Electronics for Dummies?

GWHunter

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I'm putting Tinhorns 2 stage timer together.
Can anyone tell me how to detemine polarity?
I dont want to let the smoke out very fast.
 

GWHunter

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Thanks for answering Tinhorn!
Please excuse my ingnorance.
But I am wondering which lead of the capacitors goes where(100uf & 10uf)

Thanks Again!
 

Tinhorn

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GW,

Electrolytic caps do have polarity and you are right being concerned which goes where (in some circuits, if a cap is reversed, besides ruining the cap, they blow up like a fire cracker)

Seems like most caps you buy now-a-days have a "Hollow" arrow with a (-) sign in it that points to the Neg Terminal (naturally, the other lead would be (+)

In the Timer Circuit, the (+) lead connects to pins 6 & 7 of the TLC555's and the (-) lead connects to Batt (-)

**************************************

Diodes have polarity too and the BANDED end is represented on the drawing (schematic) by the BAR that the arrow points too

Transistor Leads are easy to get confused, if your lucky, the ID is stamped on the transistor itself

***************************************

Hope this helps

Tinhorn
 

GWHunter

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Thanks a Million Tinhorn!
I guessed right about the way i put them in.
I just wanted to be sure.----

No Smoke                                    
                                           Thanks Again!
 

Archilochus

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Hi GWHunter,
Careful with the capacitors....
While most larger types you'll find will be just like Tinhorn described, there is another type - the tantalum electrolytic - that is marked exactly opposite!  Usually an arrow pointing to a " + " mark.  This marked lead would go to the more positive side (pin 6&7 of the 555 timer)

Have fun!,
Archilochus
 

GWHunter

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Thanks Archilochus!

This definitely will be something to add to the memory bank.

My electronics experience is just being born with this
project.

My Owl and ms20 are finished and things went good.

Now if the PhotoPoint site would load so I could get the schematic and pics for Tinhorns 2 stage timer I could finish it up.

I truly appreciate all of the help you guys provide for the novice.
 

Jaggermax

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Another way to tell the polarity on radial type caps (both leads coming off the same end) it that the positive lead is always longer.  A lot of smaller capacitors, especially the tantalums have values which are virtually unreadable.  Go by the lead length and you will be OK.   If you hook a tant cap up wrong, you better duck quick and keep a clean pair of underwear nearby because its pretty impressive when it blows.  



(Edited by Jaggermax at 8:05 pm on Dec. 15, 2001)
 

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