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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Best Hardware for Accurate Point Tracking System

Here is what I am trying to accomplish: In the middle of a room, I have a mechanism with a laser diode mounted on it that can be moved in all axis by a motorized pan/tilt head type device. This ...
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1answer
64 views

What is a rotating “button” called?

You see them in various stereo systems and such, they are used to simulate a potentiometer. There is no limit to how much you can turn them in either direction and as you turn them they send pulses ...
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3answers
41 views

Matching appropiate current value for components

I was looking around the site and I encountered an intresting answer.The one who posted it said that:"If you supply too much current to a device,it will draw as much as it needs" and also that if you ...
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27 views

Other active component principles of operation

Besides valves and transistors... On another question, someone talked about magnetic amplifiers, but they are slow. Are there any other kind of "would-be" transistors out there ? A transistor that ...
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1answer
64 views

Help identify a resistor-like component

I came across this component, it looks like a resistor but has no color bands: Thanks
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78 views

List of all cllasses of electronic components that ever existed [on hold]

I am searching for a source, listing all electronic components that ever existed, even if obscure, like (for example): Selenium rectifier, Miniature vacuum tubes, etc etc Can someone point me to ...
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1answer
24 views

Replacing SD card reader on a Raspberry Pi B+

I recently purchased a Raspberry Pi B+. However, the micro SD Card reader had a defective spring loading mechanism, so the card would not lock in place (a new Pi is now on the way!) However, I would ...
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2answers
77 views

Historical electronic components used in computers

Early computers used vacuum tubes and relays as active components to process information. Later on, transistors replaced those as the main components used in computers development (transistorized ...
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47 views

Unknown LCD display circuit design

I opened up the case of an old toy to take a look at what is inside. The device had what seemed to me a bizarre LCD display with a controller(or microcontroller?) I have never seen before(middle ...
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2answers
388 views

Inductive and capacitive terms

What it means when we say that some component or device is inductive or capacitive? How these terms are related to capacitors and inductors?
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1answer
46 views

Simple Circuit to stream video [closed]

I want to stream online video to an LCD screen from a phone or tablet. In the circuit will also be an accelerometer, battery, and perhaps a cache (if this would improve streaming). What kinds of parts ...
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4answers
76 views

What is the part name / description for these test points?

What is the name/description for the test point pins on this board? I've tried Digikey for all combination of binding post, test pins et, but no luck. These are through hole parts, height ~6mm, pin ...
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1answer
65 views

what is the purpose of this device>

I have this device out of an old laptop, and I have no idea what it is. there is a tiny tag that says something about RFID, and it has 4 wires going in. There is a coil of some sort, but most of the ...
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63 views

What is the name of the tiny PCB radio connectors? (e.g. Apple WiFi/Bluetooth antenna ports)

What is the name of the nearly-flush flat antenna connector often found in laptops/tablets for its external antennas? They are very small and the antenna lead usually has a 90º male plug that snaps ...
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94 views

Where can I search components according characteristics, not model?

I'm 2 years disconnected of electronics, and i don't know how i get and know the components i used, and i want to get and know few more components, but i can't get to know them... and well i was ...
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1answer
105 views

Automatic Solar light far too dim, help with increasing brightness

simulate this circuit – Schematic created using CircuitLab I've built a simple circuit that uses a transistor to switch from charging 2AA batteries during the day to discharging the ...
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1answer
115 views

Circuit component

What is this circular component with two parallel lines in it? I've never seen this before
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39 views

Composition of sticky gel in Film Capacitors

Bit of a long shot here, maybe someone knows what the sticky clear gel might be inside common dual film can capacitors (motor run). I'm specifically looking for an MSDS. This particular one was ...
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1answer
37 views

Altium: White 2D outlines [duplicate]

I started my component orientation when I suddenly see those white outlines around my components. And as I zoom in, they increase in number. Even when I tried to move my components elsewhere, they ...
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1answer
28 views

Altium: Rules and Query syntax

I want to set some rules for certain components. These rules are in the minimum solder mas sliver but I'm stuck on the query. So far I've written IsDesignator = U7 but nothing seems to change and I'm ...
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19 views

Altium: Foot print manager

Somehow not all schematic components (3 out of the 10 schematics have their components in the footprint manager) are found in the footprint manager. I made sure all tabs above (i.e. designator, part, ...
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1answer
60 views

Altium: How can I edit a component from a library

I downloaded a library from the internet and I want to create a new PCB component using the ones in the downloaded library with little editing/changes (such as the footprint). Is that possible? How?
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42 views

Atlium: Errors in PCB

I keep getting the same errors repetitively and I couldn't figure out the reason. As I was placing the components on the correct position (i.e. resistor), suddenly the component changed pattern from ...
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0answers
36 views

Automatically control EQ and Volume on audio signal

I am trying to control an audio signal with a microcontroller. I would use digital pots but seeing as I need 250k ohms, 300k ohms, or 500k ohms, at LEAST 256 taps, and volatile memory, there don't ...
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4answers
217 views

Troubleshooting PCB of an ATX power supply?

