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Determined pinoutįor demonstration purposes I reverse-engineered the two aforementioned VFD’s pinouts. Single segment glowing on Futaba 9-BT-22ZK. Some resistors in range 33 - 100 kΩ, I used 51 kΩ.Power supply which gives voltage 24 - 50 V, not necessarily variable.Power supply for the filament - 3 - 5 V, as determined in previous step.I assumed that both of them can be safely powered from 3 V power supply. Majority VFD filaments start to glow at the voltage between 3 - 5 V.
![futaba vfd calculator futaba vfd calculator](https://slomkowski.eu/tutorials/determining-the-pinout-of-the-unknown-vacuum-fluorescent-display/nec-segments-glowing.jpg)
Wait couple of seconds after each increase. You should gradually increase the voltage by 0.1 V starting from 2 V. Connect it to the filament and observe it in the dark room. It’s widely assumed that the safe voltage for powering filament is when the filament just barely starts to glow dark red.įor testing you should use variable voltage power supply. The cold filament is supposed to have resistance of several ohms, my displays: Majority of them have easily determinable filament pins just by looking through the glass.ĭouble check this using the ohmmeter. Within the display is no more and the VFD is irreversibly broken. Of the VFD, you’re supposed to notice dark and shiny getter spot. The first thing to to is check whether the display is airtight. NEC FIP4B9F - 22 pins, salvaged from microwave oven.įutaba BT-22ZK vacuum fluorescent display.Futaba 9-BT-22ZK - 23 pins, salvaged from an old videotape recorder,.Examinationįor the purpose of this article I have examined two vacuum fluorescent displays: Usually devices containing the vacuum fluorescent displays have accompanying power transformers Leftmost digit has anode-cathode voltage of 30 V but rightmost - 25 V. Your anode voltage is 30 V and filament 5 V, ground connected to left pin. Of the filament will cause changing effective anode-cathode voltage for every digit. If you provideīoth anode and filament voltages from the same power supply, the voltage drop along the length Transformer with the center tap connected to the ground. Vacuum fluorescent display filament should be powered by alternate current from center tapped Some folks even made audio amplifiers using them!
#Futaba vfd calculator driver#
VFDs have advantage over nixie tubes that they don’t need separate driver for every digit. Shorting the grid to the cathode shuts the whole digit down. To light the segment up, you have to supply voltage in range 30 - 50 V to both anode and the grid.
![futaba vfd calculator futaba vfd calculator](http://1.bp.blogspot.com/-YzZOjHn423E/VPF0pJMAziI/AAAAAAAADHg/B4FWTVqzjRs/s1600/Sharp_EL-8118_025.jpg)
They are not as iconic as Nixie, but they do nicely as retro display. Everything I know about Vittorazi Easy/Evo 100 paramotorĭetermining the pinout of the unknown vacuum fluorescent display.Extracting security codes from car radios.Eavesdropping USB communication and writing driver in Python.Determining the pinout of the unknown vacuum fluorescent display.
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