I've been pondering it. Looking at the resistors for lamp one... R1 goes through a 220k to the bus which feeds the transistor oscillator. Each resistor from each lamp circuit is the same to this bus. R2 acts in conjunction with R1 as a voltage divider between the oscillator bus and the ground bus for the lamps. R3 comes from the power bus. R1/R2, the lamp and R3 are in series.
In the enclosed drawing of a previous counting circuit I've built with success I found that if the resistor values were equal the circuit would count in an orderly sequence of one through five and repeat. If those values were changed with pots, it would alter the timing and the sequence of firing. Removing some feeds caused those legs in the counter to skip. I've noticed a pattern to the resistor values of R2/R3, R5/R6, etc. L1 hi/lo - L2 lo/hi - L3 hi/lo - L4 lo/hi - L5 hi/lo - L6 lo/hi. A variety of values but the relationship remains the same with either a group of high values or low values. The total series/parallel values of R1/R2-lamp-R3 are not equal. The caps are not sequential from L1 thru L6, but scatter to the lamps in 3, 4 or 5 bus spreads. The caps are all equal value. >From previous experience either of these changes (R or C with one remaining constant) would cause a counting circuit to randomize, or at the very least not count sequentially with equal length firings. Altering the cap sequence changes the firing order as well. Since I used 0.22 caps instead of 0.25's as the schematic indicated, it is possible that even with exact resistor values as indicated it might not oscillate. So my current plan is to hook up trimmers. A "low" version (1meg pot with 100k in series) with a range of 100k to 1.1meg, and a "high" version (1meg pot with 1meg in series, and a spst switch with 1meg on the legs) for a 1meg to 3meg range. At least thats my plan tonight. Now to think on it some more. -- 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/CAPsrQ%2BFp3qYsbXSSaYE2Vum2Eq31h93Qp9EoZsfz-z4s7N44qA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
