Questions tagged [component-selection]

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

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2answers
63 views

How to calculate total amperes in two component circuit?

I have two components, a fan and LED strip, that I want to drive with the same power source. Both the fan and the strip are labeled 12 Volts, So I'm pretty sure I need exactly a 12V DC power source ...
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2answers
111 views

Using old components stored in a damp cold shed for decades?

I have tons of never used electrical components like resistors, capacitors, coils, transistors from 10 years back and tons more of my fathers stuff (made in the Soviet Union) from 20..30+ years back. ...
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1answer
76 views

Deformation of PTH component pins during handling

The PCBA drawing specifies 4.23 mm standoff for a PTH component. Now we encounter deformation issue of the pins during handling due to being slightly touched by operator. Is there any improvement for ...
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2answers
304 views

How to design/build the electronic part of a hybrid (liquid + electronic) multi tube manometer

I am in the early stages of designing/building a multi tube manometer for a DIY wind tunnel. For those not familiar with what a manometer is, it's a pressure measuring device, and looks something ...
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1answer
2k views

BTA16 absolute maximum amperage at 220/240V 50hz and impact of snubbers on resistive loads?

Using a BTA16 600CW3 triac with the arduino uno with the following schematic. Can it derive a 1.5 ton Air Conditioner and what is the absolute maximum amperage and power it can handle safely at 220/...
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0answers
147 views

What is the official name of this item?

I have purchased this item locally in the past and basically its 5 wires aligned in parallel, and makes my circuitry much easier (eliminates the needs to manually connect 5 individual wires side-by-...
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1answer
54 views

Electrical Requirements and Current/Voltage Ratings [closed]

Good afternoon everyone. I need to purchase PCB components and I need to make sure I have the right idea. A little background. I will have a socket connector embedded in plastic, running from end ...
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1answer
1k views

How to choose equivalent transistors for replacement

I'm working on replacing some power transistors in an old power supply. One of the transistors that I need to replace is an old MJ900 pnp power transistor with a newer close to equivalent one since it'...
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2answers
460 views

Boost converter component selection

I want to design discrete boost converter with 5 volt input and 24 volt output with load current of 1 amp. How do I choose suitable input and output capacitor and inductor values; what formulas are ...
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1answer
545 views

A component type called voltage release

There is an electrical component called voltage release, and shunt trip release . what are those and what do they do?
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1answer
114 views

Cable Size Measurements

I need some help in order to select the right cable for a design that I am working on, given that this cable is a 100 m long, able to handle 5.5 MW and a Voltage of 400 V. I need a formula or a ...
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2answers
4k views

LTSpice - How to specify the component model name through .param directive

I have some subcircuits that I want to define as components, but still be able to specify the component models used internally, for a much quicker testing of the design's performance under different ...
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2answers
53 views

I am looking for some advice on motor/motor controller?

I am planning to create a rig to check my wheel speed probes. I am going to mount a gear and rotate it with an appropriate motor/motor controller. Unfortunately I don't have much experience ...
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1answer
788 views

What capacitor type is best for low tolerance and thermal stability?

I am repairing an old tube-powered audio signal generator (HeathKit AG-9) and want to replace the old wax/paper capacitors that control the frequency of the oscillator circuit. The unit uses a bridged ...
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1answer
527 views

Simple Reverse-polarity Protection for Automotive DC-DC Converter: FET or Diode?

I have recently decided to upgrade my old van by installing a few 5V/3A sockets using a 100W 12V-to-5V downstep buck that has no reverse-polarity protection. A little bit of searching here and ...
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2answers
196 views

How do I find compatible coax connectors if I don't know the type of coax?

