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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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24
votes
5answers
23k views

What is a “100R” resistor?

Sometimes I see references to "R" resistors. For example: Obviously the 100 refers to 100 Ohms. What does 100R mean?
10
votes
2answers
2k views

What does this triangle/diamond schematic symbol represent?

Could someone please tell me what the symbol ringed in red represents? I know it has ON Switch pointing to it, but the symbol has other lables in different parts of the document.
7
votes
3answers
27k views

Dots in a transformer symbol

I came across this schematic: What do the dots in the transformer indicate?
13
votes
2answers
2k views

What does this symbol in the schematic represent?

I know the symbol at the bottom is ground, but I can't get what the other symbol is. It can be a single symbol of two arrows pointing at each other, or two symbols each one a arrow. I also have the ...
20
votes
3answers
19k views

What does a two overlapping circles symbol mean in an electrical schematic/diagram?

In the datasheet for a A3503 Hall Effect Sensor, I saw a circuit diagram labeled 'Functional Block Diagram', and it shows a symbol I have not seen before. It's shown here between 3 - Output and 2 - ...
11
votes
1answer
6k views

What do multiple emitters/collectors imply in a BJT schematics symbol?

I sometimes come across with BJT symbols from which multiple lines come out of emitter or collector. Are such BJTs different kind of devices? What does it mean in solid-state level?
18
votes
3answers
34k views

Use of ground symbols in circuit diagrams

In this question is the following diagram for a voltage booster intended for small battery powered devices The TPS61200 spec says GND is control/logic ground and PGND is power ground but this isn't ...
10
votes
4answers
9k views

Why MOSFET source is indicated with arrow ?

I know that , a basic MOSFET contains source and drain , and either it's a NMOS or PMOS ; it is indicated by an arrow at source . But let's look at a fabricated NMOS. Here we can easily see that ...
3
votes
1answer
4k views

Different grounds

What is the meaning of different type of grounds in electronic circuits? Can we use any ground in any circuit or not?
4
votes
2answers
11k views

Meaning of FB symbol in schematics?

What does "FB" mean? I can only guess it's some kind of protective device because of F, like with FU for fuse. Is there any comprehensive online guide for such kind of symbols?
2
votes
4answers
228 views

Where do these grounding wires go? [duplicate]

In the following schematic the two Vss pins where are supposed to be the grounding pins don't connect to anything. Does this mean that the circuit is self-grounding (if that's even a thing)? I'm ...
3
votes
1answer
1k views

What does the x mean on MCB?

Any clue? Or is it just there for better visual?
26
votes
4answers
34k views

What do the arrows in transistor symbols point to (and from)?

Transistor symbols are often drawn with arrows pointing in one direction or the other, depending on type, like in the following symbols: But what is the arrow actually pointing at? And from where are ...
22
votes
1answer
4k views

Does anyone know the history of the earth ground symbol

I Googled for hours, asked every EE professor in my college, then checked every electrical engineering book in my university's library (hours), and have found nothing about the history of the ground ...
8
votes
2answers
2k views

Why does CircuitLab have the MOSFET symbols it has?

CircuitLab has [used to have -- they have changed their symbols since this question was asked] these goofy things: simulate this circuit – Schematic created using CircuitLab My eyes are much ...
8
votes
3answers
2k views

Where does this current source symbol come from?

There's an old symbol for a current source that's just two overlapping circles, reminiscent of a Venn diagram. There is more than one question on here with people asking what the symbol is, but I'm ...
6
votes
2answers
5k views

Resistor symbol with a dot

I was looking for some reference and I found this resistor symbol: All the resistors in the schematic (several sheets) have the same symbol, so I concluded that it means nothing, but I'm not sure. ...
3
votes
4answers
2k views

Diamond symbol in schematic

I am having a lot of Diamond symbols in my schematic named as Pxxxx. I am not able to find what it means as there are no legends mentioned in the file. Also, are there any general conventions that ...
3
votes
1answer
585 views

What is this schematic symbol? (Two small circles connecte by a bent line)

What does this symbol mean? It's part number is XM## and is connected in series with the output voltage of a chip.
3
votes
3answers
7k views

What does the T symbol signify in electrical diagrams?

I'm trying to connect to my atmega1284rfr2 using the basic application circuit in their datasheet. The red lines and letters are my own annotations. I'm having trouble understanding what all the ...
1
vote
3answers
878 views

What does this strange symbol refer to?

I am referring to the symbol with +4V next to it. Seems like a voltage source to me. I just haven't seen this anywhere before.
8
votes
3answers
946 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 ...
8
votes
1answer
530 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 ...
5
votes
1answer
3k views

Schematic symbol confusion

I'm looking at building an audio amplifier using the following the TDA7385 amplifier IC. Here is the data sheet: http://www.mouser.com/ds/2/389/CD00002618-109852.pdf I am confused by the application ...
5
votes
2answers
584 views

Diagram symbol I've never seen

So my buddy brought me his Kawasaki Ninja service manual and asked me what this symbol is - sort of looks like part of a diode with a box instead of a line and is half shaded. I've tried looking it up ...
1
vote
2answers
1k views

Body diodes in MOSFET symbol

As I understand, all MOSFETs have body diode. But I see some symbols have body diode shown while some not. Is there a difference in such MOSFETs?
-3
votes
3answers
682 views

What does this symbol refer to?

What is the symbol that is below the C1 capacitor and R1 resistor. Is it the symbol of grounding?