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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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 ...
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3answers
44 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 ...
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0answers
65 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 ...
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3answers
299 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
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2answers
574 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: ...
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1answer
53 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, ...
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4answers
71 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 ...
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3answers
105 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, ...
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1answer
68 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.
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2answers
76 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 ...
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3answers
142 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 ...
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1answer
377 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 ...
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1answer
76 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
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63 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 ...
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1answer
40 views

Center-tap Primary Coil Transformer

What is the function and possible applications of a center-tap primary coil transformer?
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1answer
46 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 ...
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1answer
55 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 ...
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4answers
102 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, ...
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1answer
30 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 ...
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2answers
73 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 ...
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3answers
133 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 ...
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2answers
62 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
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1answer
132 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 ...
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5answers
867 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) ...
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0answers
19 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 ...
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1answer
104 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: ...
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101 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 ...
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3answers
89 views

Is there some kind of jumper for banana plugs?

I have a three-phase cable harness (low voltage) for connecting to a motor. I have it connectorized so I can easily plug/unplug the motor. I would like to insert a short inline cable so I can measure ...
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1answer
80 views

Component usage in this constant-current source circuit

In the April 2014 edition of Elektor magazine, they present a circuit for a high-precision current source device (page 42). It allows the user to select a constant-current between 10nA and 20mA. They ...
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55 views

FM tuner/receiver chip with RDS and good audio quality?

I want to rebuild from scratch an old radio and put some modern technology in it. I want to put large (17x5cm) LCD instead of analog scale inside receiver like this: (image from audiofilek.pl) ...
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1answer
85 views

CX-20 Quadcopter Part

One of the ESC's on my quadcopter is missing a component. I am unsure what this component does or where to find a new part. Is it a sort of resistor?? What size? it features no markings that I can ...
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2answers
1k views

Why is there copper on the side of this package?

I'm searching around digi-key when I noticed one of the MEMS oscillators has these copper pieces on the edge of the package: I'm not talking about the pads, I'm just talking about those little ...
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2answers
53 views

Does “open source hardware” only apply to controllers or to all components?

I'm new to the hardware world and am coming from a software background, and am trying to build a small device to attach to my PC via USB. I've heard the term "open source hardware" in reference to ...
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1answer
130 views

Most lumens per watt

I recently started designing a pcb for flashing lights I want to use in a pavillon at festivals, garden parties and the like. Now my question is, can anyone tell me which kind of LED that has the ...
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138 views

Why do TI (Texas Instruments) graphing calculators not use TI chips? [closed]

Most semiconductor manufacturers seem particular about using their own products when possible. For example, the Analog Devices Blackfin development board uses another Blackfin processor for the JTAG ...
2
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3answers
568 views

What is this AC source?

Below is a part of a schematic and I would like to understand each part of it. What I think is happening: This is being fed a 48V AC source These leads are a source and a ground? I'm not sure ...
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2answers
86 views

What all do I need to salvage parts from gaming devices (not for profit) [closed]

I have a few projects I want to get started on (not for patent: only for me) I wanted to know what types of tools I need to get some components and other salvageable parts from things like a PS2 ...
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1answer
45 views

For two clocked components in series, how do you ensure that the output of the first is captured by the second?

I'm working through the open Nand to Tetris course offered by Nissan and Schoken. I've just finished chapter 5, where we construct a 16-bit computer using a hardware description language and an ...
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2answers
157 views

Suggestions for Ternary Computer Parts

I am thinking of creating a ternary computer from scratch, mostly as a hobby project, are there any parts out there that I could use? Or would I have to create them from scratch? If so, what would be ...
0
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1answer
85 views

What are these components in these circuits?

I have seen a documentary about making BGM-71 TOW (an anti-tank missile - the Iranians make it). You can see it in this link (part 1). I have seen two odd components. In your opinion, what are these ...
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4answers
1k views

Are more expensive parts worth it?

The prices of components of supposedly the same type and with the same parameters vary strongly between manufacturers. Assuming my use does not come close to the absolute maximum ratings, is it worth ...
0
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1answer
117 views

What are these parts? (better photos)

I have salvaged some parts that I can't identify myself. I would appreciate it if someone could tell me what they are called so I can look them up. I took some better photos of the first 3 parts, and ...
0
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1answer
63 views

Measure the current on shunt basis

I am trying to measure high current 15A to 20A 1000V. There are two ways of doing it: using hall sensor, that can interface directly to micro controller using shunt resistor based. I need ...
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3answers
173 views

Ways to connect a PCIe/PCIe2 card and other PC parts to a breadboard?

Basically I have a bunch of rather old computer parts that I haven't been able to get rid of so I decided to do a few experiments with them but for that I need to be able to breadboard them. Things ...
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2answers
167 views

2.1 speaker volume controller circuit problem [closed]

I dont know how to connect 4 wires coming out of speaker to the 3.5mm jack whick only has 3 wires in it.... I don't need volume controller. I just want to fix it so that it could work as a stereo ...
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0answers
63 views

Meaning of + and - in an electronic component's part number

I have search in the internet and I could not really get an answer for this question. "What does \$\mathbf{+}\$ and \$\mathbf{-}\$ mean in an electronic component's part number?"
2
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1answer
237 views

Identify this component on a DYP-ME007Y ultrasonic sensor

I'm working with the DYP-ME007Y ultrasonic sensor for a project and I bought two off eBay. Both seem to work however they have this 'unknown' twistable part which is in a different position of ...
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1answer
52 views

Are phone cameras interchangeable [closed]

I was wondering what determines the availability of a phone to support a camera? and if lets say I have an 8MP camera from one phone manufacturer with the same number of pins that would connect to ...
0
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2answers
156 views

Eagle library for MCP2551

I need to make a PCB, and the only software I have is EAGLE. All the other parts are listed in my libraries, but where can I find a library that has MCP2551 (CAN transceiver)?
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1answer
74 views

SMD Code Parts BE P04 & AE P04

I'm looking to find out what these parts are on a PLC controller. Both are SOT-89 packages. The AE P04 I suspect maybe something to do with a constant current circuit for +24vDC for a 4-20mA loop ...