On Saturday, March 23, 2013 10:02:51 AM UTC-5, jrehwin wrote: > > > Initial debug turned up a dumb assembly mistake..– I swapped U1 & U2 > despite the clear labels on the silkscreen. > > Silkscreen? That looks like a protoboard. I'm unsure what U1 and U2 are > anyway, most of those supplies only use one IC (the 555). >
I was refering to the base board; not the prototype breadboard which has the 555 timer on it.. > > > I was able to empirically calculate the Anode resistor using the > built-in test point and pot. 21.4k... now I just need to find some 22k 603 > resistors to make it work. 21.4k gives me 2.5mA of anode current which is > typical for the NH-12A tubes I’m using. > > Make sure those SMD resistors can withstand the voltage - you may need to > use two in series if not. > Gave it zero thought. Will verify. > > > I decided early on that I wanted the backlite to be purple rather than > some other color because I thought it’d contrast nicely against the orange > digits. > > And it does - any any mercury haze is effectively rendered invisible. > :D nice accident there, huh? > > With the resistor calculated; I need to focus on creating a Display > tester so I can run the display thru all the digits and functions. > > This is where something like an Arduino comes in handy, as you can just > use it as an easy-to-program logic level generator and have it cycle > through any patterns and sequences you like with not much effort.. > Good Call. Initially I dismissed it because I had an “activewire” microcontroller board here which was collecting dust. Turns out the activewire board only has drivers for WinXP... none for Win7. While at Frys today; I saw they had some Arduino usb devices for fairly cheap. I ended up getting a Nano which had 14DIO pins – barely enough to drive the display. A few hours later; I had a working Pinball Display tester: http://youtu.be/kz3ikA82iH8 I’ll publish the code later; but thought you’d guys want to see the display functional asap. Tests all the digits and the BLANK functionality which is between the 9 and the 0. Next step is to desolder the current display PCB and build a fully populated display based on the latest PCBs. Once I have a fully populated display; I can test all the digits and the 7digit emulation capability. -- 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/msg/neonixie-l/-/miQ8Y2cLSHoJ. For more options, visit https://groups.google.com/groups/opt_out.
