Hi Luka what do you mean by "supply gets very hot", does that mean the MOSFET get very hot, or the input 12V supply?
Looking at that design, I would imagine that the reason it has "DO NOT USE" on it is because the MOSFET is turned off by the 330 Ohm resistor when the output transistor is turned off, and that does not give a very clean turn off for the MOSFET. If this is the case, you not get a very good inductive spike. Also I notice that the current sense pin isn't doing anything, so I imagine you're going to run into problems with efficiency and heat. I think you need a better HV supply. But if you want to persist with the one you have, try heat sinking the MOSFET, or if you don't have a heatsink, pee on it every couple of minutes to keep it cool... (I'm joking) Are you sure that is your HV power supply? It seems strange to use a design that even the designer has canned.... On Monday, 21 September 2015 15:11:27 UTC+2, Luka C wrote: > > Hi everyone, > > I need help with my newly built clock. The thing is, after I turn it on > and the clock runs for like 5-10mins, some of the digits on tubes become > partially lit like on the picture. Now, I noticed the power supply gets > very hot after running for 5-10mins and I measured the voltage on +HV > (+185V) pin of the power supply while the clock is running. It seems like > the voltage keeps dropping as the supply gets hotter (last time I measure > it, it went down to 148V and these artifacts became showing on the tubes. > The digit usually lights up normally at first, then after the cathode > poisoning routing it becomes partially lit like on the first picture, then > after the second cathode poisoning routine, it gets partially lit like on > the second picture and so on, it shows on all of the tubes at some times. > I'm using 27k anode resistors on IN-14 tubes and I guess the power supply > is of the design from the picture I attached. > > Thanks in advance! > > <https://threeneurons.files.wordpress.com/2011/08/mc34063_m1bad_b.gif> > > Power supply design (I suppose) > > > > <https://lh3.googleusercontent.com/-tWX7o41vLGo/VgABPh-hTCI/AAAAAAAAAEg/rmwkNiodFxw/s1600/IMG_20150920_030556%255B1%255D.jpg> > > > > <https://lh3.googleusercontent.com/-4_1qUwrCX7k/VgABgjPr3OI/AAAAAAAAAEo/nE9UobiBRoY/s1600/IMG_20150920_030543%255B1%255D.jpg> > > > > > -- 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/4faa25fb-9653-4ef0-9847-82e1c57c40b8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
