Questions tagged [symbol]

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

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31
votes
2answers
5k 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.
33
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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?
8
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3answers
912 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
87 views

Electrical schematic symbol help(looks like an or gate)

I'm wondering if that little dot represents anything?
3
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1answer
162 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 ...
3
votes
1answer
103 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
81 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 ...
0
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2answers
126 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
95 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 ...
0
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0answers
27 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 ...
7
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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 ...
2
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1answer
197 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
47 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 ...
0
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1answer
75 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 ...
0
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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 ...
3
votes
1answer
93 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 ...
8
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1answer
223 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. ...
8
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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?
0
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1answer
48 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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0answers
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
75 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?
2
votes
2answers
167 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
67 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 ...
8
votes
1answer
512 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 ...
3
votes
1answer
45 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 ...
0
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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 ...
0
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1answer
182 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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0answers
61 views

Error: L6218E: Undefined symbol LCD_X_Config in Keil

I encountered a problem working with the EMWIN package in keil, this error message: ...
0
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3answers
162 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 ...
3
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2answers
165 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, ...
0
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1answer
142 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 ...
0
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2answers
51 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
109 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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votes
3answers
1k 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 ...
0
votes
1answer
94 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
162 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
346 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 ...
7
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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 ...
0
votes
1answer
78 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 ...
0
votes
1answer
1k views

What does the x mean on MCB?

Any clue? Or is it just there for better visual?
6
votes
1answer
1k views

What is the meaning of the “lasso loop” on circuit diagram?

I've never seen this "loop" structure in a circuit diagram before. Pin 6 has a line that loops around the lines from pins 5 and 9. Pin 7 has a line that loops around all other lines, except the ?...
11
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1answer
2k views

Symbols: Double-arrow circle enclosed “10” on electronic appliances

What does the symbol that says 10 inside the double arrowed circle mean? I have seen a similar symbol on another appliance that had the number 25
0
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0answers
79 views

Help with RGBS schematic

I am making up a cable for the below diagram, but am slightly confused about the shielding. Does this mean that the red (earth) should shield the yellow, white (earth) shield the orange, etc? Does ...
2
votes
1answer
318 views

What does this symbol in a schematic diagram mean? (wire through circle)

I am looking at the data sheet for the iC-NZN N-type laser diode driver. What does the marked symbol stand for? It appears in a number of places, always marking IO pins. My guess would have been ...
2
votes
1answer
247 views

Having Trouble Identifying Crystal Oscillator Symbol

I'm working on a circuit implementing the TI CC2640R2F (Datasheet) which requires an external 24MHz crystal oscillator to function. In the schematic (pg. 42), it shows what looks like a normal ...
1
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1answer
88 views

What does this “Not Installed” symbol mean on the data sheet?

I am designing a circuit that uses the TI TPS561201 buck converter. Reading the data sheet, I am slightly confused with the notation of "Not Installed" next to some of the components. Questions: ...
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2answers
142 views

SENT protocol output unit is LSB. What does this mean?

I have read couple of datasheet of devices which uses SENT protocol. They define the output between 193 and 3896. The unit is LSB. I think that this does not mean least significant bit? Example: ...
0
votes
1answer
546 views

Symbol for ideal voltage source vs symbol for real voltage source

Wikipedia's article on Voltage source shows the figure below. It says in the figure that the following symbols is an ideal voltage source. However, elsewhere in the same article they have a circuit ...
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1answer
453 views

What is this triangle symbol representing?

I am getting started with electronics and decided to learn about the inner workings of the L293D. However, I found a symbol I don't recognize, which is the triangle with 3 connections. There are four ...