Hi Guys,
I found some more info about an older style nixie tube batch counter, unfortunately nothing about the even older dekatron counter.
However, this one is quite interesting as it is an all transistor counter and some of you might want to have a look how that was done before the IC era.
I found some more info about an older style nixie tube batch counter, unfortunately nothing about the even older dekatron counter.
However, this one is quite interesting as it is an all transistor counter and some of you might want to have a look how that was done before the IC era.
Circuit block diagram. Texts are in German but the circuit is easy to understand.
http://xiac.com/download/KingBatchCounter.pdf
http://xiac.com/download/KingBatchCounter.pdf
To work out how it actually does the job, I simulated this design some time ago in Multisim. It was very interesting to see how exactly the BCD counter and Nixie decoder work together by only using the minimum amount of transistors.
http://xiac.com/Images/CounterCircuit.JPG
http://xiac.com/Images/CounterCircuit.JPG
And here the DIV2FFN sub circuit. It is one of the most amazing circuits I have come across. Just 2 transistors to make an element that is a pre-settable SR latch with edge triggered clock input that also functions as a divider by 2 circuit. Yes, all that with 2 transistors and a couple of resistors and diodes. just try to figure out for yourself how it actually works.
http://xiac.com/Images/DIV2FFNblock.JPG
http://xiac.com/Images/DIV2FFNblock.JPG
It actually counts the sequence 0 - 1 - 2 - 3 - 4 - b - c - d - e - f. I guess it saved a few components rather than counting pure BCD from 0 to 9.
I think all the links will work, if not, just let me know.
Cheers,
Michel
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