hi every one and merry christmas to all
i'm making this circuit for a project
pic attached but i'm not sure about the capacitors
on the schematic they look like they show polarized caps on the finished pcb it shows tant caps can any one varify pz
cheers
all
marko

sorce http://chemelec.com/Projects/Sequencer/LED-Chaser.htm

 

Tantalum capacitors are polarized.

 

oooops never notices that
what a f***ing idiot i am
thanks for that. will have a look at the ones i have
i feel such a fool maybe thats why some of my circuits never worked

 

so where it says 35+ thet means that is the + side or are the dotted lines the - ?

 

Tantalum's are a bit confusing, the dotted line/+35 is the positive connection.
In some case it is a continuous line.
Max.

 

Tantalum's are a bit confusing,

Begin Rant

<
ALL capacitor markings are confusing -- Sometimes thy don't bother to mark them at all.
>

end Rant

 

Begin Rant

<
ALL capacitor markings are confusing -- Sometimes thy don't bother to mark them at all.
>

end Rant

If they are polarized then they ARE marked.

 

In some cases they are marked even non-polarized as in small value decoupling capacitors to ensure the outer plate/foil is connected to common, similar reason in the case of very high voltage types.
Max.

 

Tantalum's are a bit confusing, the dotted line/+35 is the positive connection.
In some case it is a continuous line.
Max.

And sometimes the only polarity marking is a tiny + symbol that is so small and fine as to be almost invisible without a magnifier.

 

If they are polarized then they ARE marked.

Of course, you are right. If I am going to rant then I should at least rant accurately and coherently -- I was thinking more about value markings when I wrote that. Most surface mount ceramic caps are not marked with a value at all.

p.s. Does anyone remember the old caps that used 6 dots?


-- Richard