PC Engine CSYNC
Re: PC Engine CSYNC
So I could add a 75 or 150R to the csync line (does before or after the cap make any difference?) but my Vpp is already on the low side, and imagine this would lower it even further. Maybe that's not an issue as long as the OSSC doesn't drop the sync.
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NewSchoolBoxer
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Re: PC Engine CSYNC
In a series part of a circuit, which this is, the passive components can be placed in any order and the output is the same. From what you're feeding CSYNC to, it doesn't matter.jsteel wrote:So I could add a 75 or 150R to the csync line (does before or after the cap make any difference?) but my Vpp is already on the low side, and imagine this would lower it even further. Maybe that's not an issue as long as the OSSC doesn't drop the sync.
However, you may have to consider the voltage level and heat dissipation. If capacitor is 5V limit and you're feeding it 4V (I know you aren't) then it'll work fine but 80% of the limit is kind of high and maybe capacitor lasts 10 years instead of 20 if you placed the resistor first. On the other hand, if resistor is only 1/8 watt, maybe you have to place the capacitor first to keep the resistor from burning.
If order doesn't matter, may as well place resistor first to reduce the ripple voltage to the capacitor. A bad power supply could stress it. If you already placed the capacitor first, it's fine. You got bigger problems if the video chip is powered with excessive voltage rippling.