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Stupid electronic question for video connection? — Parallax Forums

Stupid electronic question for video connection?

JohnGayJohnGay Posts: 57
edited 2012-02-27 17:34 in Propeller 1
My basic electronics is a bit rusty, but...
I've got a stack of 560 ohm resistors and I want to wire up the video output on my new Quickstart board. I know that two 560's in parallel will give me 280 ohms and two in series will give me 1.12k, but can I put the 560 pin in the middle of the two resistors in series And the 1.1k pin at the end? This would save one resistor, but seems like a neat approach.

Comments

  • tonyp12tonyp12 Posts: 1,951
    edited 2012-02-27 16:52
    If you only have 560ohms res, you gone need 5.
    The broadcast pin you don't need to use.
  • JohnGayJohnGay Posts: 57
    edited 2012-02-27 17:02
    I'm thinking something like this:
    -560-
    14->/-560\--
    12->-560---560--->RCA
    /
    13-/

    I.E. pin 14 connected to 560's in parallel
    Pin 12 to 560's in series and pin 13 in between the 560's in series?
    Looks like it should work to me, but It's been decades since I did basic DC theory.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2012-02-27 17:28
    That won't work. It would be as if the resistor on pin 12 did not exist. You need a separate resistor for pin 13.

    -Phil
  • tonyp12tonyp12 Posts: 1,951
    edited 2012-02-27 17:29
    Pin12 would have it's series resistor to the 75ohm load altered depending if pin13 is Vdd or Vss state, so should not work.
  • JohnGayJohnGay Posts: 57
    edited 2012-02-27 17:34
    OK, thanks. Told you I was rusty.
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