Looking for schematic symbol reference

[apelly]

Howdy,

I've been looking through a couple of schematics as preliminary research before some hacking, but some of the symbols are unfamiliar to me.

Can someone recommend a resource with picture -> description -> function translation please?

Aaron.

[dr_p]

Google images search "electronic symbols"


there is an android app called Electrodroid that among others, has a schematic symbols library


but you can also post some symbols that you don't know and people will advise on those.


Cheers!

[apelly]

Thanks.

If it was as easy as a google image search I wouldn't have wasted anybody's time. (Unless I missed a gem in there somewhere, then sorry)

I have used electrodroid, and it isn't useless, but it's not what I'm talking about either.

Somebody (a bunch of you?) knows a website with a pretty comprehensive list of symbols. Surely?

[dcel]

Post a pic of the schematic so we can see what you are looking for help on.

Chris

[ampdoctor]

Post a pic of the schematic so we can see what you are looking for help on.

Chris

That would be the best advice.   Most schematic symbols are pretty standardized. Opamps, discrete semi's, resistors, capacitors, various gates, etc. In total I would bet there's less than 100 symbols that anybody would ever reasonably have to deal with unless it's a real oddball.

[c4757p]

In total I would bet there's less than 100 symbols that anybody would ever reasonably have to deal with unless it's a real oddball.

Yeah, I think you are correct.

Code: [Select]

Antenna
Battery
Capacitor, Bipolar
Capacitor, Polarized
Capacitor, Variable
Cell
Crystal
Dekatron
DIAC
Diode, Constant Current
Diode, PN
Diode, Schottky
Diode, Tunnel
Diode, TVS
Diode, Varactor
Diode, Zener
Fuse
Gas Discharge Tube
Gate, AND
Gate, Buffer
Gate, OR
Gate, XOR
Gate, "NOT" Symbol
Inductor
Lamp, Incandescent
Lamp, Gas Discharge (Neon)
LED
Microphone
Motor
Photodiode
Phototransistor
Potentiometer
PUT
Relay
Resistor
Resistor, Variable
SCR
Speaker
Switch
Thermistor
Thyratron
Thyristor, GTO
Transistor, BJT NPN
Transistor, BJT PNP
Transistor, BJT NPN Schottky
Transistor, BJT PNP Schottky
Transistor, N-IGBT
Transistor, P-IGBT
Transistor, N-JFET
Transistor, P-JFET
Transistor, N-MOSFET Depletion
Transistor, N-MOSFET Enhancement
Transistor, P-MOSFET Depletion
Transistor, P-MOSFET Enhancement
Transformer
TRIAC
UJT
Vacuum Tube, CRT
Vacuum Tube, Diode
Vacuum Tube, Klystron
Vacuum Tube, Magic Eye
Vacuum Tube, Pentode
Vacuum Tube, Photomultiplier
Vacuum Tube, Tetrode
Vacuum Tube, Triode
Varistor

That's 66 and I definitely included some oddballs. Any more?

[JOERGG]

This could be a starting point for you

http://en.wikipedia.org/wiki/Electronic_symbol

Take also a look at the external links on the bottom of the side.

Be aware of, that there are different standards, for the symbols, around the world.

[apelly]

This could be a starting point for you

http://en.wikipedia.org/wiki/Electronic_symbol

Better, but incomplete. What is useful though, are the links to the definitions. With hind sight this should have been the first place I looked.

Post a pic of the schematic so we can see what you are looking for help on.

I will, but if I just get told I will not learn.

[Hideki]

Your problem here isn't really the symbols but the people who drew that schematic (in Eagle). It is possible to make decent looking schematics with that program, but many of the existing symbols are rather bad and/or really weird or based on some odd (or at least less commonly seen) german way of drawing things. Too bad most people don't bother to make their own or mess up badly when they try.

The filled in rectangles are supposed to be transformer windings.

You will find the same basic schematic on page 13 of the user manual. It looks a whole lot better there, but the symbol for the IGBTs still look wrong.

While not the most confusing schematic I have ever seen, it does rank high up on the ugly schematic list.

[c4757p]

Hmm. It would have taken me a minute to figure out the IGBTs too. Once you realize what they are, it's obvious that they are just weirdly drawn IGBTs, but at a first glance they look more like sideways tea kettles....

That's a truly bad schematic. Why do they all seem to be drawn in Eagle? No reference designators, some parts are missing values even (the comparators/drivers/whatever they are, the IGBTs, the second power symbol from the left never mind - it's the only one, the diodes, the transformers and the fuse). I'm not even 100% sure what the signal/power path is here. How ghastly.

[apelly]

While not the most confusing schematic I have ever seen, it does rank high up on the ugly schematic list.

This is reassuring! 

You are right. Page 13 of the manual is much clearer. (RTFM) For anyone interested it is here (Warning:PDF)

I was trying to find a more general resource for use in the future though. I was looking at the datasheets for the ICs and they're not straight forward either.