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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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Power a light only when 2 powered inputs

I have a 200 W, 12 V auxiliary light that I intend to mount to the rear of my car. I only want this light to switch on when there is power going to both the tail lights (headlights are on) and the ...
Baibro's user avatar
  • 131
6 votes
1 answer
330 views

Selecting an opamp for a voltage follower circuit using a LTspice simulation

Consider the following circuit: simulate this circuit – Schematic created using CircuitLab It is used to supply a 6VDC device (represented by R3) with a 12V car battery. More context on why ...
Juicer's user avatar
  • 377
0 votes
0 answers
32 views

Power selector for 12V car battery and Li-Ion

I am currently using the following power selector circuit (based on this Microchip app note) to switch between a 5V (5V5A) supply and a Li-Ion 3.7V battery (...
Dan Alvarez's user avatar
0 votes
1 answer
91 views

Bridge Rectifier Dimensioning for SMPS

I want to know how to dimension a bridge rectifier. As an example,in a SMPS, the bridge rectifier has repetitive peak current, up to 10A at rate of 100kHz, but in a small period of time, like a small ...
IMorimoto's user avatar
0 votes
0 answers
51 views

Replacing MAX485ESA IC into a RS485 module but not working

I have been struggling a lot with a MAX485ESA IC I bought from aliexpress. What I want to do is replace the component from a rs485 module. For some reason they don´t work and I was wondering if anyone ...
user2808169's user avatar
-2 votes
1 answer
40 views

Selection of diode and transformer for a 1500 W magnetron [closed]

I have a 1500 W magnetron. What diode and transformer can I use for it?
Erfan Mozafari's user avatar
0 votes
0 answers
59 views

How to deal with very high current to DC motor

I am using a pickup truck starter motor to build a small crane-like loading arm. I want to control the direction of rotation using an H-bridge, however, when I turn on the mechanism the motor has a ...
R Ram's user avatar
  • 1
4 votes
1 answer
104 views

How does the "Multiplying Bandwidth" specification relate to a DAC output's maximum bandwidth

I'm struggling to understand what it means for a DAC to have a Multiplying Bandwidth of 200kHz. Does it mean that the max frequency component in the DAC's output cannot exceed 200kHz for reliable ...
Ninja Ron's user avatar
5 votes
2 answers
1k views

Do these low profile header pins have an alternative name?

I am recreating a proprietary PCB, which fits inside a plastic casing. It has these header pins with a very low profile plastic dividing piece (see photo with comparison to "standard" ...
Mark Tickner's user avatar
1 vote
3 answers
79 views

Selecting PNP transistor replacement

In my circuit I have a discontinued transistor listed here: If I can not select a transistor rated 350 mA, would a change to the collector current pose any issues that may need compensating in my ...
Wes Ellgass's user avatar
0 votes
1 answer
88 views

How to select a MOSFET? [closed]

I'm overwhelmed by all the MOSFETs available. I'm trying to duplicate the effect of an SI2302, so an N-channel MOSFET, and specifically one that can be operated by an ESP32 logic level input (I think ...
Merlin83b's user avatar
0 votes
1 answer
35 views

VBPW34S vs BPW34S-Z key differences?

I have a circuit for detecting frequencies in light noise. Its a reverse bias mode circuit where the photodiode is coupled to a trans-impedance amplifyer circuit via a ceramic capacitor. I use it to ...
Mickrige McMahon's user avatar
0 votes
1 answer
101 views

Small Speaker with High dB. Loud enough?

I need a compact speaker suitable for a 16mm diameter tubular enclosure. The speaker must be capable of playing voice audio clips with sufficient clarity and volume to be easily hearable and ...
exile97's user avatar
  • 299
0 votes
1 answer
44 views

Gate driver selection for digitally controlled via PFM, LLC resonant half bridge charger

I am designing a LLC half bridge charger. I am going to use a microcontroller to control the switching frequency, with feedback from the output to smoothly control the switching requency. I don't ...
MSB's user avatar
  • 27
0 votes
1 answer
202 views

SMD resistor rotation on tape and reel

Background While resistors are obviously non-polarised, from a manufacturing point of view they might not be rotationally symmetric: specifically the labelling of 0805 SMD resistors. My board was ...
jonathanjo's user avatar
3 votes
1 answer
789 views

Will capacitors that are connected between GND and Vcc to a CPU impact the capacitance between the same pins on other components?

I am working on a pcb that has to have a CPU with capacitors between its gnd and vcc pins, other components like sensors also have to have capacitors connected to them for whatever reason indicated ...
maths soso's user avatar
2 votes
1 answer
71 views

MOSFET for Vgs(on)

How can i get the Vgs(on) if the datasheet like the VN10LM don't have that specification. I only can se the values of Vgs(th) and Id(on), but I still mess the Vgs(on) to resolve the ecuation K = Id(on)...
Clarence Gabriel Reinoso Javie's user avatar
2 votes
1 answer
255 views

Are there any Schottky-diodes that can replace the ones on this PCB?

