Why would you say something like that? What's wrong with using trimpots instead of resistors when you're not home with your stuff? Or using NPN based anode drivers.. Why would I NEED to make a so popular NPN-PNP anode driver, when I first thought of something like this, with parts I already had. And it all seems to work. And sorry, no I haven't heard that one. Nothing like that in my language.
On Mar 22, 7:45 pm, Adam Jacobs <[email protected]> wrote: > I'm starting to get the impression that this is a parts-box project. > Have you ever heard the expression that when the only tool you have is a > hammer, everything starts looking like a nail? > > On 3/22/2012 11:42 AM, Imbanon wrote: > > > > > > > > > Please take note that I am not using PNP's at all, only NPN's :) > > > On Mar 22, 7:12 pm, Adam Jacobs<[email protected]> wrote: > >> _MUCH_ better. > > >> Okay, firstly this design can work - there's nothing fundamentally wrong > >> with it. Like I said, you'll need to be able to make cathode-side > >> blanking (74141) work if you're going to stick with only 3 anode drivers. > > >> 1) Your anode drivers aren't quite right. The resistor on the base of > >> the NPN should be more like 10k (R1). You're missing the pulldown on the > >> base as well. Add a 10k between the base of the NPN and GND. The > >> resistor between the collector of the NPN and the base of the PNP should > >> be more like 1M. The resistor between the base of the PNP and the > >> collector of the PNP should be more like 10k. > > >> 2) The reason that you are getting current leakage with the 74141 is > >> because your HV supply is too high. Instead of 215v, use 180v. > > >> -Adam > > >> On 3/22/2012 11:00 AM, Imbanon wrote: > > >>> Sorry about that. I thought it was an universal shematic file type, > >>> 'cause they are all .sch > >>> Here's the pic http://www.mediafire.com/download.php?5903q1ur3inc729 > >>> Cheers > >>> On Mar 22, 4:14 pm, Adam Jacobs<[email protected]> wrote: > >>>> Would you mind converting that schematic to some kind of image file? Is > >>>> that an eaglecad file? > >>>> blanking on the 74141 will cause leakage if the supply voltage is too > >>>> high. Are you using real 74141's or the russian kind? > >>>> From that picture, I'm not sure if that is leakage. > >>>> -Adam > >>>> On 3/22/2012 5:19 AM, Imbanon wrote: > >>>>> Hey all > >>>>> I found some time to make a schematic. It only shows the two 74141, > >>>>> nixie tubes and anode drivers. > >>>>> I also tried blanking nixies via 74141. I would have never guessed > >>>>> that you meant on hex code, as I am doing this on an arduino :) > >>>>> Blanking nixies with 74141's give me a lot of leaking (or at least I > >>>>> think thats leaking), so I'm not so sure about using this method. But > >>>>> I do think that it's maybe possible to divide the leaking to the rest > >>>>> of the nixies by adding a resistor for each anode, instead of sharing > >>>>> them. See for yourself in the links. > >>>>>http://www.mediafire.com/download.php?bbx4z4k5vjul56b > >>>>>http://www.mediafire.com/download.php?ym4s96yeusrm9sy > >>>>> So I guess my next move should be to remove the trimpots, and replace > >>>>> them with actual resistors for each anode. > >>>>> But what should I do with the blanking? To be honest, I would leave > >>>>> the setup as is, because it seems to work fine. But if you guys think > >>>>> I can do something better to get a longer tube life, I will make > >>>>> changes to the schematic immediately. > >>>>> Thanks! > >>>>> On Mar 19, 12:04 am, Dylan Distasio<[email protected]> wrote: > >>>>>> I'm very interested in hearing more about this module...Are you saying > >>>>>> you > >>>>>> are having this custom manufactured? If so, how have you found a way > >>>>>> to do > >>>>>> this economically? > >>>>>> On Sun, Mar 18, 2012 at 6:31 PM, Cobra007<[email protected]> wrote: > >>>>>>> For my clock I am designing a module as I am not really a fan to use > >>>>>>> these types of old TTL logic. It's a 24 pin module that fits into a > >>>>>>> DIP24 IC socket. It basically mimics the 74141 but has high voltage > >>>>>>> output mosfets (240V) and the 4 inputs can be latched, so you don't > >>>>>>> need extra latches as required by the standard 74141. It also offers a > >>>>>>> blanking input, either by writing 0x0a or using a dedicated pin (which > >>>>>>> is convenient for PWM dimming). It can be interfaced with MCU or > >>>>>>> arduino. > >>>>>>> Michel -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
