Tagged Questions

Components are the most basic elements in an electronic circuit. Characteristic is that they're in a single package. There are passive and active components, from as simple as a zero -ohm resistor to as complex as a multi-billion transistor IC.

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2
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1answer
119 views

Identifying a component symbol in a schematic [duplicate]

Problem: So I have ran across the following part and I simply don't know what it is. I tried searching for if you will a description of it. (I.E. two diodes on top of each other pointing opposite ...
0
votes
1answer
36 views

TPS54383 switching regulator components.

I'm trying to build a switching regulator using the TPS54383 dual output regulator, Now I've got most of the components and schematic figured out here. pdf Except the inductor's and diode; I'm ...
0
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0answers
46 views

Resistor/Capacitor kit binders [closed]

Does anyone know where I could find something like this, or even better, like this in the UK? The lab I work in has an inordinate amount of surface mount and other tiny components that I'd like to ...
0
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0answers
19 views

Trouble in proteus isis

I need to design a few components in Proteus. Due to complexity of the design ( and size of circuit), I decided to use the sub circuit feature. I made a block diagram of my design and edited its ...
0
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0answers
34 views

Good narrow beam, modulated IR sensor suggestions

I am looking for a narrow beam, modulated, digital IR sensor that can detect a distance of at least 10 cm (longer is better). I've talked to mouser and pololu and they were unable to leave me in the ...
1
vote
1answer
44 views

Are there any single logic gates which are just individual components?

As the question says, I need a NOT gate for a simple Bi-Colour LED circuit. I do not want to use an IC with 6 or 7 integrated as I am only going to use 1, so it's just a waste. So, do individual ...
7
votes
3answers
354 views

Why are discrete four-terminal MOSFETs so hard to find?

I know that a MOSFET is a four-terminal device, but nearly every discrete MOSFET you can buy has its bulk/body/substrate internally connected to the source. Why is this? It makes it inconvenient to ...
-1
votes
1answer
57 views

Burned component help! [closed]

My central heating mixing valve is down... There is a clearly burned component, right next to the blue thing (capacitor). Can someone tell me what that is? Thank you
1
vote
1answer
60 views

Can't identify component

I was disassembling an old CRT monitor and I came across this component, but I've been unable to identify it. Can somebody help me with it? Thanks.
0
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0answers
49 views

How to read part number on a transformer? Inside Dell power adapter LA65NS0-00

I have a dell power supply that doesn't work anymore and am trying to salvage the parts: http://www.amazon.com/LA65NS0-00-Dell-Inspiron-notebook-Adapter/dp/B00115AOTA There's a transformer in here, ...
1
vote
0answers
73 views

What is this motherboard component that looks like a bead of solder [photo], and can it be repaired/replaced? [closed]

As you can see, the one on the top is burnt. Whenever I plug the power adapter into the wall, the component releases a puff of smoke and the adapter instantly shuts itself off. The damage to the ...
4
votes
1answer
724 views

What component is this?

I can't for the life of me, figure out what these diagonal rectangles are... Help?
2
votes
3answers
69 views

Which diode to use on my RC switch debounce circuit?

I am choosing parts to build an analog RC switch debounce circuit. I plan to implement the circuit described here: http://www.ganssle.com/debouncing-pt2.htm (see "An RC Debouncer"). These are the ...
1
vote
1answer
43 views

Identifying a four-pin IC labelled EL 8+7 G8025

I want to know the purpose of a component named "EL 8+7 G8025" which was found inside a Nokia charger.
0
votes
1answer
63 views

Additional current source for large LED-7-segment-display

I have two sets of LED-7-segs. Each with 4 Digits, all 4 inch tall. One set CC, the other CA. Combined they consume some smooth 1.68A / 1.4A according to the data sheets. That is manifold the ...
1
vote
1answer
49 views

Modify MEMORY component to more sensibly Load/Store value?

I have created the following electrical circuit using Logisim: My ALU takes in 2 8-bit values and performs the operation set forth by the [Op Setter]. In particular, when the [Op] code is [100], ...
2
votes
3answers
145 views

What is this component that is found in lots of phones?

