I actually want to drive 2 IN-9s and 2 IN-13s. I hadn't realised IN-9s took so much current so I might change that to 4 IN-13s. I've ordered one of Max's supplies to experiment with but some of those modules would save me some work too.
I want to make an animated version of the BoP helmet, with the bars above her forehead replaced by VU-meter tubes. https://www.ministryofpinball.com/en/catalog/product/view/id/6206/s/the-machine-bride-of-pinbot-flyer/category/101/ On Thu, Nov 21, 2024 at 3:36 AM Richard Scales <[email protected]> wrote: > That's really neat. > > I have had a project like this planned for several years but have not got > round to doing anything much about it. > > Are you willing to share your schematic and code? > > I really want to build a 20 channel device to be both a spectrum analyser > and to perform various graphic display routines. > > I had planned to use a Teensy running with their FFT library - what are > you using? > > - Richard > > > On Thursday, 21 November 2024 at 03:28:43 UTC Zachary wrote: > >> [image: IMG_20240820_221627_635.jpg][image: IMG_20240820_221627_609.jpg] >> >> So it's these little 21x24mm module I designed based on the common driver >> circuit for IN-13s I could find online (it should also work with IN-9s but >> I don't have any) with an I2C DAC. It fits on a breadboard and multiple can >> be chained in series with U-shaped headers >> https://www.mouser.ca/ProductDetail/640-BG305-06A0500LD. The space >> between tubes on chained modules is about 12mm. >> >> The transistor I'm using is a MJD340, the op amp is a MCP6001 and the DAC >> is a MCP4706. Not all designs I found online included a potentiometer but >> I'm glad I put one since the tubes I got on eBay varied wildly in glow >> length at the same resistance. >> >> Initially I 3D printed some little clamp holders to hold the tube in >> place above the board (the notch is to help align the clamp as I planned on >> gluing it directly on the PCB instead of using screws) but I couldn't get >> multiple tubes in a row to stand perfectly straight so I scrapped that. >> After a lot of trial and error I discovered that by far the best way to get >> a straight row is simply to use good old tie-wraps (which you can see in >> the video bellow). >> >> This is only my second PCB (and the first one that actually works) so >> there are some problems I would fix if I were to do a revision. I would put >> the GND pad next to the 150V one instead of the SDA (which I didn't do >> because I couldn't find a way to route it neatly). I would also maybe make >> it smaller as I don't need the empty space on the top (which was to glue >> the clamp holder). But by far the biggest drawback with this is that the >> DAC I'm using has a fixed address. On the datasheet it says that there is 8 >> available, and it wouldn't be a problem if that was actually the case (as I >> am making an 8 tube spectrum analyzer), but in reality all electronic >> suppliers I checked only stock the first four ones :( >> >> https://youtube.com/shorts/-yOVEOMO8Xs >> >> It is not that big of a problem however, I will just use 2 buses with a >> software I2C Arduino Library. Below is a 3D render of the enclosure I plan >> on maybe building for it if I have the time and if its actually makeable >> (not sure yet). >> >> [image: Untitled_2024-Jun-30_01-06-50AM-000_CustomizedView4724087096.png] >> On Wednesday, November 20, 2024 at 7:11:52 PM UTC-5 Mac Doktor wrote: >> >>> >>> On Nov 20, 2024, at 6:14 PM, Zachary <[email protected]> wrote: >>> >>> I am using a NCH6300HV to power my chainable modules. >>> >>> >>> Tell us more about these modules... 8D >>> >>> >>> Terry Bowman, KA4HJH >>> "The Mac Doctor" >>> >>> https://www.astarcloseup.com >>> >>> “...the book said something astonishing, a very big thought. The stars, >>> it said, were suns but very far away. The Sun was a star but close >>> up.”—Carl Sagan, "The Backbone Of Night", *Cosmos*, 1980 >>> >>> >>> -- > 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 view this discussion, visit > https://groups.google.com/d/msgid/neonixie-l/0742a954-c41e-4ba8-bbd2-57fffcc900ebn%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/0742a954-c41e-4ba8-bbd2-57fffcc900ebn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/CALiMYrtx%2Bu5czo0nyhbyG-Vf%2Bbhchnv%2Bw6%3D2FLF74vr21o6Rnw%40mail.gmail.com.
