[neonixie-l] Re: [MOD-6_7971] B-7971 Tubes on EBAY in Europe

Except for the clown in the Washington DC area that has been posting the bad tubes for the last 9 months...  Sorry I didn't see the tubes at $50 each.  Sweet deal!  Regards,  Jeff Walton  jwalton.mn@gmail.comSent via the Samsung Galaxy S8+ Original message From: Nicholas Stock

[neonixie-l] Re: MMBTA92 & MMBTA42 anode switching circuit problem

I didn't look at your waveforms (or schematics), but if your switching speeds are very fast, this can cause transistors to turn on when they should not. The inter-element capacitance can pull the control element to the active state, even if it's not reflected on the pin itself. Terry On

[neonixie-l] Re: MMBTA92 & MMBTA42 anode switching circuit problem

I'll be able to check it in few days. Power supply won't be overloaded for sure, it's a 0-300V 1A lab power supply :) W dniu środa, 17 stycznia 2018 22:03:24 UTC+1 użytkownik gregebert napisał: > > Can you check the signals on all 4 of the NPN bases at the same time? > Neglecting blanking, they

[neonixie-l] Re: MMBTA92 & MMBTA42 anode switching circuit problem

Can you check the signals on all 4 of the NPN bases at the same time? Neglecting blanking, they should look like 4 pulses, each 25% duty-cycle, with no overlap. The 4th picture looks like this sequence: - Anode 1 on - Anode 1 & Anode 2 both on - Anodes 1,2, and 3 on - Anodes 1,2,3,

[neonixie-l] Re: MMBTA92 & MMBTA42 anode switching circuit problem

For some reason pasting photographs in google groups doesn't work as I would wish it to. So enjoy the two extra copies of photos at the top, which I didn't see, as I was trying to paste something at the point I was writing at that moment. -- You received this message because you are

[neonixie-l] MMBTA92 & MMBTA42 anode switching circuit problem