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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Use of hpcompac desktop computer internal speaker for mobile phone audio output [on hold]

My hpcompac desktop computer is dead but internal speaker is working I want to use this speaker to listen songs on my mobile phone, any suggestions?
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26 views

Does anyone have Instructions for building a barcode reader wand? [on hold]

I want to build a barcode reader from parts on hand. (I have working barcode readers at least three in the room) I want it to be a simple project that I can use for teaching or make fairs. Years ago I ...
2
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2answers
169 views

LED capable of either IR or visible light (not at the same time) [on hold]

I'm looking for a type of LED (or some other small light emitter) with two modes: IR light only Visible light, if it also emits IR light here it doesn't really matter Could something like an "RGB ...
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0answers
56 views

What is this component (copper package)?

I found the following items in a box of random discrete components. Each item has 3 leads all he same length with a machined copper package cylindrical in shape. They must be pretty valuable items ...
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1answer
46 views

Which MOSFET is best for me? [closed]

I plan on driving a heating coil of about 1.4 Ohms from a 3-4V power source; which gives an current draw of 2.14-2.85 A. So Watts from the following info is 6.42-11.4 W of power. The MCU will output a ...
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0answers
46 views

How are Operating Temperature Bands Determined?

Manufacturers like Maxim, Altera, and many more seem to adhere to a commonly defined range of temperatures for applications. For instance, Full military (-55°C to +125°C) Automotive (-40°C to ...
2
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0answers
22 views

How to set the offset for the componets name in Eagle Schematic?

I am using Eagle 7.1.0. In the eagle schematic the componet name is started by default by 1, 2, 3..... How can I create an offset so that it starts from diffent value. for eg offset of 100, should ...
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2answers
49 views

Component naming conventions [duplicate]

Some very common parts have standard acronyms on schematics: resistors are usually named R#, capacitors C#, and integrated circuits U#. Is there a typical standard for these names? If I want my BOM ...
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2answers
103 views

Find Information On This Component Of Fire Alarm

I have been trying to search for information on the component of a fire alarm that sounds the siren. My goal is to remove the siren and use the power and ground to connect to an arduino. I want the ...
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6answers
2k views

How do you document your hardware design decisions?

How do you document your hardware decisions in the design phase? How do you avoid having to ask yourself the following questions while reviewing an hardware design that you made in the past: Why did ...
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1answer
48 views

How to choose a replacement DC power connector

I am making a replacement logic board for my 3D printer, since the original board kersploded and the manufacturer won't replace it as the printer model is 3 years old (...). The original power supply ...
6
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4answers
222 views

Is there a sensor that is equivalent to a dry toothpick?

For the non-cooks in the audience the dry toothpick test is used in baking (cakes, banana bread, etc.) to determine when the item is done baking. The procedure is to stick a toothpick into the food, ...
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2answers
43 views

Identity of electronics component needed

I can not figure what the white colored component labeled "5W3K9J" is. The "3K" part seems to indicate a 3K resistor. Could some one please verify this. Thanks giv
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1answer
38 views

Salvaging TMP36 [closed]

Looking to scavenge a tmp36 off of some fried electronics, would anybody have any leads on where to look for this type of sensor. I normally wouldn't mind to buy one, but I live in a pretty remote ...
0
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2answers
82 views

Use expensive or inexpensive capacitor for decoupling

I'm in the middle of a project to create a small development board using a 100Mhz Cortex M4 MCU and have to buy some decoupling SMT capacitors. I've found the following options: Cheap 10 cent from ...
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1answer
46 views

Optical coupler and splitter difference and explanation

Internally, what is the difference between an optical coupler and an optical splitter. If I have an input A on a 3db splitter, creating outputs B and C, can I send signals on B and C and have them ...
0
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1answer
48 views

How can I make an optical circulator? [closed]

I need to a single mode 1550 optical circulator at my lab. I have a varied supply of components, but no circulator. Any idea how I can make one myself? Perhaps using coupler and isolator? Thanks. -D ...
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3answers
57 views

What is this component? D5SV17

What is this component? Can someone link me to an equivalent replacement, haven't been able to find anything D5SV17
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4answers
1k views

Do components have an un-used lifespan?

