Wiring Leds

[cukaracha]

whats the best way to wire about 18~20 LEDs thats powered by a 9v batery?

Edited June 20, 2007 by cukaracha

[tim_ado]

not sure

all i know is that if you want them to turn on when u plug them in the you need a stereo jack instead of mono

Edited June 20, 2007 by tim_ado

[cukaracha]

addition.. switch acticated LEDs...

[cukaracha]

no replies....??

[USAF1989]

Follow the positive/negative rule, use resistors (unless they're built into the led), and use a perf board if they'll be lined up or in a pattern. Of course, you can solder point to point. does that help?

[Dylanwad]

This might help you.

http://led.linear1.org/led.wiz

[cukaracha]

what is the value of the resistor that i'll need to connect an led directly to a 9v battery?

[ihocky2]

Follow the link inm Dylanwad's post. It gives you everything.

[cukaracha]

is it safe to leave the 9v battery connected 24/7 even i'm not using it for a prolonged period of time?

[al heeley]

It is safe. the battery will eventually slowly discharge and the LED light will fade. It will not blow up. After some time the battery termainals will start to corrode and there will be a build up of corroded and oxidised metal at the cathode and anode. This will not kill you if ingested but ingestion should be avoided. If you had a small cat that licked it, it may have a poorly tummy for a day or two.

[billm90]

I have wired up 10 leds without any resitors on a 9v, no issues. perhaps the battery life would last longer if I did.