Questions tagged [component-selection]

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

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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 ...
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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 ...
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127 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 ...
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53 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 ...
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135 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 ...
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48 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....
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206 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: ...
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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 ...
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92 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 ...
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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 ...
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70 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 ...
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39 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 ...
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54 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 ...
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55 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 ...
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73 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 ...
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1answer
55 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 ...
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59 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 ...
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54 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 ...
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84 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 ...
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45 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 ...
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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 ...
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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 ...
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49 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. ...
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63 views

Different markings, same thermistors?

I have three thermistors marked as follows: SCK 053 (dark green); NTC 5D-9 (black); DSC 5D-9...
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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 ...
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1answer
43 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 ...
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161 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 ...
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120 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 ...
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51 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 ...
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55 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). ...
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56 views

How can I disconnect some wire connections automatically when a specific one is disconnected?

I have a selector switch that can select a 5V digital signal to the output or terminal C of the encoder to the output. It's simple so far. But my application requires that when I select digital signal ...
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258 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 ...
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115 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. ...
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1answer
20 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 ...
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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....
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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. ...
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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 ...
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1answer
59 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 ...
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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 ...
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2answers
68 views

Temperature Sensor Selection for temp range of 160C to 240C with 1C Accuracy

I am attempting to select a temperature sensor for a controlled heating application. The sensor will need to be inserted into a chamber with a cartridge heater and steel ball bearings inside of some ...
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56 views

Name of PS4 controller internal speaker connector

I just recently received a broken PS4 controller. The owner tells me the audio doesn't work and the analog are totally destroyed. I opened the case and, indeed, the audio connector of the internal ...
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3answers
168 views

Why use a concave vs. flat mating target for pogo pins?

I'm doing some research into using spring-loaded pogo pin connectors with a mating target for a project I'm working on. During this research, I discovered that there is a concave mating target, yet, I ...
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129 views

What is the meaning of 1N, 2N, 4N, 6N (and probably others) in the semiconductors name? [duplicate]

There are many discrete semiconductors with names like 1N4148, 1N4007, 4N35 or 6N137... And they can be produced by many manufacturers. So it looks like it is not a marketing names. Looks like 1N are ...
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101 views

Power supply circuit capacitor selection

I'm planing to use this circuit for my op amp test but I don't understand capacitor selection Why C1 and C2 selected 2200 uF but C3 and C4 selected 1000 uF? (C3 is 1000 uF picture is wrong) I tried ...
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1answer
310 views

What is the use of a capacitor in a DC motor circuit?

I'm trying to understand all the components I need in order to drive a DC motor through an Arduino. I saw this circuit below, which has a capacitor (other sources show same circuit but without the ...
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107 views

Need help to identify this component from an LED driver module

I got an LED driver module(LDM) from a truck that drives the headlight of the truck. The PCB has a strange component which I have never seen before. I have added a picture of that component. The ...
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1answer
114 views

Voltage multiplier - selection of values

I'm designing a circuit, which includes a voltage multiplier. The schematics of voltage multiplier is well known, but it usually appears without any specific values for capacitors and diodes: My ...
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2answers
100 views

Effect of output inductor DCR on switching power supply

I'm not an EE but I'm attempting to gain hobby levels of the skill. So I'm building a DC/DC power supply as an exercise. I built a PCB design for a TI chip (TPS560200) with associated passives based ...
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1answer
45 views

What can I do on the bench to determine if a power supply does or does not add back a PFC (Power Factor Correction)?

I'm given a AC to DC power supply with only the inputs and output specified. It was probably made after 2000, and the ENERGY STAR program mandate to add PFC correction to power supplies may or may ...
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57 views

working voltage and output levels of a logical gate chip

I would like to apply some digital gates to control 12V signals. Concretely I would like to invert some of them using this inverter chip inverters. But I would like to keep Vout = 12V. Controled ...

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