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Questions tagged [component-selection]

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

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62 views

Fusible Resistor Calculation

How do we calculate the value of fusible resistor used in the input side of a capacitive power supply. The supply produces an output voltage of 5V DC. I want to add the fusible resistor (RT1) to ...
8
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1answer
285 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 ...
0
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1answer
28 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 ...
1
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1answer
57 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 ...
2
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1answer
93 views

Need some help designing a mains frequency converter (220v/50hz input, 220v/60hz output) for <$200USD

My main limitations here are with the amount of power needed, and of course the price. What I'm trying to do is to run a clothing dryer from the USA in another country, without burning out the drum ...
2
votes
1answer
67 views

Help Identifying a component for PCB repair

I'm helping a friend by attempting to repair this display PCB. It uses 24vac input and he accidentally hooked it up to 120vac. I am trying to identify the two components in this picture under the ...
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2answers
142 views

Can a thermal fuse of a higher rated current be used safely?

I want to replace a 115°C 250V 2A thermal fuse used in a fan motor. The only fuses available locally are 115°C 277V 15A. Can I use the higher current rated thermal fuse? Since it is a thermal fuse, I ...
1
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3answers
106 views

Reversing P-channel mosfet for polarity protection component selection

Situation: I'm trying to implement a reverse polarity circuit using a p-channel mosfet and a voltage divider using a resistor + schottsky diode. More information here if you need a refresher. The key ...
6
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4answers
329 views

Choosing an FPGA based on ADC sampling rate

I have a project involving an ADC sampling at 500 MHz. I need to take this ADC data and boil it down into something a cheap CPU can process. I believe this is a good application for a low-grade FPGA, ...
1
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1answer
41 views

Resistance transform

Is there a circuit either passive or not that can transform the value of a resistance with a fixed ratio ? For example if the input resistance to the circuit is 5000 ohm and the ratio is 50:1 , the ...
0
votes
2answers
72 views

Help selecting a NPN transistor

Looking to use a relay with ardiuno but having a hard time trying to figure out what transistor I need to use, all the tutorials I can find always use an example transistor (usually 2N2222) to figure ...
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3answers
168 views

Add constant DC voltage to a variable DC input

I'm designing a PCB and I need a voltage rail, roughly 3 volts above the main input (of 3 - 30V). This rail is to power some CMOS devices, so it won't need to supply much current. Currently I plan on ...
16
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2answers
2k views

Parallel RAM without large number of pins?

Back in the 1970s, Texas Instruments had a now-discontinued range of products that they called GRAM (and read only equivalent GROM) which was basically a standard memory chip with address and data all ...
2
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0answers
101 views

Identify this circuit symbol with two overlapping circles [duplicate]

I came across some images of schematics and have never seen this component before - what is it?
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0answers
95 views

I want to make a heating element

I am going to buy a nickel-chromium wire for my heating element. I want to power it with one li-ion battery (20A 3000mAh) Intuition tells me that 84W (Draining the battery to its limit) might be ...
0
votes
1answer
33 views

SC16IS740IPW alternative - want DIP housing [closed]

I am working on Infrared receiver based on Vishay's TFBS4711 and I've added SC16IS740 Single UART with I2C-bus/SPI interface for simplyfing communication with ...
0
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0answers
61 views

What characteristics should I look for when choosing a Zener Diode as a voltage limiter?

I am trying to use voltage limiting zener diode for a MOSFET gate in the following oscillator circuit . (related to this question) What characteristics should I look for when choosing a Zener Diode ...
0
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1answer
65 views

Design an SMPS to provide 5V – Transformer [closed]

I'm trying to design an integrated IoT device that will replace standard light switches. Currently I'm using a Switching Power Supply from eBay: HLK-PM01, just to have an working prototype. Now I ...
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1answer
69 views

Efficient electronics components [closed]

Imagine budget is not an issue and you are asked to design the most efficient circuit. With efficient, I mean that the power used to perform the functions is used solely for that and is not dissipated ...
0
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1answer
40 views

Is multi channel transceiver capable of receiving simultaneously from multiple transmitters?

