Questions tagged [component-selection]
All related to methods to select the correct components and/or component values to specific applications
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3.55 mm jack wiring
I have two inputs in my circuit which I am feeding using the two jumper wires. I want to use a 3.5 mm female jack in place of those jumper wires. Right now I have this 3.5 mm female jack but i don't ...
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1answer
27 views
How to Choose Proper Components for Class D Amplifier Circuit
Hi I am designing a class B amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board (see below).
I have tried building out this ...
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56 views
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32 views
Material selection for conductivity electrodes
I was wondering what kind of properties i should be looking for when selecting ideal materials for electrodes in a conductivity sensor measuring the conductivity of liquids (1,1,1,2-Tetrafluorethane). ...
4
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1answer
184 views
Moving brute-force search to FPGA
I am currently working on a scientific hobby project about computing the error detection capabilities of CRCs. Unfortunately the C++ code used for such computations has up to years of run time on ...
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2answers
61 views
How to calculate resistivity from this cell design?
I was wondering how/which area and distance values are calculated for a concentric 2 electrode conductivity sensor (below) when trying to calculate the bulk resistivity of a fluid. The blue is the ...
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1answer
59 views
Finding the resistivity of high resistivity liquids
I'm working on a project to determine the resistivity of 1,1,1,2-Tetrafluoroethane
which is estimated to be around 10^14 ohm-cm. The problem is, the most sensitive commercial conductivity sensors for ...
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1answer
55 views
74HC589 - stock lead times are high, looking for alternative parallel to SPI tri-state chip for ESP8266
My prototype was going to use 74HC589 as a parallel to SPI interface for ESP8266-07 MCU. They are in short supply for quick delivery at the moment.
I am asking for suggestions for a similar chip ...
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4answers
82 views
How to Turn off a PIC Microcontroller in high capacitance circuit?
Below image is the input voltage VDD to PIC16F18326. I am turning off (Switching off the mains supply) my circuit at point A (see image). Due to large capacitance at load, which is required in my ...
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1answer
76 views
What's the difference between these varieties of octocoupler? [duplicate]
It looks like ON Semi makes a bunch of different kinds of optocouplers for various applications. The array of choices is kind of bewildering. What, exactly, is the difference between an optocoupler ...
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1answer
368 views
Is C0G a synonym for NP0?
This question is in the context of a production environment where part numbers and change notices are strictly controlled, and any alternate manufacturer parts under an internal part number must be ...
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1answer
28 views
Cordless vacumn charger rating calculation
I got a cordless vacuum whose charger got damaged and I found a "close enough" replacement. What could be the new charging performance that I can expect or how can I do a calculation to determine the ...
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1answer
63 views
Questions on Inductor Selection guide from TI [closed]
I have been researching on Selecting inductors for Buck Application and came across an Application report from TI.
I have few questions which are listed below:
On ...
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1answer
96 views
Need some help designing a mains frequency converter (220v/50hz input, 220v/60hz output) for <$200USD
My main limitations here are with the amount of power needed, and of course the price. What I'm trying to do is to run a clothing dryer from the USA in another country, without burning out the drum ...
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1answer
72 views
Help Identifying a component for PCB repair
I'm helping a friend by attempting to repair this display PCB. It uses 24vac input and he accidentally hooked it up to 120vac.
I am trying to identify the two components in this picture under the ...
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2answers
224 views
Can a thermal fuse of a higher rated current be used safely?
I want to replace a 115°C 250V 2A thermal fuse used in a fan motor. The only fuses available locally are 115°C 277V 15A. Can I use the higher current rated thermal fuse?
Since it is a thermal fuse, I ...
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3answers
167 views
Reversing P-channel mosfet for polarity protection component selection
Situation: I'm trying to implement a reverse polarity circuit using a p-channel mosfet and a voltage divider using a resistor + schottsky diode. More information here if you need a refresher.
The key ...
