Connect with us

stepdown dc/dc power

Discussion in 'Electronic Basics' started by peter, Aug 25, 2004.

Scroll to continue with content
  1. peter

    peter Guest

    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.
     
  2. 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.
     
  3. CFoley1064

    CFoley1064 Guest

    Subject: Re: stepdown dc/dc power
    ____
    + 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
     
  4. Rich Grise

    Rich Grise Guest

    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
     
  5. JeB

    JeB Guest

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

    peter Guest

    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
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-