We are in the process of designing a system that requires transmission of data from a sensor nodes to receiver at processing node.Later on,the receiver node can send(transmit) certain commands/...
4
votes
1answer
107 views

What are the uses for a water soluble IC socket?

I recently stumbled across water soluble IC sockets after being given a bag of them. While they do dissolve successfully from the board, I can't seem to come up for a valid explanation for why anyone ...
0
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3answers
57 views

BU2505FV - Can I use SPI with this part?

I am planning to use the BU2505FV DAC in my design and to communicate with it using SPI. Is the 3 Wire interface described in the datasheet compatible with SPI? The DAC expect 14 bits to configure ...
1
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1answer
46 views

Reverse Search NTE

Is there a way to reverse search the NTE site? I would like to plug in an NTE part number and see the equivalent vendor components. This would give me access to example circuits and development boards....
6
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3answers
116 views

Design of a switchable dual voltage power supply

My project would benefit from power supply with two modes selected by a switch. The 'normal' mode is full voltage (±13.5V) at full current (~5A), the 'high' mode is double voltage (±27V) at half ...
0
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1answer
50 views

Which transistor and resistor(s) do I need to hook up the FSA-410BT smoke alarm to Raspberry Pi's gpio?

The documentation for the smoke alarm: http://cms.dsc.com/download.php?t=1&id=16756 When the alarm is going off, this device draws 25mA (max) and idles at 20µA. It's 12v too, and I'm sure that ...
1
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1answer
68 views

Strange issue with custom 18650 tester

Ive made my own 18650 cell tester that: Fully charges -> fully drains -> partially charges It takes 4 cells, measured independently of each other. While testing the drain circuits (charging circuits ...
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3answers
124 views

In the given circuit, will the resistor have current across it?

Since the higher potential is connected to ground, how would the circuit behave? When the ground is removed, it turn out to be a simple circuit. But, upon addition of the ground at point G, the higher ...
2
votes
4answers
481 views

Jitter in 'ppm' and 'ns'

In many datasheets clock tolerance is in ppm and in some other it is in ns or ps. What is the difference in giving clock tolerance in ppm and ns/ps. How it can be converted from one unit to another?
3
votes
1answer
98 views

Selecting an inductor based on schematic

I am trying to integrate a Waveshare e-paper display into my design using their published schematic: It calls for a 68uH iron core inductor, L1. After searching DigiKey for 68uH iron/ferrite core ...
3
votes
2answers
290 views

How to pick a capacitor to adjust loop compensation caused by reactive load?

I do wish to add a voltage regulator between a Li-Ion battery pack and a 36V 220W rated mid drive pedalling assist motor with integrated controller. The caps of that controller have a 63V rating. ...
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0answers
58 views

500˚C IR thermometer from available 100-380˚C parts

All Digikey and Mouser available IR temperature sensors max out at 100˚C (analog) or 380˚C (digital). Is it possible to get these parts functioning at the 500˚C range? If so, how? I need a low cost ...
0
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2answers
345 views

import PCB components into KiCAD which are sold in the electronics industry

When drawing a schematic in Eeschema Editor in KiCAD, there is a button to "Run CvPcb to associate components and footprints", so a schematic symbol on the *.sch file can be associated to a physical ...
0
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1answer
49 views

First or last value checker component/funtion [closed]

I am trying to make a circuit that can store the first and last value from a series of values. To do this I'm guessing I need a component to determine if it's the first or last value and this is what ...
0
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0answers
37 views

Hardware to to simulate a poor-quality connection to a piezobuzzer

I have a piezo buzzer component that produces a clean tone after I connect it directly to a voltage source. I noticed while I'm making the connection, or I scrape the battery lead across the piezo ...
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5answers
92 views

Is there an electrical component for something between a button and force sensor? [closed]

I'm currently involved in a college team design project and we're creating a "dance" floor that can be switched on and off by stepping on a plexiglass tile. I'm looking for the best way to gather an ...
3
votes
3answers
179 views

Two mosfets, one digital pin

Im new to use of mosfets. If I was to use two Mosfets with an Arduino, would I be able to drive them both with just one digital pin connected to both mosfet's gates but opposite actions? For example:...
0
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0answers
112 views

Zener diode for eliminating dim LED mode?

