Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Making Twelve Volts Three

laserpyro

laserpyro

0
Joined
Jun 15, 2009
Messages
503
Points
0
thanks alot everyone.
i believe rogs will be the easiest method
pretty sure this will do the trick (Im a Link)
thanks everyone
 





rog8811

rog8811

0
Joined
Jul 24, 2007
Messages
2,749
Points
0
Cheaper than the two resistors required to make a voltage divider?
Click to expand...

Not cheaper, just another option;)
@ laserpyro, you can get cheaper than that but if you are ok with the cost it will do the job.

Regards rog8811
 
Cyparagon

Cyparagon

0
Joined
Sep 12, 2007
Messages
9,399
Points
113
I'm willing to bet those adapters USE voltage dividers. Why are we afraid to DIY all of a sudden?
 
HIMNL9

HIMNL9

0
Joined
May 26, 2009
Messages
5,318
Points
0
No, those adapters are switching DC-DC converters ..... for use network resistors dividers at 1500mA, you need 150 or 200 watt resistors (and probably can also cook an egg on them, LOL)
 
lasersbee

lasersbee

0
Joined
Sep 20, 2008
Messages
17,622
Points
113
Cyparagon said:
I'm willing to bet those adapters USE voltage dividers. Why are we afraid to DIY all of a sudden?
Click to expand...

To divide 12 volts down to 3 volts.. those extra 9volts need to be
dissipated as heat... and the amount of heat depends on the final load...

To do that.... requires some high Wattage and physically large
Resistors if you want to build a Resistive Voltage Divider....

[EDIT]
HIMNL9... is correct...


Jerry
 
Last edited:
dr-ebert

dr-ebert

0
Joined
Mar 8, 2009
Messages
710
Points
0
A voltage divider doesn't work. It's ONLY for dividing voltages. They're not usable if you want to draw current. All you need to do is to apply Ohms law to them to see it.
 
You must log in or register to reply here.




Top