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Questions tagged [symbol]

An electronic symbol is a pictogram used to represent various electrical and electronic devices

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2answers
114 views

What does this schematic symbol mean? Looks close to variable resistor

Looking at a schematic for a power regulator I found this symbol I am unfamiliar with. It looks like a variable resistor but only two connections are used. What does it mean?
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1answer
91 views

What does a symbol with an arrow pointing to the upper right mean?

Full Circuit Below I looked through multiple sites that includes a lot of different symbols and I have no idea what this is.
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2answers
73 views

What does this diamond, arrow and tail symbol means in schematic diagram

What does these symbols in the electric schematic means? I believe the arrow head indicates the direction of flow of current from left device to right device. What is the tail of that arrow symbol ...
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1answer
147 views

What symbol is this?

Does anyone know what this step between the two lines mean?
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1answer
83 views

What's this regulatory symbol?

I am trying to identify this symbol as a part of personal research. I could not find any leads with Google Image search.
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1answer
96 views

Op-Amp unusual symbol

I find this circuit in an old book. Regardless what is the task of this circuit, i wonder why the op amp symbol is unusual(curved)? This is the datasheet of LM301A: http://www.utm.edu/staff/leeb/...
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1answer
53 views

MOSFET Symbol Confusion [duplicate]

Hi i am a student & was hoping someone could please clarify on the below. In a section of learning materials for a module I am taking the symbol for the MOSFET is shown and referenced (FIG 11) ...
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57 views

Is there a standardized symbol/refdes for PCB mounting points?

I've seen a variety of different parts substituted in for mounting locations, including 1-pin header, test pad, and fiducial symbols. I've also seen a variety of reference designators for mounting ...
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3answers
3k views

What is the name/purpose of this component?

I was wondering what is the role/purpose of the electric component in the red square. This is the schematic of a 230V single phase induction motor. What is also not clear to me are the connections on ...
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2answers
6k views

What is this symbol: semicircles facing each other?

What does this symbol represent? It was found on the circuit diagram for a TDS973A a board for which this was the only information I was able to find online.
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2answers
10k views

Weird resistor with dots around it on the schematic

I was looking through the LTC4041 datasheet and saw this: The 10mOhm resistor with the two nodes really close to it - is that a "special" resistor or something? Why have they drawn it like that?
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3answers
948 views

Different inverter (logic gate) symbols

The symbol for an inverter (logic gate) is usually the one shown below left. But I have sometimes seen the symbol shown below right. (See, for example, the last image in this answer.) What does ...
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2answers
88 views

Electrical schematic symbol help(looks like an or gate)

I'm wondering if that little dot represents anything?
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1answer
177 views

What is this schematic symbol? Transistor ? Variable Inductor

I was looking through an old schematic and found two symbols that I didn't recognize: Is this a PNP transistor? looking up the model number doesn't give much information. Is this some kind of ...
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1answer
109 views

What is this connector symbol?

I'm working on a PCB design homework in PADS and I've come across a symbol that I have never seen (circled in red below). It is of a filled in rectangle with a triangle below it. I'm thinking it ...
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0answers
84 views

Common symbol for PLL

Is there a common symbol for PLLs, either for schematics or functional diagrams? I need a symbol which would be easily recognized as a PLL, without having to draw the phase comparator, loop filter, ...
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2answers
132 views

How should I interpret numbers 3 and 4 on the footprint schematic?

I am creating a foot print for this PoE magjack and was wondering how to correctly interpret the symbols for 3 and 4 on page 5. From the schematic, these pins get wired but I am confused as to why ...
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134 views

What is this symbol on the ground connection?

I've come across the following symbol, boxed in red, in a single line diagram for a switchboard. From looking at it, I'm interpreting it as some sort of ground connector, but I want to confirm. I ...
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1answer
117 views

What is this dumbbell looking symbol on this schematic? (looks like jumper pad, but with a short)

Regarding to SJ1 and SJ2 in this schematic: On the board it looks like two ordinary copper pads but with a thin connection between them. Is it meant to be a way to open the circuit by scraping off ...
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0answers
34 views

Proteus 8.6 pin names disappear after creating schematic symbol

I selected "Draw name" after placing the pin, but after I created the symbol (which I placed in a user created library) and placed the newly created symbol in the schematic, all of the pin names ...
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2answers
2k views

What does this circuit symbol mean? [duplicate]

I'm a student who is trying to build a wah pedal for a guitar. I came across this diagram for how to wire the circuit (from this site) : Within the diagram, I am not sure what the following symbol ...
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1answer
199 views

∀ (for all) in voltmeter specification

I am working on a voltmeter and the tolerance for it is 0.25% ∀ 1 digit. I am not sure what exactly what this means. I am guessing if my value was 19.95 'for all' could mean I have a range of ...
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0answers
65 views

Spark gap schematic symbol help

I disassembled a Sharp 42" LCD TV power supply board and discovered 3 glass Spark Gap components (Gas Discharge Tube/Surge Absorbers). I haven't worked with them before and I'm curious about the ...
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1answer
82 views

Power Source Symbol — Which to use (Arrow, Bar, Circle, etc.)?

I'm wondering if there is anyone out there with a definitive answer to why and/or what standard would call out the usage of the different voltage sources. There are Bars, Arrows, Dots, Waves, etc. I ...
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1answer
84 views

Can someone identify this transistor and/or resistor component?

I stumbled upon a weird transistor or resistor component which I can't place. Here is a simplified version of the circuit: I am pretty sure that the transistor on the bottom is an N-MOS transistor ...
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1answer
101 views

What is this Venn-Diagram-looking symbol?

