> > A last movei before bedtime: http://www.youtube.com/watch?v=owPnu6B-xHg I > used the GSA10G to drive a GR10J large Nixie at just 2mA anode current for > the Nixie as that is the limit in the datasheet for the GSA10G. All figures > lit up beautifully at 2mA anode current but by adjusting each cathode with > a small resistor the current could be controlled better so that each figure > get exactly 2mA, now the average was 2mA but some figures consumed a lot > less, close to 1.5mA which made them glow less than others. The GSA10G was > made with the GR10K & GR10H in mind which erquire up to 2mA anode current > whereas the GR10J is made for up to 4mA anode current. I had to raise the > voltage to 500V on the GSA10G to make sure that it could provide enough > current and the correct voltage level for the GR10J to light up, at 475V > thew figures were not fully covered with glow even though I decreased the > anode resistor for the GR10J, the bias network for the cathodes (auxilliary > anodes) could possibly have been adjusted too get the same effect. > > I am very pleased the GSA10G works with the GR10J as I can use them in my > clock even though adding an extra current limiting resistor for each > cathode will make it trickier to wire it up and quite possibly also tricker > to adjust the glow on each figure. > > I also tested the speed of the GSA10G with the GR10K and by raising the > guide pulse voltage and guide bias voltage I could get it to count up to > 8KHz, a bit faster than the specified 5KHz but I might have gotten a bit > outside of the specifications of the voltage limits for the pulse and bias > voltages on the guides. I had to raise the pulse voltage to 225V(normally > 110V-150V) and the bias voltage to 100V (normally 60+/-5V). > > Finally something is going my way! Now I'll just have to learn to use the > cold cathode trigger tubes for the coupling stages and reset stages for the > GSA10G so I can make the stages for seconds, minutes and hours. Making > these stages with transistors is no problem but it will be my first try > with cold cathode trigger tubes for those stages. > > /Martin > >
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