The process of creating electronic products, including components and end-user devices.
0
votes
0answers
24 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
68 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 ...
23
votes
4answers
1k 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 ...
-5
votes
0answers
31 views
Counter design with 74193 [on hold]
Count down 5 4 3 2 1 0 after this,
Count down 4 3 2 1 0 after this,
Count down 3 2 1 0 after this,
Count down 2 1 0 after this,
Count down 1 0 after this,
How can i design this problem by ...
1
vote
0answers
79 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 ...
0
votes
0answers
23 views
How to derive performance equations from datasheets
I've been researching how to derive an equation for an IR distance sensor's response curve, located here.
I surmised that there is a way to use Excel to plot a trend line to get a fairly exact ...
-1
votes
1answer
55 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
98 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
33 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 ...
-2
votes
3answers
159 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
32 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
956 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
53 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
vote
1answer
64 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
23 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
69 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
39 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
70 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 ...
-1
votes
1answer
62 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
votes
0answers
87 views
48-bit memory in flat/matrix organization
I have received an assignment for a computer systems course to design a 48 bit memory with 3-bit words, 16 words, 4 address bits in flat design and 2 in matrix design) with the use of D-flip flops.
...
0
votes
0answers
71 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
votes
4answers
74 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
53 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
71 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 ...
0
votes
1answer
75 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 ...
0
votes
2answers
34 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
129 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
44 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
31 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 ...
0
votes
2answers
121 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?
0
votes
1answer
82 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 ...
0
votes
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
votes
1answer
153 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
votes
3answers
103 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 ...
3
votes
1answer
86 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 ...
2
votes
1answer
259 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 ...
0
votes
1answer
43 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 ...
-3
votes
1answer
77 views
How to design a circuit with array of amplifiers? [closed]
If I have a very tiny signal voltage and I want to amplify it 100 times higher with low noise amplifier, how should I design the circuit? I mean for example how should I know that I need capacitors ...
4
votes
3answers
128 views
Why is USB type C connector hollow?
If we look, for instance, at a Lightning cable, its connector is shaped like "—", with receptacle being "=". Apparently, this construction contributes to durability, to the ease of use, and lowers ...
0
votes
2answers
117 views
Designing USB device [closed]
I want to build a USB peripheral device. The Device is to connect to an Android smartphone with USB OTG capabilities. The smartphone will be a host and will run an app that communicates with my ...
2
votes
1answer
51 views
Parallel bus trace width and spacing
I have been working on designing a PCB for a Z80 computer that I plan to sell a few times for interested people. The Z80 will work at a maximum of 8 MHz and has parallel lines going to a system ...
0
votes
2answers
72 views
How can I determine what type of resistor, transistor and, diode I need?
I'm trying to build the following circuit
Given my solenoid draws 1.4A, how do I determine what type of resistor, transistor, and diode I should use? What if I were to change my power to 9V? I'd ...
0
votes
2answers
45 views
SPICE Programs worth learning for [closed]
I was wondering what are the professional SPICE programs for simulating analog circuits in the industry now. For example, where the big companies like Atmel simulate their microcontrollers, or a ...
0
votes
0answers
75 views
wheatstone bridge pressure sensor configuration
I'm a student working on a pressure sensor that requires voltage amplification in order to read a 0 to 5V output on an ADC input for a PSoC CY8CKIT-042-BLE pioneer kit.
Voltage supply is 5V DC
In ...
1
vote
1answer
122 views
SX1272 - LoRa - What is the minimal schematic (needed capacitors/resistors) to use that device?
I'm interested in SX1272 by Semtech. It's a LoRa modem.
I'm not the best at reading datasheets. Maybe it's because of my poor English. I wonder what is the minimum schematic of such a chip? What ...
-4
votes
1answer
121 views
Building a low-cost oscilloscope and a function generator [closed]
I want to build an oscilloscope and a function generator as a graduation project in my university. Cost should not exceed 125$ or 250$ if the project has more additional features. I will display ...
0
votes
2answers
79 views
where i can find allwinner library for eagle
I work in a project using Allwinner a10 CPU and eagle software i did't find the library I already tried to searched in google and github many time for Allwinner a10 library for eagle software but I ...
6
votes
2answers
153 views
MOSFET Circuit Design and Thermal Considerations
I'm a newbie at EE, and just I wanted to verify that the design I came up with for a MOSFET circuit that drives a 12V 500mA water pump will work. I'd also like to confirm I can run the N-Channel ...
1
vote
1answer
125 views
Is this memory card circuit designed properly
I'm looking to build a reusable memory card for my SRAM as the cost of the chips can get up there. I'd like to be able to plug this into other projects (mainly with a W65C816S as I work with it) both ...
