuit Design Questions

I'm trying to design a very low power (<=10W) inductive heating circuit that will heat the work material to 40-50degC. I've seen plenty of Royer Oscillator circuits online (see here: ...
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47 views

Multistage Amplifier Design using differential amplifier

I am a freshman in ECE major and try to design a multistage amplifier. The requirements are: Rs = 100 kΩ RL = 10 kΩ CL = 47 pF PMAX = 5 mW gain must be at least 50 Here is what I design. I am ...
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53 views

practical design of integrator circuit with Rogowski coil

I am designing a current sensing device, using a rogowski coil.To give a simple explanation of the Rogowski coil, if I were to disregard parasitic components L2, R1, C1 and R2 the output voltage would ...
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2answers
55 views

Is there a circuit that amplifies current or voltage relative to signal frequency?

I am trying to create a circuit that outputs a higher voltage/current as the frequency of the signal input (such as an audio input) gets higher - such as to allow all frequencies to bypass a capacitor ...
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1answer
70 views

load cell continuously monitor load

I want use 50 kg of load cell of weighing machine to measure 30 kg of load for an one or two months,and load continuously decreases because of consumption on daily basis. my question is that the ...
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1answer
34 views

How to to design a PCB lib for components with variable dimensions?

I'm designing various PCB libraries for components. But sometimes they have variable dimensions: How should I design the pads for components with fluctuating values?
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1answer
81 views

When to stop working on a PCB layout

I currently have this PCB layout for a project: Now I'm unsure if I should invest more time to get rid of some vias or if I just should finish it off and order the board. Do vias matter for such ...
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31 views

Designing a system to move a marble on a rotating beam from point A to point B using a servo

I need to figure out how to design a system to move a marble on rest at point A to point B at rest. See my drawing below for what I'm trying to accomplish: I have an Arduino I could use as a ...
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1answer
82 views

Alternatives to mounting tube sockets on a PCB

It occurred to me that since tubes get inserted and removed that this could cause some flexing in the board and break things. Whats the alternative to not mounting it on the PCB for a more physically ...
28
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5answers
2k views

Design Calculations for the Seasoned EE

Do seasoned designers tend to do a fair amount of calculations or are large parts of circuits designed intuitively? I'm asking because it seems like design engineers tend to have a sense of what value ...
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4answers
2k views

After PCB layout

After you've designed your circuit and have the PCB layout completed, how do people in the EE industry go about designing the enclosure? What kind of considerations need to be made to accommodate the ...
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1answer
200 views

Current sensing at μA accuracy and ADC nonlinearity

Project context A battery-operated positioning device sends location information through GSM at regular intervals. Between the fixes, the device is in low-power mode. The battery is supposed to last ...
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1answer
62 views

SFP vs LAN port [closed]

From a board design standpoint, What are the categories to consider when picking between an SFP and LAN port. This is to be used as a 1GE management data path so regarding data rates both options ...
4
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1answer
104 views

Getting started with Qualcomm reference designs

I am looking to get started with Qualcomm Reference Designs. I am partly inspired by this article: "Start Your Own Smartphone Company for $1,000". I have an application that I would like to be able ...
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35 views

H Bridge 555 Timer Votlage Drop

I am building the circuit presented at 4:45 in this video https://www.youtube.com/watch?v=iYafyPZ15g8 The problem is the frequency of the output of the 555 timer changes depending on the whipper but ...
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3answers
170 views

Approval before using built portable charger on a smartphone

I've finally managed to set up a more efficient portable charger that uses 8 AA alkaline batteries(actually not so efficient). Schematic: simulate this circuit – Schematic created using ...
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2answers
56 views

Can I increase torque and Rpm in a DC electric motor safely using outside magnet

I'm wondering as a layman what would happen if you place a magnet on the outside of a DC motor. This has been documented on YouTube using a small 12v motor. I'm wondering what would happen to a larger ...
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4answers
969 views

How to get a FPGA design that will definitely work on actual hardware

I have just started learning digital logic design with FPGA's, and have been building a lot of projects. Most of the times (since I am kind of a noob), I have a design that simulates perfectly ...
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78 views

Finding Values of Rd and Rs to satisfy the N-MOSFET design

I've been stuck on this design problem for a while and I am just filled with a lot of equations and unknowns and not getting anywhere with it. Here's a picture of the problem with the problem ...
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1answer
72 views

How to use one 12V power supply to supply two Op/amp with 5V and 12V voltage supply?

