On Apr 18, 2015, at 4:06 AM, Chaos Hydra <[email protected]> wrote:
> Hello! First time post here. So I am doing a nixie clock with IN-12 and > KM155ID1 mux chip. The KM155ID1 is a nixie driver, not really a "mux chip", although it can certainly be used in multiplex designs. > To ensure the look, I decided to use INS-1 neon bulb to do the little colons > between the digits. My questions is: can I drive the INS-1 bulb as I did to > IN-12? With an 220k current limiting resistor under 170VDC, the INS bulb got > 5mA. Considering IN-12 has 6mA without current limiting resistor, I think I > can just use K155ID1 to sink in the current and control the neon bulbs. Yes, the chip won't mind at all. However, due to the clamp diodes, the "off" voltage is about 100V (60V for the US equivalent). With an ordinary nixie this is fine as long as another cathode is lit. However, for individual bulbs and nixies without any cathodes lit, that's enough voltage across the tube to possibly cause some unwanted glow. > Consider I give most of my knowledge of digital parts' parameter back to > professors, can any one please point out on the data sheet: when I am sinking > current into the active low pin(to turn on an bulb or a single filament in > nixie), which value is the maximum current? That does not appear to be given on the data sheet, however, it does say that when sinking 7mA, the voltage on an output pin will not exceed 2.5V, so 7mA is allowed by implication. - 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 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/EE13A798-5D76-4A37-8789-BF10453FC055%40mac.com. For more options, visit https://groups.google.com/d/optout.
