fla 9 Posted February 7, 2005 Evenin all, I've got a digital thermometer for inside AND outside temps which I want to hardwire in. It uses a standard AAA size 1.5V battery. Any ideas where I can tap a 1.5V source eg by say stepping down the power from the cigarette lighter? If so, how's it done? I will be wiring in some blue leds so its on all the time the ignition is on. Cheers Quote Share this post Link to post Share on other sites
Supercharged 2 Posted February 7, 2005 Just stick a battery box in under the dash somewhere, you'll only need to change em every 2 years or so! Quote Share this post Link to post Share on other sites
fla 9 Posted February 8, 2005 Yeah, but with the leds on continously that'll drain it down in no time, hence the requirement for a separate supply. Quote Share this post Link to post Share on other sites
Andy Brookes 0 Posted February 8, 2005 http://the-corrado.net/.archive/forum/viewtopic. ... t=resistor i'm gussing you could use this as long as you know how many amps it will be pulling Quote Share this post Link to post Share on other sites
KieranD 0 Posted February 8, 2005 I was gonna say to use a step down transformer i.e 12v to 1.5v im sure Maplins would have something like that... Might help might not :) Quote Share this post Link to post Share on other sites
