Shop OBEX P1 Docs P2 Docs Learn Events
Question about the C3 relating to the power supply input? — Parallax Forums

Question about the C3 relating to the power supply input?

RavenkallenRavenkallen Posts: 1,057
edited 2011-02-05 16:12 in Propeller 1
Uh, hello everybody:).. Does anybody know if those two plated through holes (that are right beside the barrel jack), are power inputs? I assume they are based upon their location in relation to the barrel jack, but i wanted to be sure. If so, i further assume that the input power would still pass through the regulator circuitry? I eventually want to power the device by means other than USB and i don't have anything that will fit the in the jack. Thanks in advance(PS. i am working on a game for the C3 that i will be releasing soon)

Comments

  • Duane DegnDuane Degn Posts: 10,588
    edited 2011-02-04 10:05
    Looking at the copper layers, I think the corner hole is ground and the other hole is after the 5V regulator but before the switch.

    The copper layers are available on the C3 ftp site under Designs.
  • schillschill Posts: 741
    edited 2011-02-04 10:58
    It looks like you can feed 5V to that hole if you have it available. If you have a higher voltage, you could always remove the barrel jack and solder to those pads or just solder wires on the pads next to the jack for that matter.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2011-02-04 11:13
    I often solder wire to the bottom of the jack on Propeller Proto Boards. I've also seen other do the same. In fact, I did this yesterday to one of my boards.
  • schillschill Posts: 741
    edited 2011-02-04 11:27
    Duane Degn wrote: »
    I often solder wire to the bottom of the jack on Propeller Proto Boards. I've also seen other do the same. In fact, I did this yesterday to one of my boards.

    I missed that when I looked at the copper in the manual. It looks like there is a pad on the bottom with a via connecting to the Vin pad on the top. So the wires can be soldered to the bottom of the board.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2011-02-04 13:41
    It looks like you could also solder a wire to the anode of the diode on top of the C3 board.
  • AndreLAndreL Posts: 1,004
    edited 2011-02-04 16:47
    Does anyone read my manuals :) Those are the large bulk capacitor holes for large 2000uF or larger caps if you are loading the C3 with large inductive loads. The idea is that you can put a nice fat elec cap there on the bottom of the board, but we didn't want to put something that large, so I put the holes and explain them in a number of places in the manual including the power supply stuff. Anyway, that said, if you WANT you could plug external power in there 7ish to 12v if you wanted?

    Andre'
  • TrapperBobTrapperBob Posts: 142
    edited 2011-02-04 16:59
    Andre,

    I for one want to thank you for the quality and detail that you have put into your designs and product. I own most if not all of them and wish that all would do as well documenting. Nothing but a class act!!

    TrapperBob
  • AndreLAndreL Posts: 1,004
    edited 2011-02-04 19:33
    Thanks :) I appreciate that. I really do try and bring back the feel of the old Apple ][, Atari 800, C64, or Amiga manuals they were themselves works of art. And classics like De Re Atari. Since I did this for Parallax, I had to control my creative side a bit, but my manuals for Nurve products have interesting pics at the ends of chapters from movies like star trek, war games, whatever is relevant. Also, I always put an ASCII chart and hex table in there :) But, nevertheless, the C3 manual is very complex, if you text search for something usually its there even if you can't find a call out in the Table of Contents, we only printed it 2 deep I think.

    Andre'
  • RavenkallenRavenkallen Posts: 1,057
    edited 2011-02-04 21:43
    Sorry Andre. I probably should have checked there first:).. 7 or 12 volts? I wonder if there is a way to put 5 volts through it(Like USB)?
  • AndreLAndreL Posts: 1,004
    edited 2011-02-04 23:14
    You can do anything you want, but if you want to put 5V in it then you would inject 5V where the USB 5 comes in since its NOT regulated (and assumed to be regulated by the USB) and then used to power the 3.3V. But, I am not sure what you want to do this? Either power it from the USB, or power it from an external 9V. Or you can hot wire it by applying 5V to the output rail 5V, that will power the 5V and then get routed to the 3.3V as well.

    Andre'
  • RavenkallenRavenkallen Posts: 1,057
    edited 2011-02-05 08:56
    Ah, thanks... I wanted to figure out the best way to power it from batteries(LiPo's). I guess i could use a 5 volt Dc-dc converter.
  • AndreLAndreL Posts: 1,004
    edited 2011-02-05 15:41
    Right, bottom line is if you want to put 5V in there, you just want to do it downstream of the 5V regulator, so at the headers themselves, just plug regulated DC 5V in there, and you are good to go. DON'T FORGET GROUND :)

    Andre'
  • RavenkallenRavenkallen Posts: 1,057
    edited 2011-02-05 16:12
    Thank you Andre and everybody else...I will do that
Sign In or Register to comment.