voltage drop across resistor

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=100107
Printed Date: May 07, 2025 at 7:50 AM

Topic: voltage drop across resistor

Posted By: tedmond
Subject: voltage drop across resistor
Date Posted: December 16, 2007 at 7:50 PM

hey, this is my first thread in this section @ 12volt. Well, for school, i have a project that is model car build. Im wondering, can 12volts be dropped to the voltage of 2 double A batteries (AA), if so, what resistor size would i need. Currently, on my project, i have a 12volt 500ma power supply that is powering a relay, and an alarm module - no siren,lights etc...just need the remote and aux function. I want to power a device i have that uses 2 AA batteries off a 12volt source. I dont know if i can be done, but if so, what resistor size would i need? and any tips on how to wire it up properly. I have everything else wired cuz i do alarms and audio. never really messed with resistors, so any help is appreciated.

Thanks

Replies:

Posted By: i am an idiot
Date Posted: December 16, 2007 at 8:32 PM

What kind of device is it that you are trying to power? How long of a time will the device be on? A voltage regulator will be a more stable way to do this.

https://www.nteinc.com/specs/1900to1999/pdf/nte1904.pdf

Posted By: tedmond
Date Posted: December 16, 2007 at 9:23 PM

its a wirless receiver. I stripped it from my wireless headphones. I will only be powering it for less than 5 mins tops.

Posted By: tedmond
Date Posted: December 16, 2007 at 9:25 PM

i dont have the time to pick up a voltage regulator, thats the only thing im kinda stuck on. I dont mind using 2 AA batteries, but its just it takes up room. thanks for the helpful reply