Voltage Divider question - 6 from 12 Volts
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 14th August 2009, 12:30 PM #1 Brit01   diyAudio Member   Join Date: Jul 2008 Voltage Divider question - 6 from 12 Volts Guys, Can I use a simple voltage divider circuit to get 6 Volts out of a 12 volt transformer? I have a secondary 12V at 4 Amps. What would be suitable resistor values (and wattage) here to get 6 Volts at 2.5 amps min. from 12 volts? I want to supply a 6080 heater. I found this great calculator: http://www.educalc.net/876080.page
 14th August 2009, 01:34 PM #2 poynton   diyAudio Member     Join Date: Mar 2005 Location: UK Big Resistor needed !!!! To drop 6V at 2.5A requires 6 / 2.5 = 2.4ohms at 15watt rating Get a 6v transformer - less heat and probably cheaper Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !
 14th August 2009, 01:43 PM #3 wwenze   diyAudio Member   Join Date: Mar 2008 How about changing your circuit to two 6080s with the 12V feeding their heaters in series instead?
 14th August 2009, 01:44 PM #4 Brit01   diyAudio Member   Join Date: Jul 2008 Thks Andy. Thought it was going to take some heat. Although I may be able to get some 20W resistors for about 2 USD here. Iron is not cheap here. Let me find out.
Brit01
diyAudio Member

Join Date: Jul 2008
Quote:
 How about changing your circuit to two 6080s with the 12V feeding their heaters in series instead?
True. The other option I thought about.

If I've got 4 amps at 12V.

Then 2 x 2.5 amp heaters would be 5 amps.

But at 6 volts this would be ok yes?

 14th August 2009, 02:37 PM #6 Rafael L   diyAudio Member   Join Date: Nov 2008 Location: Brazil with any value of resistor, you make a divisor EX 0.5 ohms + 0.5 ohms... More the correct you use a Zener diode (1N5340)
Brit01
diyAudio Member

Join Date: Jul 2008
Quote:
 More the correct you use a Zener diode (1N5340)

sorry not sure what you mean.

A zener with each resistor? Or as a substitute to create the required resistance?

Rafael L
diyAudio Member

Join Date: Nov 2008
Location: Brazil
Quote:
 Originally posted by Brit01 sorry not sure what you mean. A zener with each resistor? Or as a substitute to create the required resistance?
You need not resitores, only one Zener diode, above 6 v leads, so does the voltage not exceed 6 v, look fig.
-his source is not symmetric, will need only one Zener diode....
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 14th August 2009, 03:14 PM #9 pjp   diyAudio Member     Join Date: Nov 2006 Location: under the rainclouds Rafael.luc I hope you know what you're talking about... 1N5340 is a 5W part which can pass approx. 800mA ...
Brit01
diyAudio Member

Join Date: Jul 2008
Quote:
 1N5340 is a 5W part which can pass approx. 800mA .
yep. I need something they will be capable of handling 5 amps at least.

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