((At the present time for my needs I merely use 2 for a $1 9v batteries )(even cheap batteries there are better and really crappy and cheap !)) Lucky so far one brand that I get last about a week when left on all the time....after that start to get unreliable readings ( :>) Norm[ Parent ]
A 7809 isn't fancy. It worked for resistors and batteries other than the one powering the 7809.
It could not read the voltage of the battery powering the 7809. Took about a half a nano-second to know that was a very bad idea! LOL[ Parent ]
