Electronics > Projects, Designs, and Technical Stuff
NEC LD8121 VFD Tube pinout
c4757p:
Quick update before you get started: I just realized I recommended starting with 5V on the filament. No!!! There are a good few (especially older) VFDs that take about 2-2.5V - you'll pop it with 5. Start around 2V, 12V on the anodes, and if it doesn't work satisfactorily, increase the heater voltage gently and keep an eye on the filaments - go up until they just start to glow a tiny bit, then back off the voltage a hair so that they're just about to glow.
If they are indeed equivalent to IV-27, this website claims 5.15V at 160mA.
sergey:
Hah good to know this before doing experiments :)
Harvs:
If you haven't seen it, you may find something useful in the schematics I posted a little while back.
https://www.eevblog.com/forum/projects/'jelly-bean'-vfd-driver/
sergey:
--- Quote from: Harvs on October 09, 2013, 11:32:17 pm ---If you haven't seen it, you may find something useful in the schematics I posted a little while back.
https://www.eevblog.com/forum/projects/'jelly-bean'-vfd-driver/
--- End quote ---
Indeed didn't see it yet. And schematics seems really useful for the young VFD players like me. Thanks :)
sergey:
Just quick update.
Unfortunately, was stuck with real job for quite a while and then my DC supply decided to go kapuuut. Fixing it now and hope to come with pinouts soon :)
Sorry if someone was interested in such a schematic..
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