I have some small diameter coaxial cable, which we use in harsh environments. I want to buy connectors for it. Most suppliers list thousands of connectors by cable designation, so finding compatible ...
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2answers
247 views

Reliability of edge connectors for production

I'm looking for an 6 pin .1 standard edge connector to program for production my board without any connector. And I cannot find the number of cycle they can support. Does anyone has used such ...
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1answer
165 views

Passive components swapping and replacement

I am trying to writte a small note for our staff when they purchase components. Quite often some resistors, capacitor, inductor, diode and transistor (NPN and MOSFTET) may not be availble on the ...
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3answers
354 views

Best way to get components for a new electronics lab [closed]

I recently joined a lab that is still in the process of getting set up. Our approach to acquiring electrical components (e.g. resistors, caps, opamps, etc.) so far has been to just wait until we ...
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1answer
3k views

Power consumption of Cortex-M7-based microcontrollers

I'm designing a USB-powered microcontroller board, and I'm considering choosing a Cortex-M7-based microcontroller for it (I want a double-precision FPU, along with other features M7 offers). Currently,...
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2answers
585 views

When to “wind-your-own” vs “scavenge” a transformer?

I often see answers for one-off designs including the advice, "Just wind a transformer...." Like it's no big deal. Did I miss a class in which they handed out a sheet listing the formulas for core ...
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4answers
742 views

Selecting passive components [closed]

I am in the case where I read a lot of datasheet and I quite often see some circuit where the chip manufacturer indicate some value for resistors and capacitor but by not indicating any part number, ...
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2answers
86 views

What is this component called

Suppose I have 512 leds in a 16 by 32 grid. I want to control what is displayed on the grid. To do this suppose I have a timer counter that is constantly counting between 0 and 31 in binary. This ...
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7answers
938 views

Role of Electrolytic Capacitors and whether they can be replaced by Film capacitors in battery operated power converters

In battery operated power converters such as motor controller ( half bridge or full bridge ) bulk capacitance is placed across Vdd and Gnd . I thought this was unnecessary since the input is DC and ...
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2answers
508 views

High voltage DC current measurement by inductance?

I'd like to incorporate a few permanent ammeters in a 600V DC circuit. I've found all sorts of nifty panel ammeters, both analog and digital, but most are rated to less than a tenth that voltage. I ...
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3answers
101 views

Is it OK to use electronics with slightly different ratings? [closed]

e.g. is it ok to use a 464R instead of a 470R (where the circuit indicates 470R). Here is the circuit: I figure it "should" be OK be OK since it difference is roughly 1% but I thought I should ask.
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1answer
351 views

RJ45 Magjack connection

my doubt TXP,TXN of phy chip is connecting to P1 and P3 of the connector. I thought it must connect to P4 and P6 of the connector. Can somebody please let me know which is correct point 1 or 2 ?
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1answer
177 views

Help choosing component values for a relay delay circuit

I want to build a circuit that controls a relay with the following specifications: the relay should turn on and stay on for ~60 seconds after the button is pushed the relay should stay on as long as ...
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1answer
3k views

How to choose an op-amp used as a buffer [closed]

I am having difficulty choosing an op-amp for essentially a one-off design. All I am trying to do is buffer inputs to a +/- 10V 16 bit ADC. Super high precision is not necessary, but I would like to ...
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5answers
1k views

What's cheaper & faster for my lab, keep a stock of electronics components or order? [closed]

We are four electronic engineers working in a company, and we have a lab, I think we have a logistic issue with our components, this might be a basic study case: We have few racks with resistors, ...
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2answers
282 views

Need help selecting a replacement thermistor

I have a used piece of equipment (basically a specialized laminator) that uses a thermistor to measure the temperature in operation. When I got it, I found that it was heating, but the system never ...
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1answer
54 views

Any suggestions on how to make a current limiting circuitry? [closed]

I am a student of Electrical Engineering and I am currently working on a biomedical device which stimulates a human arm through functional electrical stimulation technique. Now for instance, if short ...
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1answer
2k views

What's the typical way to manage components for a team in Altium? Component libraries in a vault? SVN Database? Other?