I want help with finding Schottky-diodes to replace the ones on the PCB bordered in the red rectangle. They are probably non-working as they failed the continuity test with a multimeter. I have two ...
Max Frambuesa's user avatar
0 votes
0 answers
58 views

Wire to board component ID

I need help identifying this component. It is used to attach wire or ring terminals to the board. The screw is an M4x10 for size reference. The pad width is roughly 10mm. It seems to be a "U ...
emd014's user avatar
  • 1
5 votes
2 answers
1k views

What is this component? It looks like a rectifier with 149k as identifier

It looks like a rectifier with "pec" as manufacturer and 149k as identifier. I am trying to look up the datasheet.
user avatar
2 votes
0 answers
32 views

What are the common package names for pin spacing in multiples near 50-mils?

I'm looking for component package names that are known to provide conductors on (nearly) 50-mil spacing so it fits well on a 50x50mil SMT protyping board. I know SOIC are 50-mil, and even SOT-223 is ...
KJ7LNW's user avatar
  • 2,056
2 votes
4 answers
2k views

Help finding a circuit for discharging a high voltage capacitor

I am on a college project where we make F1 style cars for competitions. Ours is an electric car using a 588 V(maximum) battery to drive the motor. The inverter has a capacitance that, by the ...
Gabriel Corrales's user avatar
0 votes
1 answer
82 views

Heating device needs alarm

I am making a heating device prototype using an M12 battery and a 12 V diesel glow plug. As you might imagine, heat is a problem. In this case however, because of my set-up, the heat problem I have ...
Rick DuRapau's user avatar
0 votes
1 answer
206 views

Interpreting the markings on transistors - convention to differentiate/identify part numbers vs manufacturing details vs. other data?

General line of questioning: When looking at transistor, are there any standards/conventions of how they are labeled? Is it manufacturer specific - and if so, how would I identify that mfr's ...
JCReardon's user avatar
1 vote
0 answers
31 views

How transmit and receive work from the same antenna and pin for RFD900?

I'm currently using the RFD900 SMD version for an avionics bay for long range GPS capabilities. I have read the datasheet and saw this: The RDF900ux(-SMT)/868ux(-SMT) modem has two antenna ports and ...
Lucas Webb's user avatar
0 votes
1 answer
40 views

Substitute for MAX865EUA-T [closed]

It's been few weeks I'm searching for a substitute for my MAX865EUA-T (datasheet). I need a component able to do a +10V/-10V output with a +5V input, this component was perfect for me since it's ...
Bibibou's user avatar
  • 55
0 votes
0 answers
52 views

Choosing capacitors for Buck Converter – How many Electrolytic, How many Ceramic?

I am working on a high-power buck converter. This converter will be powering a purely resistive load (it’s a literal resistor – a heating element). However, I am having some issues deciding how many ...
Kuba0040's user avatar
0 votes
1 answer
91 views

LTspice MOV tutorial/help

I am looking at the availability of the pictured component on LTspice and cannot find it when I type it in the component library search. Please let me know the component symbol name or if I need to ...
displayname6810's user avatar
0 votes
1 answer
88 views

Need help in choosing parts for a pcb [closed]

I am trying to get a PCB fabricated and assembled from PCBWay for a project, but I have little experience with electronic components. The project schematics don't have specifications for some of the ...
Parham's user avatar
  • 3
0 votes
1 answer
128 views

Altium Placement Button Unaccessible

I'm trying to place a component in Altium from the Manufactur Part Search panel to my schematic, however the place button is greyed out. I can't place my chosen component, or any of its alternatives. ...
Berry Cherolds's user avatar
1 vote
3 answers
154 views

Component/Footprint selection in EAGLE for PCB designing

I'm a beginner and I want to build a basic PCB using EAGLE software. I want to only use SMD components but I have few doubts while using EAGLE: I want to design a PCB schematic by using standard ...
Ashish1313's user avatar
2 votes
2 answers
289 views

Selecting the proper resistors in a bi-directional level shifter?

How do you calculate the values of R1 and R2 in the circuit for a Bidirectional Logic Level Shifter if the high and low voltages are known? Searching on the Internet I found 10K is a good option to ...
Bob R's user avatar
  • 263
0 votes
0 answers
81 views

THT resistor at high frequencies

Experimenting with radio frequencies (50-150 MHz) I found that parasitic inductance of resistor can cause problems. Reading about resistors technologies (THT) seams that the parasitic inductance of a ...
gino's user avatar
  • 499
0 votes
1 answer
242 views

What components can be used as an alternative to vibration motors?

