I've never tried it, but h-bridge drive seems reasonable. It will result in an average of zero volts along the filament while warming it at a fixed power.
On Tue, Jan 13, 2026 at 9:28 PM Per Jensen <[email protected]> wrote: > I wonder how the filament is driven as I see no transformer but two > inductors - Did anyone look into how these Noritake displays works > power-wise? > > // Per. > > On 13 Jan 2026, at 12.49, Tom Katt <[email protected]> wrote: > > Since the POS displays seem to be all bought out, I figured that I'd post > some photos of the Noritake CU24043-Y100 > <https://www.noritake-elec.com/products/model?part=CU24043-Y100> display > that I also purchased on eBay <https://www.ebay.com/itm/326162809973> for > $40 (no relationship with seller)... This is a smaller 20 x 4 char display > that has many built-in features including automatically expanding the chars > x2 in vertical, horizontal or both axis. Easily driven by 3 pin RS232 > serial (+5V, GND, TXD), but I think it's RS232 and not TTL serial - so > either use a MAX232 module or you can set FTDI adapters to invert TXD > <https://www.ftdichip.com/Support/Knowledgebase/index.html?ft232rdeviceoptions.htm>. > The software demonstrator makes it easy to figure out the serial escape > commands needed to enable the various functions. It's smaller than the POS > display (about 3" wide x 1.2" tall) but still very legible, especially with > the large font options. Just figured I'd toss this out there in case > anyone was interested... > > <VFD_1.jpg> > > <VFD_2.jpg> > > -- > 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/2b9b4ffd-b68c-4ac2-ba22-1302b6367351n%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/2b9b4ffd-b68c-4ac2-ba22-1302b6367351n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > <VFD_1.jpg><VFD_2.jpg> > > > -- > 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/CE3D12F8-5733-492A-8F9F-99BAE2097F7F%40gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CE3D12F8-5733-492A-8F9F-99BAE2097F7F%40gmail.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/CALiMYru96QkKEA%3Dk8uVhS5SHyb3BhHzwnPjJiS6RCYOtGzv71Q%40mail.gmail.com.
