Questions tagged [component-selection]
All related to methods to select the correct components and/or component values to specific applications
1
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3answers
58 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
votes
4answers
250 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
vote
1answer
40 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
71 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 ...
0
votes
0answers
64 views
Flat ribbon cable voltage rating
So most flat ribbon cables are rated for 300V or less. I need a cable rated for 600VDC or more. First, if anyone know of any such cables that doesn't cost a fortune, please let me know.
Anyway, I ...
1
vote
3answers
121 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
votes
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
votes
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?
0
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0answers
90 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
31 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
votes
0answers
57 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
votes
1answer
49 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 ...
-5
votes
1answer
67 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
votes
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
106 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
votes
3answers
55 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
vote
1answer
41 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
votes
3answers
111 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
votes
1answer
49 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
vote
1answer
66 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 ...
1
vote
3answers
119 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
246 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
76 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
282 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.
...
1
vote
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
votes
2answers
263 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
votes
1answer
48 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
votes
0answers
34 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 ...
1
vote
5answers
89 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
158 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
votes
0answers
84 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
votes
1answer
89 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
votes
1answer
109 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 ...
-4
votes
1answer
53 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
votes
1answer
120 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
30 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
votes
1answer
87 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
vote
1answer
384 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
votes
2answers
75 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
160 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 ...
1
vote
2answers
118 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
votes
1answer
147 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
votes
2answers
391 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
votes
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 ...
2
votes
2answers
3k views
Altium - Cannot Select/highlight components on PCB
this issue arises out of no where periodically. Very frustrated!!
Suddenly I am unable to select any component on the PCB board in order to move it/right-click (the grey box doesn't appear).
I have ...
4
votes
3answers
362 views
How to select step-down converter chip? [closed]
I have some limited amateur-level electronics experience, but I'd like to try something new to me. I'm trying to design a small PCB that among some other fairly simple components will house a DC-DC ...
2
votes
2answers
264 views
Why must this capacitor be a “low leakage” type?
I was reading this article discussing non-inverting opamps and when presenting the above single-rail opamp circuit it gave the following not regarding capacitor C2:
Capacitor C2 type: It is ...
0
votes
1answer
172 views
Is this an SMD Pulse transformer? [closed]
I have two of these units. The one that looks fried actually worked just with some cleaning, and the other one won't power up. I check all the SMD Transistor and resistors and I am getting power to ...
0
votes
2answers
135 views
Getting CL of XTAL
I'm using a dsPIC30F4011 in my project and I want to put a 6MHz XTAL between OSC1 and OSC2 pins. The circuitry goes like this:
I want to know the values of C1 and C2 in the circuit, and I read ...
0
votes
3answers
139 views
“Sniffing” into a Boiler's LED panel (Central Heating)
I've built an esp8266 based web thermostat to control my heating system. Everything seems to be working fine for the moment :)
What I want to accomplish is "sniff" or intercept the boiler´s status ...