I am building a project that will vibrate at certain times. The item being vibrated is 300-700 grams (still working out the material). It needs to be a noticable vibration (like a phone vibration), ...
Jonesome Reinstate Monica's user avatar
1 vote
1 answer
277 views

Searching for a replacement part for an SSD repair

I broke my SSD after applying 28 V and I have to change the component by the red arrows in the picture. The component is marked "FNC1B" and it is QFN10 package. It should be a MOSFET or an ...
123 456's user avatar
  • 25
1 vote
1 answer
418 views

SSD with Phison PS3111 controller repairing [closed]

I broke my SSD after applying 28 V and I am trying to repair it. But need a description of a component that is marked red in the image. I guess it is a fuse or something like that. Could anybody ...
123 456's user avatar
  • 25
0 votes
2 answers
69 views

Can a vertical multiwatt package be bent to lie horizontal after it is installed?

I am working on a project with a multiwatt package audio amplifier IC. Can this component be bent over to lie horizontal, flush with the PCB, after it is soldered into place?
Emmett Palaima's user avatar
0 votes
0 answers
127 views

Determining values for active low-pass output filter for DAC

I'm trying to use a PCM1780 as DAC for my audio circuit. The datasheet shows the following recommended output schematic for this DAC, for which I'm trying to choose component values (because they do ...
Pelican's user avatar
1 vote
3 answers
130 views

DC-DC boost regulator selection question (TPS61230A) [closed]

I am a product designer self-learning electrical engineering, not an electrical engineer. In trying to design a wearable device, I've run into some difficulty in selecting a DC-DC boost regulator. The ...
Michael.G's user avatar
1 vote
1 answer
102 views

How to find low DC leakage capacitors?

In some refdesign I'm following (for PoE), they ask to a 1nF capacitor to earth/chassis (not GND). One of the global design constraints is to maintain DC-resistance of at least 20M between all ...
Sandro's user avatar
  • 7,697
9 votes
3 answers
1k views

Is there a connector for 0.1in pitch linear hole patterns?

For programming on most of my larger PCBs I include a 0.1in pitch 1x5 header. For prototyping this is great because I can connect my programmer to it directly. However for production I could eliminate ...
Drew's user avatar
  • 7,119
4 votes
4 answers
719 views

Will a ceramic capacitor work for a class-B amplifier output?

I am working on a project that uses a basic class-B amplifier design for lo-fi audio output (just plays some clicks and beeps through a small speaker as UI sounds). Here is my schematic: For ...
Emmett Palaima's user avatar
0 votes
1 answer
249 views

Using transceiver between DALI and microcontroller

Does anyone have experience using a transceiver between a microcontroller and DALI bus? Please see the attached wiring diagram. I am not sure what is wrong with the circuit, but when I measure the ...
Mickolini's user avatar
0 votes
0 answers
124 views

Choose right capacitors for flyback design

Would like to build an flyback inverter from 12V to 100V power 250W. The 12V source is a rectified generator. I'm struggeling with the right primary capacitor selection. I calculated a ripple current ...
JBtowerway's user avatar
0 votes
1 answer
129 views

How to understand MOSFET "turn on" times?

Consider this circuit: simulate this circuit – Schematic created using CircuitLab Ignoring the different threshold voltage, the (time domain) simulation shows a clear difference between Q1 and ...
Matthew's user avatar
  • 572
0 votes
0 answers
521 views

Replacement of a MOSFET alternative

This is the MOSFET part that I'm using in the current design - LP0701 Can the NVJS4151P be the right alternative for the LP0701? I am not sure as some parameters do not match. My requirements : 500 ...
user avatar
3 votes
2 answers
1k views

What can I do about components with inadequate creepage?

I'm designing a device for use in a non-climate-controlled environment (garage, shed, etc.) If I understand it correctly, this puts me directly into pollution group 3 unless I can also engineer it to ...
Matthew's user avatar
  • 572
1 vote
1 answer
561 views

(Another) how do I choose an appropriate TVS for a relay?

I've seen questions about selecting TVS diodes before (for example, How to choose the correct TVS diode and how to size it?; there are others, but they aren't about TVSs for protecting relay coils). ...
Matthew's user avatar
  • 572
1 vote
2 answers
313 views

TRIAC dimming using MOC3021 but light is flickering

I m using a BTA12/BTA136/BTA139 for dimming using MOC3021 with zero cross detector circuit using interrupt pin of the controller, but after some time the light is flickering or the TRIAC is damaged. ...
Jaimin's user avatar
  • 69
3 votes
0 answers
47 views

How to verify if SDRAM alternative is a direct drop in replacement?

I'm trying to verify whether the two SDRAM chips are complete drop in replacements of each other. I've verified the footprint, electrical characteristics and various timing parameters (namely CL, tRCD,...
goofson's user avatar
  • 51

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