All related to methods to select the correct components and/or component values to specific applications
0
votes
1answer
30 views
SC16IS740IPW alternative - want DIP housing
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
38 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
38 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
64 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
81 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
53 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
39 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
99 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
47 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
114 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
96 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
51 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
271 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
56 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
172 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
43 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
32 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
86 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
119 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
70 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
67 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
101 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
52 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
114 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
24 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
81 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
227 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
69 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
98 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
112 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
119 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
389 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
620 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 ...
0
votes
0answers
83 views
Sizing DC Circuit Breaker
I'm setting up a system that has 3 different DC rails powered by 3 different power supplies. I'd like to get a circuit breaker to put on each rail to proctect the power supplies, but I'm having issues ...
1
vote
2answers
2k 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
295 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
207 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
170 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
98 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
130 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 ...
-2
votes
1answer
57 views
Re: AD9279 Board Redesign! [closed]
Has anyone worked with the Analog Devices AD9279 board?
If yes, please help me regarding this issue. We are trying to make a new ADC board of our own (to reduce the size of the board by removing ...
0
votes
2answers
80 views
Resistor ladder network component name
Very basic question I'm sure
I am trying to buy components for a project I am doing, but I cant get the name of a component right yet.
But it has to exist somewhere.
I want a resistor array but ...
-1
votes
1answer
149 views
Why choose an 8bit over a 32bit MCU [closed]
With the recent Cortex-M rage, there seems to be a lot of 8bit bashing going around.
I was wondering what specific use cases engineers encountered where 8bit MCUs were the preferred choice over 32bit,...
2
votes
3answers
308 views
Resistor Power Rating and headroom for AC circuit
Background
I'm going to put together a resistive load, to load a 100W source with an \$8\Omega\$ or \$16\Omega\$ resistor. I'm finding that when to use peak, peak-to-peak or RMS values of voltage, ...
2
votes
1answer
84 views
Difference footprints of part in Altium Designer
What is the numerical difference between footprints marked with "* _M", "* _N", "* _V" and "* _L"?
P.S. I was looking any information in google, but as a result nothing.
1
vote
2answers
326 views
help identify the part number from the marking of SOT-23 components
I want to figure out the part number of the following components all (SOT-23) from a 20 year old PCB i am trying to fix , it is coated with conformal coating , but i scratched the top of these ...
0
votes
1answer
33 views
Are there methods to get the modulo of a variable voltage, with reference to another (constant) voltage?
If, for example, one has an input voltage of 5 Volts, and one wants to obtain this voltage modulo 3, as:
$$V_\text{out} = 5\mod 3\text,$$
then how does one perform this operation using simple ...
0
votes
4answers
471 views
How to convert a range of 0.5 to 4.5V for a range of 0~3.3V? ACS712 20A current sensor
The exact part number is ACS712ELCTR-20A.
Considering it is supplied at exactly 5V, it's output will present 2.5V when there's no current flow on its main pins. Output offset = VCC/2.
As its ...