So I am looking at the datasheet for the LTC4416, and there is this Venn-diagram symbol after the op-amp, but I don't think it is supposed to be an inverter. It is also used for these currents, but ...
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1answer
228 views

Are these (dis)assembly screw symbols standardised?

Sometimes there are these two half-arrow symbols on PCBs and on enclosures. See the images, for examples. Those symbols are often placed near the screws, that are to be unscrewed upon disassembly. ...
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2answers
1k views

What does this symbol on the box of power supply mean?

I always see this symbole behind electronic devices. A close-up image of the symbol: What does it mean?
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1answer
49 views

What is the two-pin polarity indicator for a PCB? [duplicate]

I inserted a two-pin header (P1) into this circuit using EasyEDA. Does the square outline mean that is the positive pin, or is there another meaning?
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21 views

Data rate with modulation and conventional encoding

I had a rather simple question. Say I had a SISO communications system with an information data rate of 50 Mbps that uses QPSK modulation and a rate 1/2 conventional coding. What would be my symbol ...
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1answer
79 views

Is there a standardised noise source symbol for circuit diagrams?

Does anyone know of any standard symbol for a noise source, for example of one wants to represent the Johnson-Nyquist noise, what is best to use?
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2answers
189 views

What is the correct schematic symbol to use for virtual ground?

I'm following the design of a circuit requiring a power supply to provide something the author calls virtual ground, \$V_{gnd}\$. The circuit look like this: However, I'm using KiCad for the design ...
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2answers
71 views

Cannot Identify Schematic Symbol

I am looking at a VGA to HDMI conversion circuit, and right near the HDMI connector is an array of these symbols: By the values posted by these symbols, it looks like some sort of capacitor, but I ...
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1answer
531 views

What does this resistor symbol mean?

While repairing a Marantz amplifier using the service manual, I came across resistors with odd symbols (see page 18). They are trapped between two parallel lines (for example, 3297). Is this linked ...
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1answer
49 views

What's the circuit diagram symbol for a variable reluctance sensor transducer?

I know I've seen the symbol before, it's something like a circle with an open triangle facing in the direction of current flow with a line through the middle. I'm specifically thinking of the ...
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0answers
50 views

Addition to DC/AC converter symbol

This image is of a DC/AC converter (inverter), but with the addition of a "C S" block to the left. What is the meaning of this additional block? The wire at 9 o'clock is from an AC supply. This is ...
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1answer
284 views

NTC PTC thermistor symbol

What is the reasoning behind the arrows on the circuit symbols of NTC (up and down arrow) and PTC (two up arrows)?
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73 views

Error: L6218E: Undefined symbol LCD_X_Config in Keil

I encountered a problem working with the EMWIN package in keil, this error message: ...
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3answers
202 views

Multiple different grounds in one diagram

Assume I have multiple electronic circuits and I need to display them working together. Each of them has a common ground symbol. However, the different grounds of the different circuits are not ...
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2answers
174 views

Is this symbol another version of a ferrite bead symbol?

I saw this symbol in the schematic of the ADPD2140z eval board. From what Ive seen online, ferrite bead symbols are usually slanted rectangles with right angled corners. This is slightly different, ...
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1answer
151 views

unknown circuit symbol rectangle with arrow

I've never seen this symbol before but my wiring diagram is full of it. I also have searched for lists of symbols but it isn't among them. Does anybody know what is is? It is from my wiring diagram of ...
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2answers
52 views

Altium pin parameters in symbols

thanks for the many great questions and answers over the years. This is my first question. I use Altium Designer for capturing designs. I had an idea to make my processor components a little more ...
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0answers
112 views

Female symbol on PCB silkscreen?

You can see the symbol on the upper right hand side of the board, what appears to be a pictogram of a woman wearing a dress, similar to a bathroom sign (?) Wondering what this is.
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3answers
2k views

What are the use cases for a closed solder jumper on a PCB?

I've come across the the symbols for closed solder jumpers in design libraries, and now I came across one in a design. I get why you might include an open jumper that could be solder closed, but what ...
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1answer
110 views

what is the German/Austrian nomenclature(Voltage and current direction) in electronic circuit?

AS I came from a country where we use the french system in defining the voltage current arrows in electronic circuit, I am confused about the German/Austrian system where I see the voltage arrow is ...
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2answers
182 views

KiCAD symbol editor - how to use insert key to duplicate pins with every other number

I'm trying to make this header row in KiCAD. If I place pin 1, and press the insert key, it gets duplicated nicely. The problem is, that pin becomes pin 2, then the next pin 3. I want pin 1,3,5,7,9 ...
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2answers
367 views

Fusible resistor

I'm currently working on an assessment for the electronics part of my PEO and have to complete a resistor report, detailing different types of resistor and their circuit symbols. I have managed to ...
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6answers
3k views

How can I tell if a MOSFET is enhancement-mode or depletion-mode?

Today, from ignorance I have fallen head-first into the world of MOSFET transistors. In my scramble to find some information on the MOSFET I will be using as a switch (HEXFET actually), I learned that ...
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1answer
80 views

What does this transformer symbol mean

In a balun I have, (model 50-7725 from CPC, datasheet -> http://www.farnell.com/datasheets/2365902.pdf?_ga=2.142463986.1590159842.1535980880-667311346.1535980880) It shows the Balun as: What is the ...
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1answer
1k views

What does the x mean on MCB?

Any clue? Or is it just there for better visual?