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Topic: 9V PP3s... (Read 617 times) previous topic - next topic

JimboZA

Useless bloody things... I think it's flat already.
Arduino ethernet server here.... http://jimboza.gotdns.com:8085/

No PMs for help please

mmcp42

wow an electric slide rule
shame about the battery though!
there are only 10 types of people
them that understands binary
and them that doesn't

SirNickity

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.

westfw

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!

TomGeorge

Quote
Those smoke detectors that run 1year+ off a 9V battery are engineering marvels!


So are Fluke DMMs....

Tom..... :)
Everything runs on smoke, let the smoke out, it stops running......VK3DMK

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