how to get enough power?

Christoph · 02-07-02, 04:34 PM

I'm going to light and power my bong cooler, and I want to do it from my PS. Below are the total volts and amps that the LEDs and fan will require.
The LEDs will take up 20.4V and 120 mA (total), and the fan will use 12V and 450 mA.

Christoph · 02-08-02, 12:41 AM

I've taken a beginning electronics class, but it was a while ago, and I need a refresher on how to figure out what kind of resistors I'll need.

YMAN · 02-08-02, 08:45 PM

The fan no problom it only uses .45 of an amp.
The leds however use 20v, not easily achieved
on a power supply with the highest line being 12v.

How many leds are there, are you running them in
series, or parallel? if you are in series, try splitting
them into a parallel and series combos, that way
you will not need a resistor or any other component.

Christoph · 02-08-02, 10:39 PM

When I tried to order, I found out that Hosfelt changed some of their prices and didn't have everything online that they have in their catalog, so I might have to get creative. Would it be possible to somehow get enough power for 10-15 LEDs ( about 3V and 20 mA a piece) without making a major dent on the power supply? I know that's a lotta volts, but is it also way too much of a draw on my PS?

YMAN · 02-09-02, 07:55 AM

as far as the amps dont worry they use .02 amps a piece,
not a problom, Here is my idea as far as the leds.

I am sorry about the BMP file but the JPG came out
too blurry.

When you open the picture, you will see that the + is
split into 3 lines, otherwise known as parallel. Then,
their is 4 leds in series on each parallel so the leds
will work on 12v! Their are 12 led lights on this schematic,
but if you add more paralells and keep it 4 in series you
can add more leds in increments of 4, without any resistors.

Parallel is when you have 1 wire that is split into 2 or more.
Series is when power goes from the output of one device, to
the input of another device, thus increasing the voltage
potential.

Christoph · 02-09-02, 02:15 PM

Thanks YMAN! That sure makes my life easier as far as modding goes. Here's a copy of the picture in .png format. If you do much image editing, it might be worth your while to download the GNU Image Manilulation Program (Kinda like a free photoshop).

YMAN · 02-09-02, 05:51 PM

You are most welcome!

I'll give that program a try, thanks.

02-07-02, 04:34 PM	Thread Starter #1
Christoph JAPH Senior Join Date: Oct 2001 Location: Redmond, WA	how to get enough power? I'm going to light and power my bong cooler, and I want to do it from my PS. Below are the total volts and amps that the LEDs and fan will require. The LEDs will take up 20.4V and 120 mA (total), and the fan will use 12V and 450 mA. __________________ FoldSig \| Heatware \| Alt OS FAQWiki \| JAPH \| ADO "Coming onto the forums after you've had a concussion is prolly not a good idea, but I'm doin' it anyways!" -dark_15 Last edited by Christoph; 02-08-02 at 12:41 AM.
	QUOTE Thanks

02-08-02, 12:41 AM	Thread Starter #2
Christoph JAPH Senior Join Date: Oct 2001 Location: Redmond, WA	I've taken a beginning electronics class, but it was a while ago, and I need a refresher on how to figure out what kind of resistors I'll need. __________________ FoldSig \| Heatware \| Alt OS FAQWiki \| JAPH \| ADO "Coming onto the forums after you've had a concussion is prolly not a good idea, but I'm doin' it anyways!" -dark_15
	QUOTE Thanks

02-08-02, 08:45 PM	#3
YMAN Member Join Date: Aug 2001 Location: West Palm Beach, Florida	The fan no problom it only uses .45 of an amp. The leds however use 20v, not easily achieved on a power supply with the highest line being 12v. How many leds are there, are you running them in series, or parallel? if you are in series, try splitting them into a parallel and series combos, that way you will not need a resistor or any other component.
	QUOTE Thanks

02-08-02, 10:39 PM	Thread Starter #4
Christoph JAPH Senior Join Date: Oct 2001 Location: Redmond, WA	When I tried to order, I found out that Hosfelt changed some of their prices and didn't have everything online that they have in their catalog, so I might have to get creative. Would it be possible to somehow get enough power for 10-15 LEDs ( about 3V and 20 mA a piece) without making a major dent on the power supply? I know that's a lotta volts, but is it also way too much of a draw on my PS? __________________ FoldSig \| Heatware \| Alt OS FAQWiki \| JAPH \| ADO "Coming onto the forums after you've had a concussion is prolly not a good idea, but I'm doin' it anyways!" -dark_15
	QUOTE Thanks

02-09-02, 07:55 AM	#5
YMAN Member Join Date: Aug 2001 Location: West Palm Beach, Florida	as far as the amps dont worry they use .02 amps a piece, not a problom, Here is my idea as far as the leds. I am sorry about the BMP file but the JPG came out too blurry. When you open the picture, you will see that the + is split into 3 lines, otherwise known as parallel. Then, their is 4 leds in series on each parallel so the leds will work on 12v! Their are 12 led lights on this schematic, but if you add more paralells and keep it 4 in series you can add more leds in increments of 4, without any resistors. Parallel is when you have 1 wire that is split into 2 or more. Series is when power goes from the output of one device, to the input of another device, thus increasing the voltage potential.
	QUOTE Thanks

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02-09-02, 02:15 PM	Thread Starter #6
Christoph JAPH Senior Join Date: Oct 2001 Location: Redmond, WA	Thanks YMAN! That sure makes my life easier as far as modding goes. Here's a copy of the picture in .png format. If you do much image editing, it might be worth your while to download the GNU Image Manilulation Program (Kinda like a free photoshop). __________________ FoldSig \| Heatware \| Alt OS FAQWiki \| JAPH \| ADO "Coming onto the forums after you've had a concussion is prolly not a good idea, but I'm doin' it anyways!" -dark_15
	QUOTE Thanks

02-09-02, 05:51 PM	#7
YMAN Member Join Date: Aug 2001 Location: West Palm Beach, Florida	You are most welcome! I'll give that program a try, thanks.
	QUOTE Thanks

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