I have an outdoor solar light that once it gets dark the LED's are powered at roughly 2.3v for 100% of the time, unless something triggers the motion sensor at which the LED's are bumped up to roughly ...
0
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1answer
121 views

Extra external components for lm2596 [closed]

Hi guys i have a very simple question, im very new to electronics so keep that in mind. I got an off brand lm2596(eboot brand from amazon), and could not find the datasheet for it. I found ...
0
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1answer
115 views

Mass producing my electronics/raspberry-pi idea - What are the steps? [closed]

Could somebody tell me what the rough steps would look like? I think I have a good idea. I have put things into practice, and it's working and so on, but it's very ugly. I guess, first I would have ...
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1answer
55 views

How do you toggle a DC current on/off with a input?

I'm new to circuitry and am planning on making a 12V DC circuit soon. I'm currently making plans & getting supplies, and was just wondering if there's some sort of component that would not allow ...
0
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1answer
124 views

Id ceramic disc capacitor [closed]

The mither in-law asked me if I could fix the OLD electric moulinex beater... Once open I saw that both CDC's connecting the brushes are broken. I am having trouble identifying them, could you help? I'...
3
votes
0answers
32 views

Successor of VTI's SCP1000 Family of Absolute Pressure Sensors

VTI's SCP1000 product family is a range of ceramic capacitive pressure sensors that have reached the end of their lifespan. It has been suggested that certain sensors designed by others (like Bosch ...
0
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1answer
93 views

Selecting the proper mosfet

This is my first time asking a question here, so please be gentle? I understand the theory of how mosfets work, but I'm having a lot of trouble deciphering all of the data sheet terms, to pick the ...
1
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1answer
507 views

NEC “MPC 1003C” chip

I am restoring an old ROTEL turntable and have come across a "NEC MPC1003C" chip, acting (I think) as voltage regulator. I can not find any information on the internet. Does anybody know any info on ...
0
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2answers
78 views

Does tec1-12706 work reverse?

Is it possible if i connect one side of this sensor to hot surface and another one to a heat sink or something cold after that it gives current? I have a very hot surface about 300 (C) and want to ...
3
votes
1answer
191 views

Altium : how to delete vias and path that are outside of board

This might be a stupid question but I moved a room, resulting in some vias and path in negative coordinates. You can see below a 3D view. I would like to delete them but in 2D mode, I can't zoom out ...
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2answers
128 views

Signal path switching for effect circuits

I'm trying to build a method of switching signal order with three circuits in a rack unit. I've been researching different methods, using relays, using CMOS etc but I'm getting a bit overwhelmed and ...
0
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1answer
167 views

What is the op-amp in this JFET-matcher circuit?

In the circuit diagram on this page, there appears to be an unspecified op-amp. Could anyone guess at a component I could use for this and/or explain why there is no specification? Background: I am ...
2
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2answers
396 views

How to select the correct material for wire-wound resistors?

There are many resistors wires like nickel chrome wires, ferros chrome wire, nickel copper wires, etc. All the wires gives us the desired resistance in resistors. How can we select the best wires ...
0
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1answer
1k views

Choosing the value of an audio pot

I salvaged a motorized pot from a stereo receiver which I want to use between a CD player and a power amplifier (both devices sit on the same shelf at my workplace). Currently, the line out jacks feed ...