Questions tagged [component-selection]
All related to methods to select the correct components and/or component values to specific applications
309
questions
0
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0answers
27 views
Heating a nichrome wire [closed]
I am trying to heat a nichrome wire with a DC output from a PC(not laptop) usb port. Or using any mobile charger. What components may I need to prevent any damages to my pc and charger and most ...
0
votes
0answers
29 views
Need mating PCB connector for Micro JST 1.25mm 2 pole Li Battery
I have spent hours to search for the mating connector fo the below battery connector.
Source: https://www.amazon.com/gp/product/B0867KDMY7/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
Image:
...
1
vote
1answer
59 views
How to continuously vary inductance in the range \$[-A, A]\$, A>0?
I require an inductor whose inductance varies continuously as a function of some parameter \$p\$, like a bias voltage or something else that is easily user-controllable (not frequency as I require it ...
0
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0answers
42 views
Is there such a thing as a (cheap) optocoupler with a non-polarised output?
Standard optocouplers have a polarised input and a polarised output, thus:
It is possible to get a coupler with a non-polarised input, thus:
However, what I require is an optocoupler with non-...
1
vote
1answer
31 views
Help find component - MOSFET
I have a old motor driver board, for which I don't know the current capability.
So I tried to find the datasheet of the MOSFET on the board.
But without success (Bing search in various variants)
This ...
1
vote
2answers
110 views
What sensors would be suitable for measuring masses of the range 0.5 g to 1g? [closed]
I am working on a project that involves measuring objects whose masses range from .5g to 1g.
Preferably looking for something small and thin but at this point, anything that accomplishes the task is ...
0
votes
1answer
23 views
Connecting iM881A-M to Arduino
I want to connect iM881A-M LoRa module to arduino.
And I want to ask which external parts I need to connect it.
In datasheet there are many parts that I think I don't need to use.
Please help me , I ...
1
vote
1answer
62 views
Sourcing Transformer with Specific Turns Ratio
I am looking at a building an electronics project that calls for a transformer with a specific turns ratio '1:4:50', and am trying to source a component. I am working on the project from this tutorial:...
2
votes
3answers
364 views
Controlling Z axis placement
What techniques are there for placing the components on a PCB at a desired height? e.g. so that potentiometers and switches can be both panel mounted and board mounted?
For example, are there adapter ...
0
votes
1answer
47 views
How to choose an appropiate antenna?
I want to increase the Bluetooth Low Energy transmission range of my ESP32 with IPEX connector.
How can I select the right antenna?
Do I have to take a look only at a 2,4 GHz WiFi antenna, the antenna ...
0
votes
1answer
94 views
What is the name of this component? 2 pin, white connector
I need to buy the male side of this pictured component.
It is in a Kokoon moon door bell, and is white with 2 pins.
From hunting around, it could perhaps be a 2.54mm JST-XHP JST connector. I purchased ...
0
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0answers
71 views
How To Source Transformer Component for Bug Zapper Circuit
I am looking at designing a small bug zapper circuit of the type described in this post: How does this mosquito zapper circuit work?
Here is an approximate schematic of what I am trying to build:
I ...
0
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0answers
21 views
MOSFET Selection based on peak drain current
While selecting a MOSFET for application how do we calculate the peak currents which can occur in the circuit?
I am designing a DC/DC interleaved synchronous Buck Converter (2 MOSFETS per rail) for ...
0
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0answers
31 views
RS485 Trancievers: ADM2483 VS ISO15
i'm actually doing some hardware selection about RS485 trancievers. There are a lot of different suppliers, drivers, etc...
So, i've selected these two trancievers: ADM2483 from Analog Devices and ...
3
votes
2answers
148 views
Is it better to use discrete components or voltage regulators for a variable power supply? [duplicate]
I'm a recent graduate EE student and this is my attempt to gain experience and strengthen my resume so I'm eager to figure this out. I'm designing a dual channel floating output bench power supply ...
0
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2answers
59 views
Why is component spread a figure of merit for analog filters design?
Sometimes I read that in analog filter design, component spread is a figure of merit. The lower the better.
What is the advantage (or disadvantage) of having a low (high) component spread?
The only ...
1
vote
1answer
174 views
Using 555 timer with soil moisture sensor
I am using an IRROMETER sensor for soil moisture measurement. This sensor requires AC excitation, so I found an interfacing module for it from online. This is the circuit recommended by them:
The ...
0
votes
2answers
49 views
Electric frequency conversion from very low frequencies
I have designs for diy home generator that at the scale Iām currently building will output a very small amount of power at a very low frequency, varying between <1 and ~2 hertz using 2 pole magnets....
5
votes
5answers
248 views
What kind of inductor for DC-DC converter module's EMC filter?
I'm looking at the datasheets for a number of switching DC-DC converters. They suggest for EMC filtering to add an inductor and a capacitor or two on the input side of the converter.
The question: ...
0
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0answers
26 views
Converting 110V AC to 12V DC [duplicate]
I am currently moving to a location for work that has a 110v electrical connection but no water connection. I was attempting to use an RV water pump in order to create a plumbing system for my sink ...
1
vote
2answers
167 views
Audio Capacitors - NP0/C0G or Film in Loud Enviornments
I hear a lot of "audio-foolery" going around about capacitors and I have always steered clear of multiplayer ceramic caps because I was under the impression that they are microphonic.
I am designing ...
14
votes
3answers
2k views
Why are these two electrolytic capacitors so hugely different in size?
I'm recapping a vintage amp, and that amp has two larger caps at 2200uF @ 50V. I have sourced some possible replacements, and I'd like some insight into why these are SO different in size, and how I ...
0
votes
1answer
101 views
What are these SMD components with 3 leads?
Full resolution link is here
I am trying to repair a vacuum fluorescent display module by Futaba model code is M402SD07GS. It is seen that there is no energy on the display and Vcc and GND legs are ...
1
vote
1answer
42 views
Soft start for a drone battery pack?
I want to design drone landing pad that will automatically begin charging my drone as soon as it lands, I'm planning on having the drone legs have some pogo pins that will touch the pad it lands on ...
1
vote
1answer
70 views
Suitable Replacement for a Dual Coil Latching Relay
After questioning about my broken thermostat there Debugging an old Thermostat: What component is this? (3 pins SMD IC), thanks to @JRE I could find that it was actually the relay on the board that ...
1
vote
1answer
77 views
Choosing inductor package for LC filter
I understand that one needs to consider inductance, current rating and self resonant frequency when selecting an inductor for an LC filter. But it seems like there are so many different inductor ...
1
vote
2answers
76 views
Search engine for popular parts [closed]
I'm using OctoPart dozens of times each day to check availability, pricing, specs, datasheets etc. However, I sometimes look for "popular parts", either when specs aren't that special or as a starting ...
0
votes
1answer
56 views
230V switch controlled by Arduino Uno (Atmega 328)
I need to realize a switch for an electric motor whose power supply is at 230V.
That switch must be controlled by Arduino with a certain square wave signal. If the voltage was lower, I'd build a ...
0
votes
2answers
60 views
Which device will allow me to simply capture 24v?
I'm new to electronics, struggling to work out whether this is simple and I'm missing something or whether it's a lot more complicated that what I anticipated.
I have something (some device) that is ...
0
votes
1answer
62 views
Capacitor Differences
Why would some circuit designers prefer a tantalum or a ceramic capacitor instead of the popular electrolytic ones? In circuit schematics, all capacitors are all the same. So what factors will be ...
0
votes
1answer
96 views
Why are there convex and concave resistor arrays?
I was wondering what is the history for having convex and concave resistor arrays.
Out of this EEVBlog entry and this Stackexchange question, the advantages of convex resistors are clear to me.
What ...
0
votes
1answer
46 views
Component / Circuit for variable resistance (0, 5K, 100K) at 110V and 1.5Amps @ 0Ohm
I am searching for a circuit or component, lets call it IC1, which can deliver varieieng resistance with zero capacitance for a power output.
When IC1 has 0 Ohms, there will be 110V and 1.5AmpsMax ...
0
votes
0answers
63 views
3-phase inverter - component selection / calculation help
Yes, this is a component selection / calculation topic, it can be considered an "ask".
Considering my current schematic and the following parameters:
supply = 100~240 VAC (nominal 220VAC and 127VAC ...
3
votes
1answer
61 views
Transistor cross reference with pinout
I need to find a replacement transistor. The only number I have to go by is a manufacturer (of the unit, not the transistor) part number from 1974 which of course leads nowhere. I know it's a ...
0
votes
2answers
51 views
Recommended high-PSRR LDO regulator? [closed]
I'm having a hard time finding a regulator that fits these constraints:
High PSRR (>80 dB @ 0..50 kHz), low noise.
Vin = 5.5V, Vout = 5V, IoutMax = 200mA. Dropout voltage preferably < 200 mV.
...
0
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0answers
99 views
Different markings, same thermistors?
I have three thermistors marked as follows:
SCK 053 (dark green);
NTC 5D-9 (black);
DSC 5D-9...
0
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0answers
74 views
How to prevent common ground circuits messing with each other
I made an Arduino based 18650 battery tester that has 4 identical circuits that charge and drain.
Testing one battery at a time gives one set of results which I deem to be correct but testing more ...
0
votes
1answer
47 views
Parameters needed to identify the correct capacitor
In a traditional power switching supply PCB like this one,
(source of the image)
ceramic capacitors are sometimes present as discrete components. They appear as:
(source of the image)
I would like ...
0
votes
1answer
306 views
Differences between 220pf 1000V capacitors
I need to replace a popped capacitor. Externally, it looks almost like
(source)
except for the first letter: in my case it is R and not ...
0
votes
3answers
122 views
What is the very basic electronic component to generate pulse wave (high or low) we commonly see in digital?
Very common we hear ON/OFF, HIGH/LOW, 1/0, or something similar in digital system. It is called binary. I would like to know what is the very basic component to generate such that binary system? I ...
0
votes
3answers
52 views
Effect of resistor on the attached circuit
I have a circuit board that I am trying to repair. I have identified that the following components are bad. ICS801 and RS816 (0.65 ohm resistor +- 5%). I could replace ICS801 but could find an exact ...
0
votes
1answer
59 views
Capacitor selection - effect of reducing size of the MLCC capacitor in an audio application
We are developing an audio application using the TI TLV320AIC3111 codec and we are referring to the EVM document for the same. On this document, they've used a couple of 47uF 1210 capacitors (pg 23). ...
6
votes
3answers
283 views
What are the common footprint naming conventions
This question is ultra verbose, but I'm doing this in an effort to help other newbies (like me at the moment) as they first get into a CAD program like eagle. In the past when I've been new to a field ...
0
votes
0answers
179 views
Proteus PCB layout components problem
I am designing the PCB layout but some number of components forming the group.
I can't able to use this component. I am not able to pick a single component.
I have attached the problem image below.
...
0
votes
1answer
23 views
Configuring TI TPA6138A2 for Single-Ended PWM Inputs
I'm looking to use the TPA6138A2 to ground-center, LPF, and amplify 2 PWM inputs (between 0Ā and 3.3Ā V). My desired LPF cut-off frequency is 18 kHz and I would like to use a digital potentiometer for ...
0
votes
2answers
17 views
Should Passive LPF/HPF Component Selection Depend on Ability of Input to Source Current?
When choosing R and C for a passive LPF or HPF, should you take into account the input's ability to source current? I'm currently working on a passive HPF for an input that can supply up to 10Ā mA @ 3....
0
votes
0answers
49 views
eMMC selection problem due to lifecycle
As you know while considering eMMC's lifecycle there are 3 technologies called SLC, MLC, and TLC.
But I could not understand exact speed of these. i.e. MLC's lifecycle.
Some say 3k like this one.
...
1
vote
1answer
39 views
Chip selection: Serial interfaces
I am narrowing the selection of an uC for my project and currently reading the datasheets. One contender is Microchips 'ATSAMC21*' series. Using the parametric selection tool I get following ...
0
votes
1answer
64 views
How to select external components for LM2596-3.3V?
I want to power an ESP8266-12F with a 12V power supply. The 12V power supply is also used to power a led strip. I need to step down the 12V to 3.3V. The maximum load is 1A.
I found the LM2596-3.3V to ...
0
votes
1answer
53 views
Sourcing oddball stacked USB-A connector
I'm looking for an oddball stacked USB connector to repair a piece of equipment. I can't use the standard form factor, because it won't fit into the enclosure properly.
I've gone through mouser and ...