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4answers
485 views
Choosing an FPGA based on ADC sampling rate
I have a project involving an ADC sampling at 500 MHz. I need to take this ADC data and boil it down into something a cheap CPU can process. I believe this is a good application for a low-grade FPGA, ...
1
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1answer
41 views
Resistance transform
Is there a circuit either passive or not that can transform the value of a resistance with a fixed ratio ?
For example if the input resistance to the circuit is 5000 ohm and the ratio is 50:1 , the ...
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2answers
74 views
Help selecting a NPN transistor
Looking to use a relay with ardiuno but having a hard time trying to figure out what transistor I need to use, all the tutorials I can find always use an example transistor (usually 2N2222) to figure ...
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3answers
204 views
Add constant DC voltage to a variable DC input
I'm designing a PCB and I need a voltage rail, roughly 3 volts above the main input (of 3 - 30V). This rail is to power some CMOS devices, so it won't need to supply much current.
Currently I plan on ...
16
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2answers
2k views
Parallel RAM without large number of pins?
Back in the 1970s, Texas Instruments had a now-discontinued range of products that they called GRAM (and read only equivalent GROM) which was basically a standard memory chip with address and data all ...
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101 views
Identify this circuit symbol with two overlapping circles [duplicate]
I came across some images of schematics and have never seen this component before - what is it?
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100 views
I want to make a heating element
I am going to buy a nickel-chromium wire for my heating element.
I want to power it with one li-ion battery (20A 3000mAh)
Intuition tells me that 84W (Draining the battery to its limit) might be ...
0
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1answer
35 views
SC16IS740IPW alternative - want DIP housing [closed]
I am working on Infrared receiver based on Vishay's TFBS4711 and I've added SC16IS740 Single UART with I2C-bus/SPI interface for simplyfing communication with ...
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0answers
66 views
What characteristics should I look for when choosing a Zener Diode as a voltage limiter?
I am trying to use voltage limiting zener diode for a MOSFET gate in the following oscillator circuit . (related to this question)
What characteristics should I look for when choosing a Zener Diode ...
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1answer
77 views
Design an SMPS to provide 5V – Transformer [closed]
I'm trying to design an integrated IoT device that will replace standard light switches. Currently I'm using a Switching Power Supply from eBay: HLK-PM01, just to have an working prototype. Now I ...
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1answer
69 views
Efficient electronics components [closed]
Imagine budget is not an issue and you are asked to design the most efficient circuit. With efficient, I mean that the power used to perform the functions is used solely for that and is not dissipated ...
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1answer
41 views
Is multi channel transceiver capable of receiving simultaneously from multiple transmitters?
We are in the process of designing a system that requires transmission of data from a sensor nodes to receiver at processing node.Later on,the receiver node can send(transmit) certain commands/...
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1answer
111 views
What are the uses for a water soluble IC socket?
I recently stumbled across water soluble IC sockets after being given a bag of them. While they do dissolve successfully from the board, I can't seem to come up for a valid explanation for why anyone ...
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3answers
59 views
BU2505FV - Can I use SPI with this part?
I am planning to use the BU2505FV DAC in my design and to communicate with it using SPI.
Is the 3 Wire interface described in the datasheet compatible with SPI? The DAC expect 14 bits to configure ...
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1answer
61 views
Reverse Search NTE
Is there a way to reverse search the NTE site?
I would like to plug in an NTE part number and see the equivalent vendor components. This would give me access to example circuits and development boards....
6
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3answers
126 views
Design of a switchable dual voltage power supply
My project would benefit from power supply with two modes selected by a switch. The 'normal' mode is full voltage (±13.5V) at full current (~5A), the 'high' mode is double voltage (±27V) at half ...
0
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1answer
52 views
Which transistor and resistor(s) do I need to hook up the FSA-410BT smoke alarm to Raspberry Pi's gpio?
The documentation for the smoke alarm: http://cms.dsc.com/download.php?t=1&id=16756
When the alarm is going off, this device draws 25mA (max) and idles at 20µA. It's 12v too, and I'm sure that ...