Lets say for example, that I had a box full of transistors, resistors, capacitors, diodes, leds, this and that, and left it in a cool, average environment for lets say... 50 years. Do these ...
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3answers
113 views

What are these gray boxy components with R50 written on them? (Photo attached)

My motherboard came gradually to a complete death and I'm trying to figure out if one can repair it by fixing some capacitors like in the old days. I went through all the arrays of caps as well as ...
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0answers
38 views

Power Inductors in Eagle Software

I want to add the following product into my design in Eagle however I can't find the correct component from the library: ...
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2answers
52 views

Basic 12v LC Filter for Video noise reduction

I'm very new to electronics and I want to build a basic LC Filter with a 12v regulator and below is my basic schematic. Now i'm sure its incorrect but I want to know why and what i'm missing so I can ...
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2answers
70 views

Can I feed lower than rated voltage?

I'm poking around on eBay for some capacitors to use in circuits which I'm working on and see that they have a rated voltage. After some quick research, I found that going over the rated voltage of a ...
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2answers
217 views

How can I tell if a given MOSFET can be fully driven by 5V TTL high signal? (what should I look for on the datasheet?)

How can I tell (by reading the datasheet) if a specific MOSFET can be turned fully on (with the minimum drop) with simply 5V on the gate? (assuming 5V or 12V potential between the drain and source). ...
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3answers
206 views

How to find out if a microprocessor is powerful enough

Everybody knows its easy to develop a proof of concept for an embedded device on a rasbperry pi or even a PC, although when it comes down to choosing a microprocessor for your product, it is difficult ...
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1answer
46 views

Permanent ON/OFF tactile switch [duplicate]

I am looking for a small tactile switch that works like: press once -> turn on, press again -> turn off I only found this model http://www.adafruit.com/products/1683 , but i am looking to buy ...
13
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4answers
2k views

Is it worth reusing old components

I find myself constantly trying to recycle old components in my new projects. Yesterday, I needed a demultiplexer so I just took it out from some old phone board... Demultiplexers cost basically ...
6
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3answers
418 views

Use Cases for an External ADC

Most Microcontrollers (uC) have an Analog to Digital Converter (ADC) as part of their peripheral set, which is phenomenal as this integrates two components into a single package. These ADCs are ...
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1answer
39 views

Sourcing An Image Sensor? [closed]

I'm wanting to create a basic digital camera, I have most of it figured out... except for the image sensor itself. Looking in the normal places (digikey, mouser), I'm finding some very basic, low ...
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1answer
76 views

How to test Solid State Relay Testing

I am a newbie to electronics and hope someone can help. I am looking to test a SSR for my own experimentation to see if I understand this correctly. I have a SSR for 120 AC. (I am not plugging in ...
0
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2answers
94 views

MCP602 alternative?

What can I substitute in place of the MCP602 in the following circuit? It is a pulse rate detector.MCP601/2/3/4 are not available where I live. I have attached the relevant instructable and the MCP602 ...
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1answer
112 views

Unknown part from an old television [closed]

I found this in an old television. I'm very curious as to what it is. Please enlighten me! I'm thinking, some kind of over-voltage protection?
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2answers
307 views

Need help for identifying components

I have bought a shocking gum which gives a small electric shock when you pull a side, like this one : http://img.weiku.com/waterpicture/2011/10/31/20/Shock_Chewing_Gum_634577515693532881_3.jpg I ...
2
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1answer
152 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 ...
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1answer
42 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 ...
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0answers
37 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 ...
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0answers
50 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
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1answer
48 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
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3answers
406 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 ...
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1answer
62 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
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1answer
66 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.
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0answers
87 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
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0answers
89 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 ...
7
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1answer
808 views

What is the component on the schematic indicated by the symbol of a diagonal rectangle with a line through it?

I can't for the life of me, figure out what these diagonal rectangles are... Help?
4
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4answers
231 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
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1answer
77 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
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1answer
138 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
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1answer
78 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
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3answers
189 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
129 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: ...