I am trying to design a circuit and i have two Op-Amp with different supply voltage with -+12V for LT1220 and +-5V for LT1193. i want to use just one power supply with +-12V. in that case for Lt1193 i ...
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1answer
27 views

C4D capacitively coupled electrode sensing - circuit simplification

I am trying to make a detector to pick up small changes in capacitance. Basically both electrodes have a common ground and are closely spaced. One is driven by oscillator at 0.1-1MHz and the other one ...
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1answer
81 views

Vibrating bracelet controlled from cell phone [closed]

I was inspired by this project: How do I build a bracelet that vibrates once every n minutes? but I want to take it a step further. The main idea is creating a vibrating bracelet that is controlled ...
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1answer
42 views

Values instead of designators on assembly drawing

While creating new Altium component for our company's library I started to wonder: why one would place a designator on an assembly drawing instead of value of a component? Wouldn't it be easier to ...
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2answers
84 views

How to drive a linear MOSFET like IXTK22N100L?

i am trying to simulate an electronic load. in that case i would like to employ a linear MOSFET IXTK22N100 which has Ciss= 7n for having a current at 150khz at output. but in the simulation i ...
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1answer
72 views

Can a same phy be used for IPV6 and IPV4?

Currently I am using LAN8720 from microchip in my device for IPV4 network?Can same PHY work with IPV6 network? If yes the why? and if no then what can anyone suggest me a decent chip for it? Thanks
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98 views

Colpitt's Oscillator: How do I set the output peak to peak voltage of the oscillations?

Good day, we are currently working on a VCO project that uses a transistor based Colpitt's Oscillator. We were asked to select a frequency of operation where we selected 89.1MHz as its center ...
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4answers
81 views

Common practice for creating software switchable power rails

I have created a circuit which has a HackHD camera attached to it. To turn on and off the video, you drive a pin to ground for a fraction of a section. The GPIO pin fluctuates on boot, which triggers ...
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70 views

Piezo speaker driver not giving full differential voltage - why?

I am trying to drive a piezo speaker at 20kHz with maximum voltage swing from a 10V source. Previously I had used a square wave plus its inverse to give the equivalent of 20V across the speaker but I ...
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1answer
72 views

High temperature battery chemistries

I'm currently developing a solar powered data logger that sits outside in direct sunlight for a good chunk of its life. Preliminary testing has shown that the inside of the enclosure can get up to ...
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1answer
108 views

How do I calculate maximum frequency supported by an optocoupler say for example PC817 and what factors it depends on? [closed]

I am currently working on isolating SPI bus.The SCLK for my non isolated version of design is 5MHz .How do I calculate whether the optocoupler is suitable for operation at this frequency of ...
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2answers
42 views

PhotoMos relay -calculating the right resistance value and input voltage

For a EM coil relay I would choose the input voltage based on the coil rating. And a freewheeling diode based on maximum reverse voltage that appears across the coil. I am not able to find something ...
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140 views

High Current Power Supply Design [closed]

I'm looking to design a high current low voltage power supply that goes beyond my limited circuit knowledge. I have plenty of experience putting circuits together, but not so much on the design side. ...
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1answer
149 views

Altium designer transfer to pcb issue

I designing a pcb with 14 sheets in hierarchical option. In order to transfer my components to pcb doc i get error sign in some net names without error message! With that error i get "failed to add ...
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1answer
35 views

Need component/device to power a light from two seperate inputs

First question here, and don't work on electronics often, so tips are welcome. This might have a very simple solution. I tried to use the schematic editor to the best of my knowledge to recreate an ...
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2answers
288 views

Can I connect many SX1272 (LoRa) based devices to a gateway?

Simple question: Is SX1272 chip by Semtech capable of sending data to LoRa gateways? I'm a little bit confused about LoRa and LoRaWAN. What is the difference?
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1answer
96 views

How to make an Audio Amplifier

I am about to attempt make my first audio amplifier (beyond an LM386 amp). I chose the TDA2030A (dataheet http://www.st.com/web/en/resource/technical/document/datasheet/CD00000128.pdf). Since its a ...
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1answer
46 views

How can I assemble and control two different hands on a watch face?

I want to make a device with two hands that rotate independently of each other, just like the hour and minute hands on a watch. I'm struggling to figure out how to actually design and implement this ...
4
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1answer
166 views

Why is this diode here?

I am building a VU meter. Searching in the Internet and coming up with some things on my own, I ended up with the following circuit First, there is an amplifier whose role is to give the VU meter ...
3
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3answers
109 views

Design help! — Play a pure tone into a mic and depending on its frequency a specific LED will light up

I'm still new to electronics and am making this in order to learn more about circuit design and filters. I do not want to use microcontrollers. I want a purely analog solution. I'm trying to make a ...
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1answer
93 views

What is a good way of estimating how long a battery will last for powering up a microcontroller

I know this is going to be a broad question, but I'm looking for a broad answer that can get me a ballpark figure. When building a board with microcontroller, what's a good way to estimate how long a ...
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1answer
262 views

Why would someone prefer halfwave rectifier over bridge rectifier? [duplicate]

The other day, out of curiosity I was measuring the current wave shape of a laptop charger. The wave shape indicated a spike only in one half cycle. I'm guessing half wave rectifier here. One thing ...
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64 views

how to remove this error “ERROR 152: Port on instance does not exist in entity declaration for instance”?

I am new to Cadence Allegro HDL for schematic design and for my first design i got this error. In 728 page document provided by cadence its is mention as follows, "Open the symbol for the component in ...