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Author Topic: Elektrickery help!!  (Read 1127 times)

Ian K

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Elektrickery help!!
« on: May 30, 2015, 05:19:56 PM »

Hi,

Do any of you guys know how I could drop a 14.8 volt lipo supply, down to 12 volts for a pc cooling fan.

I am running other things from the lipo at the standard voltage, I just need to reduce down a separate circuit for the 12 volt fan.
Electronics is not something I am very knowledgeable about :embarrassed:

Maybe a variable pot or a fixed rating resistor? I would prefer a variable pot, to reduce/increase air flow speed. I just don't know what rating to use, as it all seems mumbo jumbo to me......sorry!

Thanks in advance

Ian
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inertia

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Re: Elektrickery help!!
« Reply #1 on: May 30, 2015, 05:29:15 PM »

Ian
Knock yerself out, m'duck! http://www.hobbytronics.co.uk/voltage-regulator-l7812 The circuit is on the Datasheet.
Dave M
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Netleyned

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Re: Elektrickery help!!
« Reply #2 on: May 30, 2015, 05:31:22 PM »

Try it at the stated voltage.
Using a resistor fixed or variable will introduce more heat.
I am assuming the cooling fan is to cool.
A cheapo esc, forward only and small current rating
would give you control of the fan speed and therefore
cooling


Or do as DM has posted  :-)) :-))


Ned


Ned

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inertia

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Re: Elektrickery help!!
« Reply #3 on: May 30, 2015, 05:32:37 PM »

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Umi_Ryuzuki

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Re: Elektrickery help!!
« Reply #4 on: May 30, 2015, 05:57:11 PM »

Something like the Dimension Engineering voltage regulators would work.
They are specified as "switching" regulators, and don't dump the excess voltage as heat, as far as I can tell.


https://www.dimensionengineering.com/products/de-swadj


 :-)

Ian K

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Re: Elektrickery help!!
« Reply #5 on: May 30, 2015, 07:51:40 PM »

Hi,

Thanks for all the input so far chaps. The fan is used as a positive pressure blower unit, for a home built smoke generator.
The 14.8 volt lipo, supplies the power to the twin heating coils.

I just need to tweak the brush less PC fan speed, to get a varying flow of smoke.

Ian
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