I was taking apart an old phone (an old LG GM360). It was always a terrible phone. Anyway, I found one of these inside when I was tearing it down: I have also found some of these in the back of my ...
0
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1answer
78 views

Participation of DC component in total average power of signal

My task is to calculate participation (in percent) of DC component in total average power of signal from photo: I represented this signal as complex Fourier series: ...
0
votes
1answer
79 views

What determines the maximum rotational speed of a hard disk drive?

Through my background research I understand that the limit on the rotation of a hdd is largely the product of heat and the specs of the physical disk, but I am puzzled by the round numbers advertised ...
2
votes
3answers
285 views

Electronic component for tapping

I'm in need of electronic component that is able to be tapping, giving a type of massage on the skin. I did some search and can't find anything that is as big as the tip of the finger with the nail. ...
0
votes
1answer
76 views

What is this SB component on schematics

Is the SB19 component a "jumper" (0-Ohm resistor)? On the board itself, some of these are placed, and some aren't, leading me to believe that's what they are. There aren't any 0's on them, though. ...
0
votes
2answers
59 views

Building a first State Machine circuit - Technical Help

I just learned how to synthesize a diagram of a finite state machine into a diagram of a logical circuit composed of D flip flops, a clock and logical gates. However, I don't really have much ...
3
votes
1answer
88 views

What is this component in series with my water heater's thermocouple?

The other day we had our water heater go out and the issue was diagnosed to a faulty thermocouple. When the repair man removed the faulty thermocouple he noticed the following disk-like component in ...
2
votes
1answer
75 views

CadSoft Eagle polygon won't reach pads in Molex library

I'm using the Molex 5569 library in CadSoft Eagle. When I create a polygon, it won't reach the pads at all. The problem occurs only with components from this library. Have a look at this screenshot ...
0
votes
3answers
58 views

Where to find a discrete transmission gate

I have a project where I need to switch analog signals. Ideally, I would like to just use a few transmission gates to do this, but I cannot find anyone who sells or produces them! I've checked ...
11
votes
5answers
388 views

Why are MAX-, AD-, LT- parts (among others) so expensive?

I'm curious why some IC manufacturers like Maxim, Analog Devices, and Linear Tech's parts are so expensive? I know they are much higher quality (better electrical characteristics, etc), but for some ...
4
votes
3answers
332 views

How can one organize SMT parts prior to/during PCB assembly?

Suppose one is hand-assembling a board with many SMT components. Unlike THT, SMT components are often not labeled. This means that having two different kinds of parts "out" at the same time is a ...
4
votes
2answers
636 views

Why should one buy through digikey or element14? [closed]

I quite often find that digikey or element14 have quite expensive pricing for the parts, right now I'm looking for memory chips and compare it to ebay sellsers: ...
1
vote
1answer
57 views

PCB/SoC component licensing restrictions

Let's say I plan on building a consumer electronic system (some electronic product). This system would have a PCB and a plethora of various components: LEDs, transistors, resistors, light sensors, ...
0
votes
4answers
93 views

How important is “mm pitch” for a capacitor? [closed]

I want to repair my boiler, so I found this howto. He writes I need a MKP X2, 26.5 x 10 x 19 mm, 0.47 µF 275 V/AC ±10%, 22.5 mm pitch. The closet one I can find ...
3
votes
3answers
106 views

Selecting digital componentry in bulk [closed]

There are a ton of electronics retailers and suppliers on the internet, all selling components at (essentially) retail prices. But when big companies need to use digital components (batteries, ...
0
votes
1answer
96 views

Drum machine circuit diagram

I'm having trouble understanding this circuit. Can someone help me get through it? I'm trying to understand what the signal is doing from start to end but keep running into electrical deadlocks.
1
vote
2answers
108 views

What are quartz crystal oscillators?

