Useless bloody things... I think it's flat already.
wow an electric slide rule
shame about the battery though!
I have a wireless transmitter for my bass that uses 9v batteries. When I was actively playing in local bands, I would go to a gig with a fresh one in the body pack, and a spare in my case. If there was anything left in the battery after the gig, I would use it up at our next practice. In comparison, my wireless receiver (for monitoring) used two AAs and would last for hours and hours and hours.
I tried using NiMH rechargeable 9v cells, and I'll tell you this... it's no wonder they're hard to find. They make alkaline 9v cells look like an endless fountain of energy. I just gave up when the top cap came off one of the cells trying to unplug it from the charger. Totally useless.
Yes. There was an old App-note from Linear technology that pointed out that 2*AA batteries contained significantly more energy, at less cost and about the same space, as a 9V battery. ESPECIALLY if you were going to regulate your 9V down to 5V with a linear regulator, and used their new switchmode converter chip to step the 3V UP to 5V instead.
Those smoke detectors that run 1year+ off a 9V battery are engineering marvels!
Those smoke detectors that run 1year+ off a 9V battery are engineering marvels!
So are Fluke DMMs....
Tom..... 