> > I'm having trouble getting this to work. Everything appears to be good up to > the gate of the NDP6020P, then it is not switching.That scope image is > QuickPrint2.png. The other image is at the drain. The reason for this circuit > is that the HK16K33 can't supply enough current to drive large displays, and > they run on a higher voltage. I want to stay with that chip. Help is > appreciated. Thanks in advance.
It's a really nice chip, I use it too. I'm unclear what the scope photographs are, but I'm seeing what looks like an RC time constant, which may well be the 1k resistor charging the gate capacitance of the NDP6020. I'd suggest using a gate driver chip instead of the 74HC04 and 2N7000. A TSC426 or 472 (depending on whether you want the signal inverted) or similar should do the job. These chips can supply 2A of gate charging current, so they switch quickly. - John -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/E09DC85F-67A1-4457-A47B-799721E396BA%40mac.com.
