Questions tagged [component-selection]
All related to methods to select the correct components and/or component values to specific applications
321
questions
2
votes
1answer
73 views
Step up 3.3V to 5V to use as power of op-amp
In my previous question I was thinking about how can I "reuse" this circuit (0-10V, 0-20mA and digital contact input), when I only have 3.3V regulated power available from my LoRa Node:
...
0
votes
2answers
93 views
What is the purpose of this thing on NiMH rechargeable batteries ? Can't figure out what this component is or its purpose
What is the purpose of this thing on NiMH rechargeable batteries? I can't figure out what this component is or what it is for.
I'm trying to change the batteries in a Hoover automated vacuum cleaner.
...
0
votes
0answers
30 views
Refurbished TLE-5206 [closed]
I recently purchased the Tle 5206-2G to control a motor with 4A starting and current in use of less than 200ma, the component is for 5A DC or 6A peak (with internal limitation, it shuts down for 25us ...
1
vote
5answers
497 views
Understanding MOSFET characteristics
I am trying to select an n-channel MOSFET to switch a 12 V power rail. The use case here is to switch on/off a couple of LEDs which are wired in series. The LEDs (datasheet) can draw a maximum of 700 ...
-1
votes
2answers
46 views
How can i make this circuit to switch between two terminals? [closed]
I want to make a circuit so that with a push of a button(hardware one of any kind) i can switch this
to this
Using micro-controllers is also an option just as a passthrough
0
votes
1answer
79 views
How can I reduce the number of microprocessor pins I need to use?
In my circuit, 5 choices are made by the user through jumper.
Please look at the picture:
I have to use 5 pins of microcontroller in this method.
How can I reduce this number of pins?
Is there a ...
0
votes
1answer
57 views
Need help determining if a component is acceptable for use in a production design
For the sake of not going too broad, I am only referring to this single OLED LCD board component from Newegg being used directly within a prototype device that I have designed. My end goal is to take ...
1
vote
2answers
76 views
MOSFET Selection criteria considering conduction losses, switching losses and working frequency
I am trying to choose a suitable MOSFET for my full-bridge resonant converter for wireless power transfer. The circuit topology is something like the following. Specifications: rated power \$-~500 W\$...
0
votes
0answers
51 views
Choose of components for a rgb led strip
I'm pretty new to electronics. I have some basics from my student life but it is not much.
I want to progress in it and the best way for me is to do it with a project.
Anyway, my goal is to power a ...
0
votes
1answer
70 views
How would I build a data acquisition system for SiPMs?
I try to build a radiation detector using of an arrangement of silicon photomultipliers (SiPMs) coupled to a scintillator and I want to read out the number of photons recorded by each SiPM sensor. I ...
0
votes
0answers
43 views
KA336 replacement parts
Can you replace a KA336 with a TL431 directly?
I have a circuit board with a broken KA336 and I can't find it here in my country, not even the LM336. It is a 2.5V shunt regulator.
The adjust pin on ...
2
votes
1answer
63 views
Help Getting Chip Part Number, Logic-Driven DIP 12V/24V Power Control
I am planning a future project, but I need the ability to have a 5V logical high enable a 12 or 24V source from an external supply, in a standard DIP package. I remember using something exactly like ...
0
votes
0answers
28 views
Estimation of Electrolytic Capacitor ESR at SMPS Frequencies
While working on compensation networks or ripple calculations, it helps to know the ESR for my output capacitors. In high voltage SMPS systems, this seems to be difficult for the following reasons:
...
0
votes
1answer
42 views
Voltage Limitations of a header being used as a voltage selector
I have an application that takes a reference voltage. These voltages could be considered 'low voltage' as they range from 0 to 1000 V. Below is a reference schematic of what I'm trying to accomplish, ...
6
votes
4answers
1k views
Allow an analogue signal through unless a digital signal is present
Does a component exist that allows an analogue signal through until it receives a digital 1, then allows that digital 1 through? As an example:
Analogue sine wave going 0V to +5V is only input, ...
0
votes
3answers
55 views
Can't tell which pin is hot and which is ground on connector datasheet
I want to use the following bnc connector: 1-1634612-0 by TE Connectivity.
I am looking at the datasheet but I can't tell which pin goes to ground and which pin I connect to get an input. I linked the ...
0
votes
0answers
34 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
64 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
votes
0answers
52 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
34 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
112 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
25 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 ...
2
votes
1answer
73 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
365 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
48 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
98 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
votes
0answers
125 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
votes
0answers
22 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
votes
0answers
35 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
214 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
votes
2answers
66 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
291 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 I’m 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
367 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
votes
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
318 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
247 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 ...
2
votes
1answer
48 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
105 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
132 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
78 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
67 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
73 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
129 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
47 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 ...
3
votes
1answer
68 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
56 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
votes
0answers
76 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 ...
