Maybe I should explain my design. For now, I have the following boards:
Power supply board, delivers 5V and 170V ATmega controller board with connections to drivers, RGB leds, PIR and GPS/NTP Two types of driver boards, one using 74XXX and transistors and the other using HV chips Four types of “display” boards, IN-8, IN-12, IN-18 and Z5660M, all of them with the MOSFETSs and RGB leds I like the idea of a modular system. If I want to switch from an ATmega to an ESP32 or a Raspi I just have to change the controller board. Or if someday I want to make a 12-digit clock I just can cascade two driver boards. Even if the clock has a nonstandard design I can use the drivers with direct wiring to the nixies. Well, that’s why I have separate boards. Back to the 2n7000 problem… In my case, the MOSFETs only die if the gates are not connected to the controller. When I started to test the display boards, I killed all the MOSFETs on all the boards because I tested without the RGB connection. The grounds are connected and the power supply is the same for all boards. Adding the 1M resistor and the diode near the MOSFETs, stops the massacre :-) I don’t know why the diode helps but that works for me. But as Jon pointed out, with my design it’s probably better to switch to transistors. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/4835b6f7-10d3-4034-88d2-ea79698be57a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
