Best way to reduce/convert 14 vdc to 6 vdc

[Larry W]

Many years ago I adapted a 9.6 volt Makita rechargeable battery to power a
portable radio (of approximately the same voltage). It's still going strong but
now I want to do the same thing to a new 6 volt radio using a Dewalt 14 volt
battery.

Is there an easy (not too expensive) way to reduce 14 to 6 volts DC?

Thanks for any help

Larry

 

[JeffM]

Larry W wrote:

Many years ago I adapted a 9.6 volt Makita rechargeable battery
to power a portable radio (of approximately the same voltage).[...]
now I want to do the same thing to a new 6 volt radio
using a Dewalt 14 volt battery.

http://groups.google.com/groups/search?q=voltage-regulator+ingroup:alt.electronics
http://groups.google.com/groups/search?q=LM317+ingroup:alt.electronics

You have to have a good idea of HOW MUCH CURRENT your device pulls.

 

[John Fields]

On Fri, 25 Jan 2008 21:17:49 -0500, Larry W
<webb@removethisrovatune.com> wrote:

Many years ago I adapted a 9.6 volt Makita rechargeable battery to power a
portable radio (of approximately the same voltage). It's still going strong but
now I want to do the same thing to a new 6 volt radio using a Dewalt 14 volt
battery.

Is there an easy (not too expensive) way to reduce 14 to 6 volts DC?

---
http://www.national.com/pf/LM/LM25575.html


--
JF

 

[Tim Perry]

"Larry W" <webb@removethisrovatune.com> wrote in message
news:479a984b$0$1108$4c368faf@roadrunner.com...

Many years ago I adapted a 9.6 volt Makita rechargeable battery to power a
portable radio (of approximately the same voltage). It's still going
strong but
now I want to do the same thing to a new 6 volt radio using a Dewalt 14
volt
battery.

Is there an easy (not too expensive) way to reduce 14 to 6 volts DC?

Thanks for any help

Larry'

1. cut the battery in half

2. attach wires

 

[Jakthehammer]

"John Fields" <jfields@austininstruments.com> wrote in message
news:0jemp3941c15uu2jgbl07969nks9p03e2v@4ax.com...

On Fri, 25 Jan 2008 21:17:49 -0500, Larry W
webb@removethisrovatune.com> wrote:

Many years ago I adapted a 9.6 volt Makita rechargeable battery to power
a
portable radio (of approximately the same voltage). It's still going
strong but
now I want to do the same thing to a new 6 volt radio using a Dewalt 14
volt
battery.

Is there an easy (not too expensive) way to reduce 14 to 6 volts DC?

The easiest way and cheap is:

Buy 1 PNP Germanium transistor and 1 resistor about 3K-Ohm 1/4 Watt to
limit the current and voltage going to your target load. The GE transistor
must have a 4-amp min rating. You must have a heatzink to support it. You
won't feel the heat on the resister, if you switch to NPN Silicon Power
transistor it will require bigger resistor, more heat on both component.



Jack.

 

[Jakthehammer]

"Jakthehammer" <jakthhmmr@aol.com> wrote in message
news:fo6r1i$bst$1@aioe.org...

"John Fields" <jfields@austininstruments.com> wrote in message
news:0jemp3941c15uu2jgbl07969nks9p03e2v@4ax.com...
On Fri, 25 Jan 2008 21:17:49 -0500, Larry W
webb@removethisrovatune.com> wrote:

Many years ago I adapted a 9.6 volt Makita rechargeable battery to power
a
portable radio (of approximately the same voltage). It's still going
strong but
now I want to do the same thing to a new 6 volt radio using a Dewalt 14
volt
battery.

Is there an easy (not too expensive) way to reduce 14 to 6 volts DC?



The easiest way and cheap is:

Buy 1 PNP Germanium transistor and 1 resistor about 3K-Ohm 1/4 Watt to
limit the current and voltage going to your target load. The GE
transistor
must have a 4-amp min rating. You must have a heatzink to support it.
You
won't feel the heat on the resister, if you switch to NPN Silicon Power
transistor it will require bigger resistor, more heat on both component.

Jack.

Do not try it on your radio/stereo device without checking the proper
voltage, first use a dummy load, i.e. Light Bulb 6V 1amp. If the bulb
blows up, you have exceed the limit, try 5K instead. Resistors are so
cheap in penny.