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

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0answers
42 views

Designing of charge amplifier for piezoelectric [on hold]

I am working at Piezoelectric. I use CEDRAT LA75 for amplifier. datasheet of LA75. I want to design charge amplifier like LA75. Values of bandwith range, input output range should be same. I want to ...
-4
votes
1answer
57 views

holes in an electronic circuit [on hold]

In many electronics circuits, I noticed that they have like small holes printed in them. What is the purpose of these holes?
0
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0answers
96 views

Switching career from firmware engineer to hardware engineer. Is it possible? [closed]

First of all: is it a wrong SE question? Please let me know asap. I asked here because there are a lot of professional people in the hardware design, with their own opinions. Coming back to the ...
0
votes
0answers
91 views

Why does USB-A have rectangular instead of trapezoidal cross-section? [closed]

I fully realize that USB-A connector design is now legacy and backwards compatibility will make us use it for dozens of years. However how can this existing design be justified? USB-A has rectangular ...
2
votes
1answer
61 views

Oscillations in Precision Voltage to Current Converter Design

I am trying to re-design the TI Precision Design - Low Level (5uA) V-to-I Converter. My design goals are: Increase bandwidth from around 1kHz to 100kHz (ideally 1MHz in the future) Increase output ...
5
votes
2answers
91 views

When to “wind-your-own” vs “scavenge” a transformer?

I often see answers for one-off designs including the advice, "Just wind a transformer...." Like it's no big deal. Did I miss a class in which they handed out a sheet listing the formulas for core ...
0
votes
3answers
76 views

What determines the output voltage of this SMPS?

This website http://danyk.cz/impulz4_en.html says that the output voltage is due to the zener diode that has a forward voltage drop of 18V. But zener diode is just a clipper that regulates the output ...
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votes
1answer
68 views

Transistor PWM Switch H-Bridge

Update from old post I have made a completely different design and was wondering if you guys could take a look. Schematics: http://imgur.com/a/5GRe5 Description: Figure 1 is a charge pump, boosting ...
0
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0answers
40 views

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 ...
11
votes
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 ...
3
votes
1answer
65 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 ...
-4
votes
1answer
73 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.
0
votes
1answer
38 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 ...
39
votes
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 ...
1
vote
1answer
27 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 ...
0
votes
1answer
15 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: http://www....
0
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0answers
71 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 ...
0
votes
2answers
58 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 ...
-3
votes
1answer
71 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 ...
0
votes
1answer
36 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?
1
vote
1answer
84 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 ...
0
votes
0answers
34 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 ...
0
votes
1answer
88 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
votes
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 ...
19
votes
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 ...
3
votes
1answer
206 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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votes
1answer
72 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
votes
1answer
107 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 ...
0
votes
0answers
37 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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votes
3answers
176 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 ...
0
votes
2answers
84 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 ...
6
votes
4answers
971 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 (...
1
vote
0answers
85 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 ...
1
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1answer
74 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 ...
0
votes
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 ...
0
votes
1answer
87 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 ...
0
votes
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 ...
0
votes
2answers
90 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 couldn’...
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votes
1answer
74 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
0
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0answers
109 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 ...
0
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4answers
83 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 ...
1
vote
0answers
75 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 ...
0
votes
1answer
75 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 70°...
0
votes
1answer
128 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 operation....
0
votes
2answers
45 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 ...
0
votes
1answer
144 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. ...
0
votes
1answer
223 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 ...
0
votes
1answer
37 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 ...