I'm a beginner in electronics and I found two quartz crystal oscillators, each one has two pins. Their numbers are: sjc4.000a ee4.000 Is it possible to know the ...
0
votes
3answers
178 views

What is the component in bluetooth module

Last month, I bought a bluetooth audio module on eBay. And I wonder what components are on this PCB. In the picture, what is the component in the top red box? What is the component in the bottom red ...
1
vote
1answer
385 views

Identifying a 3-Terminal Component (probably some sort of magnetic device?)

I am trying to identify this component from a circa 70s AM/FM radio. It was attached to a flip clock, which makes me think that it is a magnetic device responsible for the "flipping" action of the ...
1
vote
1answer
86 views

Identifying this 6-pin power connector

I'm looking for a manufacture ID for this 6-pin SMD power connector. Anything will help, even a category to dig through on mouser/digikey/fanell. 2 Vcc 2 gnd 2 temp sensor
0
votes
1answer
72 views

Will the 595 shift register burn out if outputs are always high?

I'm working with a SainSmart 8-Channel Relay Module and I'm powering it via a 595 shift register via raspberry pi. The issue I'm having is that these sain boards activate the relay when the input is ...
0
votes
1answer
71 views

Center-tap Primary Coil Transformer

What is the function and possible applications of a center-tap primary coil transformer?
0
votes
1answer
66 views

FM Transmitter Amplifier — Maximum output power with non-customized parts?

I would like to build an FM transmitter on my own and I found a nice circuit that acts as a USB sound card to transmit low power FM signals. http://tipok.org.ua/node/35 My plan is to add another ...
1
vote
1answer
56 views

What does EMSE mean?

I'm currently trying to use EAGLE software and I'm trying to import a part called 'LT3022' which is a voltage regulator from Linear Technology. I've found a CAD library of LT products from element14 ...
0
votes
4answers
110 views

Components Expiration date

Do electronic components have an expiration date? How long does it take to components to go bad if we store them at room (normal) temperature and humidity? What components go bad sooner? (resistor, ...
1
vote
1answer
53 views

Need some help learning to make my own parts in Eagle

I am extremely new to using Eagle (or creating circuits in general). I've been searching around online for tutorials on making your own parts in eagle. However, I still have a few questions and I was ...
0
votes
2answers
99 views

How do you choose a diode for a 5v to 3.3v clamping circuit

I have a logic input that is 3.3v and I want to be able to allow it to interface with either 3.3v or 5v input signals w/o worrying about it being damaged. I would like to use a resistor with a ...
2
votes
2answers
163 views

Identifying this resistor/capacitor

I'm having trouble to identify this (presumably broken) part for replacement: It was used in a broken LED power supply, with 220-240 V AC on the input and 120-200V DC on the output. I suspect this ...
1
vote
2answers
76 views

Breadboard minimum lead length

What's the minimum lead length for a component in order to reliably connect with solderless breadboard contacts? Reading specs on cables, relays LEDs, and other components, what should I take as the ...
3
votes
1answer
163 views

Female-female connector, but what is it called?

Question What is the "official" name for this type of connector? (the large black box in the image) More info... I need the connection to connect two PCBs together as one was missing from a system ...
4
votes
5answers
892 views

Is it possible to make a complete analogy between electricity and something more graspable? (e.g. fluids)

A similar question has been asked here, but mine is more general. Here is the background: it seems to me that electricity is not so intuitive as it may sound. For example, many (unskilled, as I am) ...
0
votes
0answers
21 views

How do I specify a parameter for a specific component in LTSpice?

I have a schematic which uses two center-tapped transformers. I found that I can specify the ratio between the two sides of the transformer by adding the directive ".param ratioT=0.3". Now that I ...
0
votes
1answer
134 views

Where can I find a transistor similar to a 2n 3904?

I have what I believe is a 2N 3904 638 transistor. It measures 50MΩ at around 70°F. How can I find a data sheet on this? How would I go about finding a similar / replacement thermistor? PS: ...
5
votes
4answers
115 views

Export restrictions when sourcing parts for PCB assembly in foreign country

If a company has a PCB design and wishes to assemble them economically, a natural choice is China. Some Chinese companies are asking for the parts (or some of them) to be shipped to them. This means ...