Questions tagged [component-selection]

All related to methods to select the correct components and/or component values to specific applications

Filter by
Sorted by
Tagged with
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
51 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
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
61 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
43 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 ...
2
votes
1answer
68 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
votes
0answers
84 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
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
votes
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
165 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
61 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
202 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
265 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
197 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
120 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
44 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
75 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
92 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
57 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
64 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
106 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 ...
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
votes
0answers
108 views

Different markings, same thermistors?

I have three thermistors marked as follows: SCK 053 (dark green); NTC 5D-9 (black); DSC 5D-9...
0
votes
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
48 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
367 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
296 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
211 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 0 and 3.3 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 10 mA @ 3....
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
67 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
55 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 ...

1
2 3 4 5
7