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Author Topic: Voltage regulators?  (Read 1586 times)

Rex Hunt

  • Guest
Voltage regulators?
« on: October 18, 2008, 07:30:58 AM »

Can one of the 'enlightened' please post a tutorial showing us in layman's terms......how to use


1...........Voltage regulators to drop    say 12v to 3,5,or 6 volts,

2...........How to use a variable voltage Regulator chip as sold by Muppetlins..............their staff are now just till operators!

 :(




Rex
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Sandy Calder

  • Guest
Re: Voltage regulators?
« Reply #1 on: October 18, 2008, 08:29:08 AM »

http://cache.national.com/ds/LM/LM117.pdf for a variable regulator
Don't omit the two diodes in page 9 or it can be damaged if you short the input.
For the LM317 you may need 2 volt in excess of your output voltage if you draw 1 amp.
If you have a spare diode, connect it in series:Anode to +v ,Cathode to LM317 input.

You are FAR better off using LM2940 or LM2930 series regulators. Avoid the 7805s and 6s and LM340s as they are more easily damaged and dont protect the load on reverse connection unless you use a series diode.
A good idea is to use fixed regulators too as you forget to change the voltage

Why the  :( ?

Regards
Sandy Calder
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offshore1987

  • Guest
Re: Voltage regulators?
« Reply #2 on: October 18, 2008, 09:46:01 PM »

Hi

For an easyer answer lol though its from the u.s which is poo

http://www.harbormodels.com/site08/main_pages/power_distribution_panel.htm


Hope it might help, all the best
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Rex Hunt

  • Guest
Re: Voltage regulators?
« Reply #3 on: October 19, 2008, 12:02:44 AM »

Hi

For an easyer answer lol though its from the u.s which is poo

http://www.harbormodels.com/site08/main_pages/power_distribution_panel.htm


Hope it might help, all the best

Nice but pricey!
I know the exchange rate is *********** but!
Thanks anyway

Rex
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Rex Hunt

  • Guest
Re: Voltage regulators?
« Reply #4 on: October 19, 2008, 12:19:25 AM »



Why the  :( ?

Regards
Sandy Calder

Cos I should know.....but the Apprenticeship finished in '73..........and I haven't used that gen since!

Brain-fade!


Thanks for the handy link though Sandy


Rex

 :-))
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Sandy Calder

  • Guest
Re: Voltage regulators?
« Reply #5 on: October 19, 2008, 08:03:42 AM »

Any specific questions on the data sheets then post a link and just ask away but give as much info as possible.

Regards
Sandy Calder
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