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Old 27th July 2008, 01:04 AM   #321
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How long do you suppose the batteries will last?
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Old 27th July 2008, 04:48 AM   #322
lineup is offline lineup  Sweden
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Quote:
Originally posted by Nelson Pass
How long do you suppose the batteries will last?
Battery will last until empty ... or close to.

nelson my old partner
did you see this following nice post of mine in this topic
it is written like from a friend to a !fiend!

I wish for to have a response (= positive! feedback) from you, yourself
from whom I adressed

thanks, Lineup Audio Lab - a bit drunk on sherry wine - this evening ....

Quote:
Originally posted by lineup
Great you have published your B1 papers, Nelson.
thanks.

Keeep on going oldtimer. (although I am tiny bit older born in May 1951)
Very nice to see age is not something that can kill off creativity.
Good hope for all young audio diy guys.
This hobby is something they can do for very long time.

Maybe until their final breath .. on that Very Last Day

Lineup - now waiting for the investigations and findings that Mr Pass will do in B2
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Old 27th July 2008, 07:42 AM   #323
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Quote:
Originally posted by Nelson Pass
How long do you suppose the batteries will last?
Typical 9V battery is about 500 mAh, with a 20mA drain, and 2 batteries, you'd expect 40-50 hours? Unless I'm oversimplifying?

-d
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Old 27th July 2008, 08:30 AM   #324
Vix is offline Vix  Yugoslavia
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Quote:
Originally posted by Nelson Pass
How long do you suppose the batteries will last?
There's an option to have two rechargeable 9 v Ni-Mh ones. Then build a trickle charger that would charge when the B2 is off...

On the other hand, a cheaper and less complicated solution would be to use 7812 and 7912 regs. (I'll most probably go for this one...)

Thanks,

Vix
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Old 27th July 2008, 12:14 PM   #325
Bobken is offline Bobken  United Kingdom
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QUOTE:

"Keeep on going oldtimer. (although I am tiny bit older born in May 1951)"

Huh, What do you know, you young whippersnappers?

Regards from a proper Old-timer,
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Old 27th July 2008, 12:28 PM   #326
udailey is offline udailey  United States
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Well, if you divide 20 into 500 you will end up with 25. However, while they should run a little less than that you have to take into account the proper burn in time of a 9V battery to get the best sonics
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Old 27th July 2008, 12:45 PM   #327
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Vix


There's an option to have two rechargeable 9 v Ni-Mh ones. Then build a trickle charger that would charge when the B2 is off...

On the other hand, a cheaper and less complicated solution would be to use 7812 and 7912 regs. (I'll most probably go for this one...)

Thanks,

Vix
ya lazy greenhorn

proper shunt reg is better than batteries
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Old 27th July 2008, 01:19 PM   #328
Vix is offline Vix  Yugoslavia
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Quote:
Originally posted by Zen Mod


ya lazy greenhorn

proper shunt reg is better than batteries
I agree...

Me lazy
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Old 27th July 2008, 02:32 PM   #329
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Quote:
Originally posted by udailey
Well, if you divide 20 into 500 you will end up with 25. However, while they should run a little less than that you have to take into account the proper burn in time of a 9V battery to get the best sonics
...but 2 batteries for a total of 1000 mAh.

Course you could always run your batteries in on something a little less demanding - in this application I prefer a pair of 12.6V car batteries, and initially I wait until it's -30C (-22F) and just start an SUV over and over for a couple of hours. I find the Motomaster "Eliminator" series of batteries from Canadian Tire provide the best sonics. Also, you should use pure copper jumper cables, and be sure to design your chassis to make safe usage of car battery terminals.

-d
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Old 27th July 2008, 02:40 PM   #330
udailey is offline udailey  United States
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Only if you are running at 9V. I figured you were running at 18 which would put you back at 500ma.
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