Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 29

Thread: Help with 12V to 5V setup, having powering issues.

  1. #11
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    you'll need a transistor-- look around the M2 section. there are a couple of threads that talk about a solution to the low output of the anti-thump pin(where it won't have enough juice to turn on some amps)-- that circuit should be the exact thing you'll need.

  2. #12
    Who am I? HiJackZX1's Avatar
    Join Date
    Jul 2007
    Location
    Miami
    Posts
    6,557
    Well the PAC has enough juice to turn on the relay, the problem is that its a pulse device so its turning off the relay off and on really fast. I figured that if I put a capacitor, then it would store the pulse and release it as constant, or do I have things wrong?
    Nirwana Project, the Android/Win 7 hybrid system!

    1X Ainol Novo Flame Tab
    4X MK808b
    3x Perixx Touchpads
    3x 7 inch Screens
    1X 7 inch motorized Screen
    1x Win 7 PC

  3. #13
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    ah...

    i was going to start on the explanation of how to make it work, but honestly, it is much more work then it is worth. you'd need a diode to prevent the voltage from going back into the PAC, a resistor to keep the voltage going slowly through the relay, a capacitor to store the charge, and a least a weekend to figure out what values of resistor and capacitor are the correct ones for this application...

    just get one of the devices i linked to before-- that will solve the problem and give you a larger adjustment window if the 2 seconds isn't enough..
    Last edited by soundman98; 10-17-2011 at 06:57 PM.

  4. #14
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118
    Thru a diode to a cap to the PAC....

    Don'tcha hate products without specs (TR4) like input current & impedance, time delays etc.
    (Hence why so many DIY with web circuits.)

  5. #15
    Who am I? HiJackZX1's Avatar
    Join Date
    Jul 2007
    Location
    Miami
    Posts
    6,557
    Quote Originally Posted by OldSpark View Post
    Thru a diode to a cap to the PAC....

    Don'tcha hate products without specs (TR4) like input current & impedance, time delays etc.
    (Hence why so many DIY with web circuits.)
    A diode to a cap to the PAC, or did you mean the relay?

    Well I know the time delay is 2 seconds on the PAC.
    Nirwana Project, the Android/Win 7 hybrid system!

    1X Ainol Novo Flame Tab
    4X MK808b
    3x Perixx Touchpads
    3x 7 inch Screens
    1X 7 inch motorized Screen
    1x Win 7 PC

  6. #16
    Who am I? HiJackZX1's Avatar
    Join Date
    Jul 2007
    Location
    Miami
    Posts
    6,557
    Is this what I am doing?
    Attached Images Attached Images  
    Nirwana Project, the Android/Win 7 hybrid system!

    1X Ainol Novo Flame Tab
    4X MK808b
    3x Perixx Touchpads
    3x 7 inch Screens
    1X 7 inch motorized Screen
    1x Win 7 PC

  7. #17
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    yes, it would need to be on the output side of the PAC.

    though, oldspark will need to confirm, i thought that a resistor would be needed in something like this to prevent a smaller-sized capacitor from discharging too fast between pulses..

  8. #18
    Who am I? HiJackZX1's Avatar
    Join Date
    Jul 2007
    Location
    Miami
    Posts
    6,557
    What is the purpose of the diode though? To keep the current from going backwards?
    Nirwana Project, the Android/Win 7 hybrid system!

    1X Ainol Novo Flame Tab
    4X MK808b
    3x Perixx Touchpads
    3x 7 inch Screens
    1X 7 inch motorized Screen
    1x Win 7 PC

  9. #19
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118
    Quote Originally Posted by some stupid OldFart
    Thru a diode to a cap to the PAC....
    Sorry - my bad - I meant "Thru a diode to a cap to the device...." (ie, relay).

    The point being the diode.
    As per HiJack's diagram, from PAC TR4 thru diode to cap & relay.
    The PAC charges the cap (hopefully without stressing the PAC's output).
    When charged enough, the relay turns on (ie, when voltage across the cap exceeds the relay "turn on" voltage.

    When the PAC turns off, the diode prevents the cap discharging thru the PAC. It must discharge thru the relay coil etc.

    The 10k fixed resistor is not needed - it is only there to discharge the cap.
    But the (say) 60R to 250R (R=Ohm) coil resistance "swamps" the 10k (eg, parallel R = (10k x 250)/(10k+250) = 243R = close to the 250R)
    - ie, the cap discharges through the lowest resistance (250) much quicker than the 10,000 resistor.


    If only audio buffs could fit a diode between their supply (battery, alternator) and the cap and amplifier.... (LOL!)

  10. #20
    Who am I? HiJackZX1's Avatar
    Join Date
    Jul 2007
    Location
    Miami
    Posts
    6,557
    Thanx for clearing that up OldSPark. I actually understand this time too! LOL
    Nirwana Project, the Android/Win 7 hybrid system!

    1X Ainol Novo Flame Tab
    4X MK808b
    3x Perixx Touchpads
    3x 7 inch Screens
    1X 7 inch motorized Screen
    1x Win 7 PC

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. New Setup and P2140 is not powering PC
    By brianteel in forum Power Supplies
    Replies: 4
    Last Post: 12-13-2009, 04:04 PM
  2. M2-ATX Powering Issues
    By kraimer21 in forum Power Supplies
    Replies: 13
    Last Post: 06-01-2009, 07:50 AM
  3. Replies: 7
    Last Post: 03-18-2008, 09:25 PM
  4. Powering XM Direct for Laptop Setup?
    By tiomka in forum Car Audio
    Replies: 11
    Last Post: 05-31-2006, 11:36 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •