VGA Breakout Adapter w/resistor color fix

Comments

• Phil Pilgrim (PhiPi) Posts: 23,514

  2012-07-31 19:47 edited 2012-07-31 19:47

  There's a layer missing from the image. Can you post a schematic, too, please? 'Wanna check those resistors!
  
  -Phil
• Oldbitcollector (Jeff) Posts: 8,091

  2012-07-31 19:53 edited 2012-07-31 19:53

  I pretty much drew this from scratch in the PCB editor (it's the same layout at the new VGA+ boards)
  
  Here's the circuit I'm using...
  
  

  

  

  

  VGA_BREAKOUT_SCM.jpg

  440 x 343 - 23K

  VGA_BREAKOUT_SCM.jpg 23.3K
• Phil Pilgrim (PhiPi) Posts: 23,514

  2012-07-31 20:39 edited 2012-07-31 20:39

  Jeff,
  
  A better set of values would be 240 and 510 for the DAC series resistors, and 130 to ground. This accounts for the Prop's internal 27-ohm resistance. But try it first and measure the output on a scope to make sure it peaks at 0.7V with a 75-ohm load
  
  -Phil