Martin
Looks good - I'm envious of your stash of dekatrons but it is so good to
see them being used.
Which trigger tube/circuit are you going to use for the interstage
coupler? In experiments I have reproduced the standard GTE175M and Z700U
stage couplers, but you're using what must have been the last
development step in dekatrons before the transistor took over.
Look forward to seeing more results :)
Grahame
On 21/11/2012 23:37, Dekatron42 wrote:
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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