Two arduinos one has an ethernet shield and gets the state of each led from a website.
The other acts as a display controller refreshing the screen and geting the state of each led from the other arduino.
The actual screen is 64x64 leds. Each led is a standar 5mm 20mA variant. The actual refresh rate does not matter
but it must not seem to flicker or turn off-on while the arduino updates the screen from the other arduino.
The reason why i put the capacitor-resistor-diode is so that each led can remain on even after i have refreshed the screen.
Additionaly without the capacitor each led would output about 1/64th of the nominal light. With the capacitor i can get them to full brightness.
It would take about 8.2ms just to put the data to the column shift registers plus the time i need to get that data from the other arduino
(an other 8.2ms at best) which kinda limits my refresh rate.
fungus:
Or different MOSFETs. Get some that are designed for switching at 5V logic levels.
Do you have any particular in mind? All i find have 500-1600pF at 5Vgs. Gate capacitance is proportional to the current capability of the mosfet.