**broken link removed**
The Thyristor is SUPER sensitive. That's why the 15ohm resistor is there, it also pulls the gate low again causing the gate to close. When ever I would hook my VGA cable up to the gates it would open the gate, or when i would any pin power, all 15 thyristors would fire. But would a diode work? So that it had to reach a certain voltage? Or is it the leds causing the sensitive gate? If so I can remove them, I like to keep them, one is to tell me when I have a live firework, the other is a test led for Grinch, and they both barely turn on to tell me that the board has power. I think thats why its sensitive.