Questions tagged [symbol]

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

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What is the name of this D-shaped electrical component symbol? [closed]

I believe that there is a missing component in the highlighted area. What is that component? I have done some research and found that symbol corresponds to a transistor but I'm not sure what type of ...
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Does anyone recognize this schematic symbol? (Ethernet connector)

The symbol I'm looking for is the one inside the circle of the schematic. I thought it could be some special kind of fuse, but I haven't seen anything like this before, nor been able to find anything ...
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Weird NPN transistor symbol with a box connecting all three pins?

I've come across this symbol in the datasheet (link below) of a transistor for a halogen "electronic transformer" that uses two in a half-bridge operating at about 35KHz. The datasheet ...
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What does this symbol on PCB mean?

I've searched for this symbol for hours but can't find what this means..
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1 answer
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What does this symbol from a voltage regulator schematic mean?

What does this schematic symbol mean? It is taken from the LM78XX datasheet (figure 17, page 22.)
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2 answers
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I do not understand this polarity symbol with 3 circles: positive, round, negative, and no lines

I am trying to figure out what is the right polarity of a power adapter for a small practice amplifier. I know it is 9 VDC and I figured out the size of the plug and I know the wattage needed. I do ...
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2 answers
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Does altium have common symbols?

Does Altium have common symbols such as opamps, diodes, capictors, inductors that one could use to make their own symbol? Seems like an obvious thing to do.
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ISO/IEC Power/Ground Symbol in schematics?

Yet again, we are debating with colleagues to choose the correct power symbols in our schematics. Some argue that using the horizontal 4-lines symbol for GND is a misunderstanding because this is not ...
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Symbol for potentially dirty ground

I have a net which, although should be ground, could potentially be dirty and contain all sorts of minor noise. What is the correct way for me to denote this in my schematic?
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2 votes
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Is there a circuit symbol for an accelerometer?

I use an analog accelerometer in a circuit, but I can't find a corresponding circuit symbol. Is there such a thing, or, where could I search for it besides wikipedia.
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1 answer
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Does these dots mean anything?

I'm new to electronics, so my knowledge on symbols is not quite complete yet. So I have an old transformer schematic and I have to get the voltages as accurate as possible. Some voltages are very ...
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7 votes
1 answer
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Unknown circular schematic symbol

This is the symbol that I do not know what it means. The top trace leads to a polarized capacitor
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What is this Z symbol on the PCB?

Does anyone know what this Z component symbol is? It was in my solar charger inverter and went up in smoke.
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1 answer
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What are these symbols (switch lookalike + and half a disk next to small pulse)?

I'm told as a new employee in a French company to fully understand and familiarize myself with two circuits to later apply many modifications to them. I was given the schematics and I can't understand ...
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1 answer
120 views

Schematic symbol explanation for transformer with arrow through delta winding

While working on a technical drawing for a station supply transformer in a circuit, I encountered this symbol depicting a 1000/230V Dyn transformer. I am not sure what the arrow crossing the delta ...
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Is there a standard PoE+ input symbol for a product label?

I was expecting to easily find this. However, unlike other safety symbols (such as double insulation / Class 2) I cannot seem to find a lead. Was convinced this would fall under some sort of safety as ...
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Upsampling encoded bits (convolutional encoder) and downsampling decoded bits (Viterbi decoder)

I am testing the reaslisation of encoder and decoder. Initial parameters: BPSK. I start with BPSK sequence: ...
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9 votes
3 answers
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What does a dashed rectangle and an encircled dot mean?

This is a battery charging circuit. The part I don't understand is the block on the lower right. What does that dashed rectangle mean, the ellipse around the resistor? and the encircled dots? The ...
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Help identifying symbol

I need help identifying this symbol it's on a solar inverter it's something on the ac input side to me it looks like the burnt component at question is a non polarized capacitor but the symbol doesn't ...
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3 votes
1 answer
276 views

Identification of a circuit element

Here is the image: What does the triangle with a bubble on one of its sides represent?
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1 answer
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Finding footprints and symbols for common components

I am wanting to use a 5x2 IDC connector in my project which are quite common. Most IDC connectors such as this one don't have a footprint or symbol. Which one do I use? Can I use any 5x2 connector ...
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1 answer
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What does a dashed circle around a connection mean?

The datasheet for the TI TPA3100D2 (a class D stereo power amp) contains a couple of these symbols in the block diagram on page 7: I'm referring to the dotted circles around schematic lines. The ...
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Which (Zener-like) component does this diode-like symbol represent? [duplicate]

I recently stumbled upon a TI datasheet (TPIC6B595, a 595-like power shift register) where they use a diode-like symbol I've never seen. Datasheet excerpt, figure 13 at p.12 (yellow emphasis mine): ...
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2 votes
2 answers
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Help identifying unknown digital circuit symbol in pulse shrinking circuit

Does anyone know what the digital circuit symbol which looks like a triangle with an arrow through it means? It's in a circuit for pulse shrinking. I assume its just a delay. Can anyone confirm or ...
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4 votes
2 answers
2k views

What circuit symbol is this?

Can anyone tell me what this symbol is?
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1 answer
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Do Output Voltage rails get an identifying symbol in schematics?

For example, I have a 3.3V regulator using 5V input from a USB port. I use that output 3.3V rail all over my schematic. Sure, I can read the entire schematic and see - yep, that's the output. But is ...
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Altium schematic parameters position

I want to achieve the capacitor symbol like this(sch library file): But when I turn on an autoposiotion function for parameters - which I also need - then parameters lock in position like this (they ...
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3 answers
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What do the stars in a power meter symbol mean?

