--- In NEONIXIE-L@..., "mimewar" <mimewar@...> wrote:
I am using a Stamp to drive the binary pins on a 74141, I have the
74141 powered with +5V, and ground. I know my code is good (tested
with LEDs, all checks out, the binary adds up and is timed perfectly.
Something is not working. I have the HV coming from a Tayloredge
HVPS, with a 15k on the anode. I have tried four different 74141
(both American, and Russian) Nada. I watched long enough, and the 6
will light up, but nothing else. It lights when it is supposed to,
in sequence, but nothing else. I have tried four tubes as well.
the notch at the top of the 74141 is between pins ONE, and SIXTEEN
right? What am I missing here?
Can't tell from your description. I had an idea, but since you said you had it working with LEDs (I assume driving the LEDs with the 74141?), my idea couldn't be right.
On the other hand, if you were only driving the LEDs with the BCD signals, and not the 1-of-10 outputs, maybe I was right in the first place. You know that tube and IC pins are numbered in the same way, but described as viewed from opposite sides, right? I.E., tubes are drawn as viewed from the bottom, with the pin numbers going clockwise, while ICs are drawn as viewed from the top, with pin numbers going counterclockwise. This works out to be exactly the same, only the point of view makes the directionality seem to change, but it really doesn't.
If this is not the source of your problem, we'll need something more, like a schematic or some clear photos of your circuit.
A.J.
