Hi All, I've spotted an error in my schematic! Resistor R5 should NOT be connected to the junction of C2, D1 & R9 but instead to the junction of R9,R10 & R14. Sorry for this mistake, I hope that no one has had problems getting their A-201 Polyatrons up and running due to this error. /Martin
Den söndagen den 24:e mars 2013 kl. 22:32:10 UTC+1 skrev Dekatron42: > Hi All, > > Now I have made simple design that will take a carry signal from any of > the Nixie cathodes and then make a pulse long enough for the set/reset > stage. > > There are a few added voltages to this design, one +250V for the set/reset > signal and one +60V used as a bias for the otherwise negative pulse taken > from the Nixie cathode. There is also a diode at this carry signal shorting > any positive pulse to ground, the positive pulse from the set/reset stage > will otherwise be present on the carry signal if you put the reset/set > signal to the same cathode as where the carry signal is taken, possibly > destroying the transistor there. > > I am sure that there are otherways of solving this that might be smarter > in many ways, but this is one that works. The circuit is not perfect either > as it loads the A-201 Polyatron so that the counting speed will be lowered > due to the capacitive and resistive load from the set/reset and carry loads. > > The reset signal has a minimum length for the circuit to work properly, > there are different values stated in different datasheets, ranging from > 170uS up to 300uS - this limits the counting speed a lot so high speed > division with anything except 10 has a frequency limit of somewhere around > 2KHz. > > You can also see that I have been experimenting how the 22nF capacitors > and the 100K resistors on the auxilliary anodes of the A-201 Polyatron > should be connected. Now I have the capacitors to the Nixie anode voltage > and the resistors are just connected together on one side. The reason for > this is that it works a lot better with the set/reste and carry stages > loading the circuit. > > There is still a lot to experiment with for me (and anyone who wasts to > use these A-201 Polyatrons in a clock or something similar) regarding guide > bias voltages and also which voltages the cathode and screen > electrode should have for it to work perfectly. > > I made three short movies of the circuit in action: > > http://www.youtube.com/watch?v=NYhHrQ1fwRA - counting 9, 0, 1, 2, 3 in a > loop > > http://www.youtube.com/watch?v=UoeDvLKGq00 - counting 2, 3, 4, 5, 6 in a > loop > > http://www.youtube.com/watch?v=bGUwAzvNxQs - counting 1, 2, 3 in a loop > > I've also found a bunch of Russian books on Dekatrons, Nixies, VFD's, > LCDs, Cold Cathode tubes (trigger tubes) and other interresting stuff > relating to counting. I have no webpage nor any FTP to make these available > for download but if someone has I can upload them there for anyone to > download. I have given these books to some people on the group but not > asked if they can host them yet (will do that after this message is > finished!). > > Enjoy! > > /Martin > -- 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/msg/neonixie-l/-/5o6GsqpePzMJ. For more options, visit https://groups.google.com/groups/opt_out.