Sometimes I see stars in a power meter in three-phase circuit are drawn as below. What do the stars in a power meter symbol mean? There is another example here (page 14/20): Now it seems to me that ...
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1 answer
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What is this symbol that looks like Ø on a schematic?

I'd like to ask about this "empty set" like symbol with a diagonal line through a circle, as shown in the picture below. I have found it in an old electrical schematic. What is it exactly?
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2 votes
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Old Electric Symbol Puzzle [closed]

Here is a weird puzzle. What old electrical symbols are these two? They could be standard but also proprietary: i.e. two symbols superimposed to indicate a multiple function before ANSI and IEC ...
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1 answer
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Schematic symbol color fill with Altium NEXUS

I came across a write-up about using Solder Bridge Jumpers in Altium. However, while attempting to make my own, I was unable to recreate the grey filled semi-circles shown in the authors example: ...
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3 votes
1 answer
383 views

What are these schematic symbols in the HCPL3700? (square with arrows and overlapped circle)

I am working with HCPL3700 to sense mains. In the datasheet it has these symbols: What are those symbols? What are their functions?
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5 votes
3 answers
2k views

What schematic symbol is this switch with an arc?

I've referenced many symbol sheets with no avail. What would JP5 'AutoON' be here? I assume it's a switch that is default on, but the symbol is foreign to me.
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2 votes
1 answer
292 views

European symbols in Altium

Is there a way to change the symbols for the passive components in my Altium schematic to the European style? I only seem to find the North American style of resistors in the components and ...
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2 votes
1 answer
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What is this "filled circle cut into two pieces" symbol on a schematic diagram?

I'm confused as to whether or not this symbol has any significance, and if so what it means. If anyone could help me figure out its meaning, I would appreciate it. Close-up of the symbol: More of the ...
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12 votes
1 answer
869 views

Need help identifying diode symbol

I found this symbol which I've never seen before in pg. 12 of the TI TPIC6B595 datasheet describing the output, it resembles a diode with an extra line at the cathode: I recognize the zener diodes ...
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4 votes
2 answers
2k views

What does this schematic symbol mean? (Circle with an arrow in it)

I've been looking at the schematics of the LM386 amplifier, but there is a symbol I don't recognise, it looks like a circle with an arrow in it (but it's not a voltage generator of course), can ...
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4 votes
1 answer
579 views

How do I tell KiCad where the power is coming from on a Eeschema

The problem I am a beginner/novice using KiCad and in creating PCB's, so I do not know much about these things. After following tutorials from YouTube I managed to create or copy symbols to my ...
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0 answers
91 views

What kind of terminals are these?

What are these symbol from single-line diagrams of switchboards? It seems they are not always related to optical fiber, as shown on this snapshot:
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1 vote
1 answer
76 views

Is this a circuit breaker?

What is this symbol from a single-line diagram of a switchboard? It looks like a circuit breaker or a junction box.
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1 vote
2 answers
72 views

How is this ammeter connected in this diagram?

What are the k, i and circle symbols in the red area on this single line diagram? I feel like the ammeter symbol was deported to ...
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1 vote
1 answer
178 views

What is this electric diagram symbol?

What is this electric symbol found on an MCC-related electric single line diagram? It looks like a voltmeter with some sort of resistor but it would make more sense if it was an actuator I think. On ...
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1 vote
1 answer
130 views

What is this electrical symbol?

I'm trying to identify this symbol coming from a 1985 electrical single line diagram (from a marine engineering project). It looks like a closed disconnector switch or a styled fuse maybe? Here is ...
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2 votes
1 answer
87 views

What does the "source-like" symbol mean in the first NMOS of the CMOS NAND gate?

I would assume that it means the source is not left floating if Q4 is off (boot-strapping ?).
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1 vote
1 answer
109 views

Using Kicad & proper part symbols: How do I add these types of parts for through-hole PCB?

Background I am attempting to create a hobbyist PCB (Printed Circuit Board). I'm using some components which I will provide so end-user can assemble them on a PCB (through-hole soldering them on). My ...
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0 votes
2 answers
138 views

Curly Symbol in RTD PTC Thermistor

What is the meaning of the "curly" symbol close to the double up arrows (Positive Temperature Coefficient, PTC) thermistor symbol? . (Ref.1, Ref.2)
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0 votes
1 answer
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What is the relation between symbol duration and subcarrier frequency spacing in OFDM?

What is the exact relation between symbol duration and frequency spacing? You may know in WiFi6, about 11ax band, there are more sub-carriers compared to WiFi5 because of using shorter frequency ...
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0 votes
0 answers
55 views

xI Inverter Schematic Symbol - What is it?

Looking at the block diagram for the UC3637 and I'm unsure what this block is that takes +Vth and turns it into current Is. Does anyone know the name of this sub circuit? Thanks
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0 votes
1 answer
84 views

Is there any convention for current source symbols like this?

In the page 26 of this lecture note, there are two symbols used for the current sources. The first one is circle and the second one is square. Is there any rule or convention for this?
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What is this element with triangle shapes from the ATmega datasheet? [duplicate]

I am trying to understanding the schematics of the I/O of ATmega microcontrollers. But I can't identify the red marked element. I just want to know its name and its functionality in the circuit. The ...
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