stepdown dc/dc power

[peter]

Hello all
Just have a techniacl question. Over the passed 2 days I'm trying to
think of a way to build a power suppyly for may magellan sportrak
map(gps) which needs 3.8vdc-4.2vdc that will be converted from cars
12vdc. What is the best way to put that power supply togther ueseing
easy to find.
Thanks in adcance.

 

[Rheilly Phoull]

"peter" <peter_chans@hotmail.com> wrote in message
news:bf5dca45.0408242207.249b58e7@posting.google.com...

Hello all
Just have a techniacl question. Over the passed 2 days I'm trying to
think of a way to build a power suppyly for may magellan sportrak
map(gps) which needs 3.8vdc-4.2vdc that will be converted from cars
12vdc. What is the best way to put that power supply togther ueseing
easy to find.
Thanks in adcance.

Look up the LM317, that is an adjustable voltage regulator just made for YOU
. Very simple circuit to do what you want, with a bit of ingenuity it
should be able to fit it inside a generous cigarette holder plug.


--
Regards ........... Rheilly Phoull

 

[CFoley1064]

Subject: Re: stepdown dc/dc power
From: "Rheilly Phoull" Rheilly@bigpong.com
Date: 8/25/2004 3:47 AM Central Daylight Time
Message-id: <2p321uFgf4srU1@uni-berlin.de


Look up the LM317, that is an adjustable voltage regulator just made for YOU
. Very simple circuit to do what you want, with a bit of ingenuity it
should be able to fit it inside a generous cigarette holder plug.


--
Regards ........... Rheilly Phoull

____
+ IN| |OUT +
o----o----| 317|----o------o------o LM317T (Front View)
| |____| | | .---------.
| ADJ| .-. | | |
| | 240| | | | o |
.1uF|+ | | | 1uF|+ | |
--- | '-' --- |---------|
--- | | --- | |
12V | o-------' | 4.2V | |
| | | | |
| .-. | | |
| | | | '---------'
| | |560 | | | |
| '-' | | | |
- | | | - | | |
o----o------o--------------o------o A O I
D U N
J T
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

Good luck
Chris

 

[Rich Grise]

peter wrote:

Hello all
Just have a techniacl question. Over the passed 2 days I'm trying to
think of a way to build a power suppyly for may magellan sportrak
map(gps) which needs 3.8vdc-4.2vdc that will be converted from cars
12vdc. What is the best way to put that power supply togther ueseing
easy to find.
Thanks in adcance.

You don't say what country you're in, but RS has various car lighter
adapters with the regulator already in them, I'm pretty sure.

Good Luck!
Rich

 

[JeB]

On 24 Aug 2004 23:07:33 -0700, peter_chans@hotmail.com (peter) wrote:

Hello all
Just have a techniacl question. Over the passed 2 days I'm trying to
think of a way to build a power suppyly for may magellan sportrak
map(gps) which needs 3.8vdc-4.2vdc that will be converted from cars
12vdc. What is the best way to put that power supply togther ueseing
easy to find.
Thanks in adcance.

adaptors which provide up to 1 amp at a wide selection of voltages and
with an assortment of plug adaptors are very affordable.

 

[peter]

cfoley1064@aol.com (CFoley1064) wrote in message news:<20040825072902.04869.00002066@mb-m05.aol.com>...

Subject: Re: stepdown dc/dc power
From: "Rheilly Phoull" Rheilly@bigpong.com
Date: 8/25/2004 3:47 AM Central Daylight Time
Message-id: <2p321uFgf4srU1@uni-berlin.de


Look up the LM317, that is an adjustable voltage regulator just made for YOU
. Very simple circuit to do what you want, with a bit of ingenuity it
should be able to fit it inside a generous cigarette holder plug.


--
Regards ........... Rheilly Phoull

____
+ IN| |OUT +
o----o----| 317|----o------o------o LM317T (Front View)
| |____| | | .---------.
| ADJ| .-. | | |
| | 240| | | | o |
.1uF|+ | | | 1uF|+ | |
--- | '-' --- |---------|
--- | | --- | |
12V | o-------' | 4.2V | |
| | | | |
| .-. | | |
| | | | '---------'
| | |560 | | | |
| '-' | | | |
- | | | - | | |
o----o------o--------------o------o A O I
D U N
J T
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

Good luck
Chris

Did not have chance to read the post, but I found some time now.
Thanks to all. This is a great solution opposed to buying a $199.00
cable from a store and I believe you answered many purple's question.
Thanks again