6v drill battery

[Dazza]

Thankfully no skunks. We do have bats, their called flying foxes/fruit bats fairly large, we do have a few colonies here in Bundaberg, and they litter the sky late in the afternoon. When I lived up north Townsville area, when I was very young we use to go camping at a place called Rocky ponds, when the bats came over late in the afternoon you could not see in any direction, where they started or ended. They were so thick at times it would go dark, and I'm not kidding. My father would take a couple of shots at them with a 22 calibre rifle, as soon as you heard the rifle go off, the bat that he was aiming for would circle the bullet . That's some mighty fine radar equipment 8).

I am a big nature fan, and I would love to be able to listen in on the bats ultrasonics, I hope you are planning on posting that circuit on these forms somewhere ;D.

 

[stuee]

ok how would i sort this for 12v cig light in car, to the 6v the battery needs.
http://www.hut.fi/Misc/Electronics/circuits/lm317.html

thanks

 

[stuee]

Ok ive found this in the shed. can i convert it....?
ITs a Arlec CB146 Ni-CD DC Car Fast Charger for battery packs.

Details.
Negitive delta peak charger with auto switching Fast / normal

Reset by connecting new ni-cd pack
40 min safety timer
Electronic protection from short circuit, overloads or wrong polarity..

Fast charge current -5A
Normal charge current- 320mA
For 6-7 cells. 1,2Ah (16 mins) -3Ah(40mins)
7.2v - 8.4v

Could i use this and mabey stick a resistor to bring it down to 6v 1A
is so what should i use,,
Thanks for all your help so far in this Funny but epic journy.

Hey by the way i came over to aus from the uk 3 years ago so i know what its like on both sides of the world. and i must say, the blood isnt rushing to my head

 

[Dazza]

Sorry stuee, I haven't been much help ;D, I'll have a search and see if I can come up with something.

 

[Dazza]

Have a look at this one .

http://www.uoguelph.ca/~antoon/gadgets/carnc12.htm

 

[Dazza]

This one might be better ;D.

http://www.uoguelph.ca/~antoon/circ/bcgla2.htm

 

[stuee]

thanks dazza .exactly what i needed, i searched for ages and couldnt find anything much..

Only one question, could i stick 12v incar input on this?
if not how can i..
Thanks again

 

[audioguru2]

Hi Stuee,
So you're really a Brit. Have you settled into being an Aussie yet?
Maybe all the blood leaked out of your head 3 years ago. ;D

That's a really nice Ni-Cad fast charger that you found, but it isn't suitable for your battery's chemistry. If you simply add a resistor to its output, it might laugh and put out 5A anyway. You might get splattered with acid. :'(

That LM317 project will work fine to charge your battery. Use a pot for R2 to adjust its output voltage to 6.9V, and use a fairly large heatsink on the LM317.

Hi Dazza,
Tony Van Roon's circuits are good (his university is my nearby one) and thanks for the link that I lost. The 2nd circuit would be perfect to charge Stuee's battery but it needs a regulated 10V input.
It would be difficult to get regulated 10V from a 12V car batt. ???

I'm still thinking about a downconverter to hear bat noises. I doubt that they'll speak to me, probably just abrupt sonar "chirps". Maybe I'll go one step further and "FM-detect" their noises.

I just finished another new project. If I figure-out how to use my son's camera, I'll post it today. ;D ;D ;D

 

[steven2]

audio guru ive got the circuits for the ultrasonic bat detecter some where, i used to live in queensland australia and have seen large friut bats , even one with a wing span of 5ft from wing tip to wing tip, and and when i was a kid i was standing in the back yard watching a line of bats fly over in a strait line and about 20 feet wide and a kilometer long so silent and flying strait right over our house and there was hundreads and thousands of them, my uncle used to wrap tinsell, thats the stuff you put around your christmass tree, around his paw paw tree to deflect the friut bats radar so they cant home in on his paw paw tree

 

[ante1]

http://pw1.netcom.com/~t-rex/BatDetector.html

 

[Dazza]

Audioguru, couldn't stuee use a voltage regulator (LM350K) it can handle 3A, for the 10V required for the 6-Volt gel cell charger.

You have me curious of what your new finished project is, Do you want us to guess what it might be. may be a skunk detector? ;D.

 

[audioguru2]

Hi Dazza,
Stuee's battery doesn't need 3A, it is rated for, "Initial current: less than 1.2A". An LM317 with this low input voltage will easily provide 1.2A (It reduces its output current with an input to output voltage more than 15V).
For the circuit you posted that needs a 10V regulated supply, an LM350 or LM317 "drops-out" with a 12V input and a 10V output and therefore operates poorly. Stuee might forget to start the engine to boost the voltage up to where they regulate properly.

My eyes and nose are skunk detectors. My new project was posted yesterday. It is unique, works very well and it and its pics have a link on our home page. Have a look.