I'm an EE for a growing company, and I'm looking for what's typical to manage components across multiple designs. When I say growing, I mean that there used to be one EE, as of last year I got added ...
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1answer
156 views

Miniture bluetooth enabled accelerometer with API or SDK [closed]

I'm getting into electronics as a hobby. For my first hobby project I want to build something like a super simple fitbit. To achieve this I need a bluetooth enabled accelerometer. I've had a look at ...
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2answers
223 views

Manufacturer doesn't list self resonant frequency

To put it simply, some manufacturers don't list their inductors' self resonance frequency. I'm a bit baffled as to why they don't do this, and I have some concerns using inductors like this one on ...
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1answer
153 views

Decoupling Capacitor Calculation

I have few questions related to the schematics(BBB_SCH) sheet 2 in link There is a bulk decoupling capacitor of 10uF,10V connected to the pin ...
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2answers
253 views

Why do offline switching converters often use discrete rectifiers for bridge?

In conjunction with my independent study of switching converters using textbooks, I am more or less obsessively tearing apart all the low-ish power (say 5 - 25 Watt) switching converters I can find. I'...
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3answers
1k views

how can we make a signal out of a 2 pin mic output

ok im looking to make this type of setup so that i can use its output pin to read via analog. this is the mic i got and would like to make that 3rd pinout which as you can see it only has 2 and this ...
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2answers
518 views

Mechanical Switch in parallel to the Micro Controller working in Sync

Here is the image for my requirement,want to operate Load Lamp of 230V AC with Mechanical Switch in parallel to Controller where one can 'ON' the Load Lamp from the Mechanical Switch and 'OFF' from ...
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6answers
2k views

How do I plan a long range product with microcontroller that needs long term support?

I need to use a microcontroller on a system that must stay working without major changes for a long time (decades). To ensure that there always will be replacement parts, I need a microcontroller that ...
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1answer
53 views

I want to know when the AD9235BRUZ-65 outputs data? I can't make sense of the datasheet or find a way to simulate it

I need to know when data is output from the AD9235BRUZ-65 digital pins. I need this to create a type of handshake with a FPGA. Datasheet.
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1answer
816 views

Is NXP's PCA9548A compatible with TI's TCA9548A?

I am using TI's TCA9548A in my Projects, but I would like to know if I can substitute it with PCA9548A from NXP. By comparing the datasheets this seems to be indeed the case, but I am wondering why ...
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2answers
180 views

Is there a typical 'ferrite' for use in a PCB?

I have a circuit diagram that I am trying to replicate (actually the Teensy 3.0/3.1 circuit diagram shown here https://www.pjrc.com/teensy/schematic.html) and there is a component called simply '...
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2answers
318 views

In a circuit with the TI TPS61165, how was D2 chosen?

Looking at datasheet for the TPS61165, I don't see how they chose D2 - it looks like it will only work if the voltage supply is above 12v due to this diode, but the chip's input range is 3-18v. I ...
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1answer
116 views

Volume of sand in a cat box - ultrasonic sensor?

My cat is always making fun of the sand that is inside of his sanitation zone :) In order to better control the amount of sand that is present on the container I'm developing a communications circuit ...
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1answer
98 views

Advice needed: comparing two parts

I want to buy some 0402 SMD capacitors (well some is about 1 to 10k). I always use the method of use the cheapest part for the given specs approach. But today I ...
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4answers
8k views

In production, is there a significant difference between QFN or TQFP components other than space?

When producing a run of PCBs, does it matter if I choose QFN or TQFP components? Say, I want to have 1000 boards manufactured with an Atmel AVR that is available in QFN or TQFP packages. The QFN ...
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3answers
873 views

How do I simplify microcontroller-based prototype into a sensible production-like circuit?

First some context: I'm an IT person by trade, and I dabble in electronics as a hobby. I have rather limited experience - apart from some toy circuits I've only made a single "production" quality ...
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2answers
396 views

Is there any reason to prefer one MLCC manufacturer over another?

I'm specifying some SMD chip capacitors for the first time and I note there are several manufacturers out there: muRata, Yageo, Vishay, AVX, Kemet in particular, perhaps others. Is there any good ...
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3answers
739 views

Selecting a capacitor for use in feedback loop

I'm designing a DC Lab Power Supply; the voltage regulation circuit looks like this: I'm developing the BOM, component by component, and next in line is specifying the capacitor in the feedback loop ...

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