cukaracha Posted June 20, 2007 Report Share Posted June 20, 2007 (edited) whats the best way to wire about 18~20 LEDs thats powered by a 9v batery? Edited June 20, 2007 by cukaracha Quote Link to comment Share on other sites More sharing options...
tim_ado Posted June 20, 2007 Report Share Posted June 20, 2007 (edited) 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 Quote Link to comment Share on other sites More sharing options...
cukaracha Posted June 20, 2007 Author Report Share Posted June 20, 2007 addition.. switch acticated LEDs... Quote Link to comment Share on other sites More sharing options...
cukaracha Posted July 3, 2007 Author Report Share Posted July 3, 2007 no replies....?? Quote Link to comment Share on other sites More sharing options...
USAF1989 Posted July 5, 2007 Report Share Posted July 5, 2007 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? Quote Link to comment Share on other sites More sharing options...
Dylanwad Posted July 6, 2007 Report Share Posted July 6, 2007 This might help you. http://led.linear1.org/led.wiz Quote Link to comment Share on other sites More sharing options...
cukaracha Posted September 26, 2007 Author Report Share Posted September 26, 2007 what is the value of the resistor that i'll need to connect an led directly to a 9v battery? Quote Link to comment Share on other sites More sharing options...
ihocky2 Posted September 26, 2007 Report Share Posted September 26, 2007 Follow the link inm Dylanwad's post. It gives you everything. Quote Link to comment Share on other sites More sharing options...
cukaracha Posted October 1, 2007 Author Report Share Posted October 1, 2007 is it safe to leave the 9v battery connected 24/7 even i'm not using it for a prolonged period of time? Quote Link to comment Share on other sites More sharing options...
al heeley Posted November 5, 2007 Report Share Posted November 5, 2007 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. Quote Link to comment Share on other sites More sharing options...
billm90 Posted November 26, 2007 Report Share Posted November 26, 2007 I have wired up 10 leds without any resitors on a 9v, no issues. perhaps the battery life would last longer if I did. Quote Link to comment Share on other sites More sharing options...
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