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1answer
69 views
Strange issue with custom 18650 tester
Ive made my own 18650 cell tester that:
Fully charges -> fully drains -> partially charges
It takes 4 cells, measured independently of each other.
While testing the drain circuits (charging circuits ...
1
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3answers
128 views
In the given circuit, will the resistor have current across it?
Since the higher potential is connected to ground, how would the circuit behave?
When the ground is removed, it turn out to be a simple circuit. But, upon addition of the ground at point G, the higher ...
2
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4answers
716 views
Jitter in 'ppm' and 'ns'
In many datasheets clock tolerance is in ppm and in some other it is in ns or ps. What is the difference in giving clock tolerance in ppm and ns/ps. How it can be converted from one unit to another?
3
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1answer
113 views
Selecting an inductor based on schematic
I am trying to integrate a Waveshare e-paper display into my design using their published schematic:
It calls for a 68uH iron core inductor, L1. After searching DigiKey for 68uH iron/ferrite core ...
3
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2answers
295 views
How to pick a capacitor to adjust loop compensation caused by reactive load?
I do wish to add a voltage regulator between a Li-Ion battery pack and a 36V 220W rated mid drive pedalling assist motor with integrated controller. The caps of that controller have a 63V rating.
...
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2answers
428 views
import PCB components into KiCAD which are sold in the electronics industry
When drawing a schematic in Eeschema Editor in KiCAD, there is a button to "Run CvPcb to associate components and footprints", so a schematic symbol on the *.sch file can be associated to a physical ...
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1answer
55 views
First or last value checker component/funtion [closed]
I am trying to make a circuit that can store the first and last value from a series of values. To do this I'm guessing I need a component to determine if it's the first or last value and this is what ...
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5answers
93 views
Is there an electrical component for something between a button and force sensor? [closed]
I'm currently involved in a college team design project and we're creating a "dance" floor that can be switched on and off by stepping on a plexiglass tile.
I'm looking for the best way to gather an ...
3
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3answers
218 views
Two mosfets, one digital pin
Im new to use of mosfets.
If I was to use two Mosfets with an Arduino, would I be able to drive them both with just one digital pin connected to both mosfet's gates but opposite actions?
For example:...
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1answer
139 views
Extra external components for lm2596 [closed]
Hi guys i have a very simple question, im very new to electronics so keep that in mind.
I got an off brand lm2596(eboot brand from amazon), and could not find the datasheet for it. I found ...
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1answer
118 views
Mass producing my electronics/raspberry-pi idea - What are the steps? [closed]
Could somebody tell me what the rough steps would look like? I think I have a good idea. I have put things into practice, and it's working and so on, but it's very ugly.
I guess, first I would have ...
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1answer
56 views
How do you toggle a DC current on/off with a input?
I'm new to circuitry and am planning on making a 12V DC circuit soon. I'm currently making plans & getting supplies, and was just wondering if there's some sort of component that would not allow ...
0
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1answer
124 views
Id ceramic disc capacitor [closed]
The mither in-law asked me if I could fix the OLD electric moulinex beater...
Once open I saw that both CDC's connecting the brushes are broken. I am having trouble identifying them, could you help? I'...
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0answers
33 views
Successor of VTI's SCP1000 Family of Absolute Pressure Sensors
VTI's SCP1000 product family is a range of ceramic capacitive pressure sensors that have reached the end of their lifespan. It has been suggested that certain sensors designed by others (like Bosch ...
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1answer
95 views
Selecting the proper mosfet
This is my first time asking a question here, so please be gentle?
I understand the theory of how mosfets work, but I'm having a lot of trouble deciphering all of the data sheet terms, to pick the ...
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1answer
629 views
NEC “MPC 1003C” chip
I am restoring an old ROTEL turntable and have come across a "NEC MPC1003C" chip, acting (I think) as voltage regulator. I can not find any information on the internet. Does anybody know any info on ...