Im new to PCBs, know the basics of electronics and testing of individual components. I have a PCB (of an ATX supply) that is not working when I power it, so I thought of testing each components like ...
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50 views

Could somebody check this circuit/components and size the resistors?

simulate this circuit – Schematic created using CircuitLab Could somebody please check this circuit/components and size the resistors for me? I'm trying to produce a variation of this: ...
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99 views

What is this SMD component

Just out of curiosity I am trying to find out. What type of component is the green flat one in the picture?
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54 views

help with correct components for Fluid dynamic experiment and the circuitry on board testing rocket [closed]

I have a project that I am attempting to build and I know generically what I need to order but the detail is the problem.I have tried trawling though catalogs to find the appropriate component sensors ...
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1answer
38 views

How to generate a file with BOM for multiple schematics - EAGLE

I've 3 boards each with it's own schematic but with a lot of common components. I want to generate an unique BOM for all this boards to know quantity of each piece I need and make a single order BOM. ...
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316 views

How to choose components for a circuit

I designed a simple circuit: that I would like to put components on - the point of the circuit is to light the LED when the voltage source is above 4 volts (it won't be more than 5), so I am ...
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23 views

How do I automate the size setting (or any property) of both NAME and VALUE in a PCB BRD file?

I would like to set the size parameter of both value and name of components on a PCB layout to have a readable silk screen. Now it seems that I have to smash everything and go by them one by one. Is ...
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62 views

does changing the cable length of NTC temperature sensor affect accuracy?

I'm using an off-the-shelf STC-1000 temperature controller, popular with homebrewers, that uses an NTC sensor to read temperature and switch on a relay to cool or heat when the sensed temperature ...
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1answer
23 views

What are possible alternatives for a depletion PMOS

I need a fast reacting way of discharging a capacitor and I figure a simple depletion PMOS is what I need. The time at which the gate has to have a voltage to keep the depletion PMOS closed is not ...
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2answers
90 views

Creating an Integrated Circuit Component in Altium

I am new to PCB designing and I am new to Altium. I want to make a schematic, PCB design and simulate a RF circuit involving a GPS receiver front end IC MAX2769. Altium library does not have this IC. ...
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3answers
82 views

Component selection - difference between 4027 and 4027N flip flops

I am building a simple circuit that will use a J-K flip flop to enable me to use a momentary switch as a toggle. The circuit diagram states that a 4027N should be used. My local supplier has a ...
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8 views

PSpice Parts Setting Questions

Can somebody tell me how to set the "VAC" and "iPRINT" parts? Does the "VAC" part take to be sine or cosine ware? And does the "iPRINT" part follow what every "VAC" take for in terms of sine or ...
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51 views

Component identification service

For pills there exists a service which can ID them based on markings, shape, color, etc. I buy the grab bags of ICs from Jameco and sometimes get a part or two that I can't identify within a few pages ...
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1answer
77 views

Component identification 8Y

I hope someone can help I am trying to find out what this component is so I can hopeful replace it The device is a Fluke Network Management device the unit works for about 2-3 minutes depending on ...
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87 views

What is that rotating component for menu?

On some home made electronic circuits, to navigate the menu on LCD screen, a rotating component is used. My first guess was that it was a potentiometer and ADC was used for detection, but it rotates ...
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115 views

Can anyone identify this part?

I am thinking maybe a thermistor? I can't remember where I got it from.
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1answer
198 views

What parts could be labeled XT and be near a Clock of a microcontroller

An ice cube maker stopped working with the symptom that the temperature cycles are getting shorter and shorter. I suspect that the microcontrollers clock is not working properly. I desoldered a part ...
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33 views

“LB” component reference designator

I'm doing a bit of reverse engineering on my Das Keyboard Model S Ultimate. I'm beginning to develop a pretty good understanding of the circuitry, but I am confused about one type of component on the ...
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59 views

Need help identifying a component

I'm doing a repair job on a hard drive logic board which has a blown component. I'm used to dealing with SATA drives where the TVS diodes have suffered damage and therefore taking them out of line / ...
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2answers
48 views

Components with multiple possible values - how to designate on schematic?

Quite often it happens to me that values of resistors or capacitors don't play such a significant role. This is mainly the case with decoupling capacitors and e.g. LED series resistors. Often in ...
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35 views

Type M AC Adapter Pins -Identification Help

Below is the picture from a Belkin Wemo wireless switch teardown for the side that plugs into the wall outlet. The complete teardown is here They have mounted the AC pluggable pins directly on the ...
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1answer
77 views

Alternatives for a UDN2981A

I'm making the circuit depicted here. I already have the shift registers I require, but I can't find any UDN2981A ICs in the stores I have available to me. Unfortunately, I don't have time to wait ...
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3answers
390 views

Thought Process on Designing Circuits

I'm currently in my second year of computer engineering. I've taken circuit analysis courses and have a good general understanding of components, and a little bit of digital design, however, I'm very ...
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1answer
115 views

16x2 LCD Missing Components on the Back [duplicate]

I'm quite new to electronics and am doing it as a hobby. I recently bought a 16x2 LCD display online to use it with an Arduino. When I received it, it noticed that there were a few components missing ...
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67 views

What do you call a rotary switch that does not have a max turn degree?

Exactly like on the Logitech G35 or Logitech F540; not a rotary switch because those have notches and a physical limit. Instead of turning clockwise, or counter-clockwise, you rotate it 'up' or ...
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62 views

accelerometers vs gyroscopes

In terms of semiconductor integrated circuits, is there any difference between an accelerometer or a gyroscope? are they the same part? Can I get a IC recommendation for something with 3 axis?