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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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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28 views

AT Commands of OVC3860 bluetooth module [on hold]

Last month, I bought OVC3860 bluetooth audio module on eBay. I found its datasheet and AT Command sheet. I could communicate with bluetooth module by using AT Commands. But I couldn't find any ...
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71 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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0answers
54 views

Arduino: e-paper / e-ink displays? [on hold]

Experts, As I understand it it's commonplace to be able to get, for an Arduino, a small screen display, say TFT, indeed, with touchscreen incorporated. (Example http://www.adafruit.com/products/1651 ...
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3answers
123 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
374 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
73 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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1answer
62 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
35 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
42 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
54 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
99 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
27 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
69 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
127 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
58 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
129 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
860 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
18 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
102 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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4answers
94 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
85 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 ...
3
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1answer
71 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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47 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
69 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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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
51 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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123 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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2answers
129 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 ...
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3answers
567 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
83 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
155 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 ...
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84 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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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 ...
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1answer
116 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 ...
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1answer
62 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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162 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
129 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
62 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?"
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1answer
207 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 ...
0
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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 ...
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2answers
136 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
72 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 ...
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1answer
127 views

Going from Breadboard to PERMANENT circuit but have Arduino shields attached?

I have made an Arduino project that uses a shield. I am now trying to turn it into a permanent circuit. I have flashed the microcontroller with the program, and I have all the parts I need to solder ...
5
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1answer
168 views

I need to create a planar inductor with a specific value of 28 nH on a 4-layer PCB. How do I determine the proper trace geometry?

I am using a Linear Technologies LT-1534 part an need to create a planar PCB surface inductor with the specific value of 28nH; i.e., the inductor will be a copper trace on the PC boards Top Surface to ...
2
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1answer
73 views

Gas Tubes: neutralization of space-charge causes drop in tube resistance? Deionizing voltage re-combination?

The following paragraph is from Chapter 3 of the book Principles of Electronics. When cathode is heated, it emits a large number of electrons. These electrons form a cloud of electrons near ...
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2answers
632 views

How to tell if an electronic component is counterfeit?

I've been looking into sites (like Alibaba, etc...) for components, but they are usually at the price of the rain. How can someone know if a company or factory is not a scam and that those components ...
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1answer
200 views

What is this component and what is its use?

I found this in CRT TV on the CRT tube driver PCB. What are they and what is their schematic symbol?
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1answer
91 views

Measure length tape dispenser

I've got an m1000 tape dispenser which is already an automated tape dispenser for industrial usage. The problem is that I can't get enough grip between my shaft en and tape to get the precise length ...