qbradq wrote:
Drag, using a small capacitor from Vcc to Ground is a commonly used method of "debouncing" the supply voltage for an IC. The few electronics books I have read suggest doing this.
Keep in mind that a capacitor, especially one of low capacitance, does not create a shunt. I do not exactly understand how it "debounces" the supply voltage, but I know it does not short the circuit.
"Bouncing" refers to mechanical things, like switches and buttons. As in, when you press a button, it's not a clean transition from open to closed, but the button physically "bounces" against the circuit before it rests. Basically, you see something like:
1-------0101010----------1010101------
instead of:
1---------0------------1--------
for when a button is pressed (1->0) and released (0->1).
The PPU doesn't deal with mechanical things like that when rendering video, and unless I'm misunderstanding the OP, he wants to filter the output of the video, which I think is better accomplished by fiddling with the video-out pin, instead of vcc/gnd. So am I right to be confused here? I see how it would be helpful to add a "debouncing" capacitor between vcc and gnd, but I'm having trouble seeing how it would be conductive to video output.