how do you convert 9V to 3.6V
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 27th March 2005, 12:27 PM #1 Gizmotech   diyAudio Member   Join Date: Mar 2005 how do you convert 9V to 3.6V how do you convert 9V to 3.6V using resistors and will it work? Any help appreciated. In ther words, how do I do the sums?
 27th March 2005, 12:48 PM #2 sivan_and   diyAudio Member     Join Date: Dec 2004 Location: B'lore/ Calicut India Whatz the required load curent...Whether regulation necessary.. __________________ SivanandBalan
 27th March 2005, 01:56 PM #3 Gizmotech   diyAudio Member   Join Date: Mar 2005 how do you conver 9V to 3.6V it's to run 3.6V LED from a 9V battery
 27th March 2005, 01:57 PM #4 paulb   diyAudio Member   Join Date: Jun 2001 Location: Calgary http://www.allaboutcircuits.com/vol_1/chpt_6/1.html Note that your load (whatever you need the 3.6V for) is one of the divider resistors. You need to know its resistance, or how much current it draws at 3.6V (R=V/I). If the load changes (draws more or less current), its voltage will also change. Using resistors only to drop voltage has no voltage regulation characteristic.
 27th March 2005, 02:08 PM #5 sivan_and   diyAudio Member     Join Date: Dec 2004 Location: B'lore/ Calicut India Many options: Constant current source or Exotic LED drivers (white) from National.com or ti.com texas inst Or simple current limitting resistor>>>>9-3.6/ LED current in milliamp = resistance in Kohms. For 10ma LED Current R=540 OHMS (560 OHMS nearest commercial value) __________________ SivanandBalan
 27th March 2005, 05:44 PM #6 Shoog diyAudio Member     Join Date: Aug 2002 Location: Eire If all you are doing is lighting a few LEDs then use a simple series resistor to derive the correct current. The total voltage across the arrangement is totally unimportant, its the current that counts. Shoog
 27th March 2005, 05:51 PM #7 lgreen   diyAudio Member     Join Date: May 2003 Location: San Diego, USA LED Equation The LED equation is here. Just use 1 resistor in series, use the formula. For a typical amber LED Vf is about 2V, and If is about 20mA. So for 9V I get 350 ohms. To be safe, I'd use 500 or 1K. They get pretty bright even without using them to their max specs.

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