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Painless
07-02-2009, 11:46 PM
Can someone please confirm for me the correct schematic for attaching a VGA port to the propeller? I note that the demo board schematic shows twin parallel resistors on some pins (470 and 240 ohm), yet the VGA accessory from parallax only comes with 240 ohm resistors.

Could anyone please clear this up or me?

Russ.

parts-man73
07-02-2009, 11:55 PM
Russ,

I assume you mean for the ProtoBoard....
The 470 ohm resistors are already on the board, they are surface mount. They then include the 240 ohm resistors in a through-hole so you can solder them on yourself if adding the VGA connector

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Brian

uController.com (http://uController.com) - home of SpinStudio - the modular Development system for the Propeller

PropNIC (http://uController.com) - Add ethernet ability to your Propeller! PropJoy (http://uController.com) - Plug in a joystick and play some games!

SD card Adapter (http://uController.com) - mass storage for the masses Audio/Video adapter (http://uController.com) add composite video and sound to your Proto Board

parts-man73
07-03-2009, 12:05 AM
The reason they leave some of the resistors out, when soldered in place, the 2 pin pairs would be connected with 710 ohms of resistance. Which is the reason that new users sometimes comment about adjacent LEDs on the demo board being dimly lit. If the 240 ohm resistors aren't soldered in, the 470 ohm resistors on-board are dead-ended.

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Brian

uController.com (http://uController.com) - home of SpinStudio - the modular Development system for the Propeller

PropNIC (http://uController.com) - Add ethernet ability to your Propeller! PropJoy (http://uController.com) - Plug in a joystick and play some games!

SD card Adapter (http://uController.com) - mass storage for the masses Audio/Video adapter (http://uController.com) add composite video and sound to your Proto Board

Painless
07-03-2009, 02:33 AM
Thanks, Brian. That clears that up.

Russ.