Questions tagged [component-selection]

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

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27 views

Design of 3-phase frequency inverter based on IC FAN7388MX

I have never tried to understand nor design a 3-phase frequency inverter before, but now is the time to do it. I am attaching here my initial schematic in PDF. It is based on IC FAN7388MX produced by ...
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1answer
53 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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2answers
40 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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35 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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67 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
42 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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1answer
82 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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3answers
118 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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3answers
48 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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1answer
49 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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235 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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49 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
18 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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2answers
16 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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47 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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37 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
52 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
50 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
62 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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50 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
87 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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80 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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97 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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170 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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104 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
85 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
64 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
44 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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2answers
56 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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1answer
41 views

Is the value of the inductor important in chua's circuit?

In Kennedy 92, the author gives a worked example of Chua's circuit experiment. The circuit diagram is given below: The author (in section 7.1) discuss how the value of each component might be chosen, ...
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165 views

Are there PCB connectors capable of suporting more than 3.5kV of working voltage?

I was thinking of a design for bringing VCC+ and GND to a board through a PCB connector. VCC = 6 kV. It comes from external source towards a banana jack within a metal case. The first idea was to fit ...
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2answers
17 views

In-line series identifier (eg. fixed bit flash) component

I'm looking to make a necklace of "charms", each having a different shape and containing a WS2812B (an individually-addressable RGB LED using a PWM-based single line protocol in series). One of the ...
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2answers
69 views

Working on a design that requires a specific kind of physical switch [closed]

The switch my design needs behaves like the picture below. The user would slide the switch to the right to activate it and the switch would return to the left automatically, I assume by some kind of ...
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53 views

Volt knob with consistent current

I need a device that can maintain the current of an variable electrical signal while manipulating current and overall power. Example 10a 0-24v 0-240w. And the theory behind a device which will work ...
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54 views

“Solder PCB” or “Flying Lead” high voltage connection for a reed relay model?

I'm searching for the HV reed relay solution for channels multiplexing printed board design: V < 6KV, I < 10mA. 8 relays that connect 8 input pins to V or GND (given for an external supply ...
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1answer
54 views

PTC thermister value

I am trying to find out specifications of a thermister on which "10P" is printed. Its resistance at room temp. is 18 Ohms when the circuit is power off. How can I find out its specifications? This is ...
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139 views

3.3V LDO Selection

If you've ever tried to find an appropriate LDO for your project you may have noticed the incredibly vast range available on the market. During my searches, I discovered this particular regulator ...
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1answer
50 views

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
47 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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35 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). ...
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1answer
217 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
75 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
61 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
73 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
127 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
90 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
710 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
34 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
100 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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