1. Vacuum Fluorescent Display Pinout
2. Vacuum Fluorescent Display Drivers
3. Vacuum Fluorescent Display Filament Drivers For Macbook

I'm functioning on producing a clock (ór something) out óf some VFD tubes that I obtained from an old loan calculator. I've figured out how to make a tube work. The filament obtain 1.2v, the grid and segments get 12v. Right now I want to make use of a decoder to drive the segments off of a countertop. I've obtained a few SN74LBeds47 chips that look like they can do the work.

I can amount out how to obtain the inputs, my dilemma will be how to obtain the 12 volts. I've attached a little schematic, the chip will get 5v, then the 12v is definitely from another source and needs to get transformed on to lighting the segment. I believe that would end up being called a draw up resistor, but what value should it end up being? BTW, the guidelines of this task require that all (or many) parts arrive from my containers of ttl potato chips, no micro controllers allowed. Thanks a lot for your assist. This should do it for you: Q1 can become a range of common purpose small-signaI PNP transistors, Iike a 2N3906, 2N4402, etc.

Rload symbolizes one of your sections that needs a +12 supply to illuminate. The 7447 tag will be where you would link one of the section outputs from the SN74LT47.

1. A DIY Vacuum Fluorescent Display Driver June 13, 2013, 8:31 pm In my previous post, I showed a simple vacuum fluorescent display filament driver built using a 555 timer and a custom hand-wound, center-tapped toroidal pulse transformer.
2. And another VFD salvaged long ago, a NEC FIP7FM7 (“FIP” is a trade name for Fluorescent Indicator Panel, a vacuum fluorescent display).

Ur1 limits the base current of Queen1 to around 5.5mA new. This would provide enough saturation current for a weight of upward to around 55mA, which is usually probably lots.

L2 ensures that Queen1 will be converted off (not sourcing present) when the 74LT47 result is not really sinking present. It may demonstrate unnecessary.

Futaba 13-MT-54NA Of course, before I could put this vacuum fluorescent display to make use of in my last task, I needed to first construct a drivers outlet to generate this display. Unlike traveling a, generating a VFD is a little bit more complicated due to the several voltages included and the comparable potential requirement for the filament. Of course there are many specific chips we could make use of to build a VFD motorist with, but like with several of my previous projects I enjoy to create points from scrape so I believed I would build the filament car owner and the VFD motorist myself. One of the important design factors for the filament car owner is definitely the want to “float” the filament potential above the terrain. This offset voltage can be necessary to avoid ghosting (see this for even more detailed explanation). Furthermore in order for the lighting to become standard, an Air conditioner drive present waveform from á center-tapped transformér is usually desired.

Dec 10, 2017  Users » wim » Notebook » Vacuum Fluorescent Display (VFD) drivers Vacuum Fluorescent Display (VFD) drivers. Vacuum Fluorescent Displays (VFD) have been around for quite some time, but they are still popular. The device has a filament of parallel wires that is heated and emits electrons. The filament also serves as cathode.

A typical filament traveling waveform will be illustrated beneath. Filament Voltage Waveform Thankfully, we can produce this wavéform by biasing thé middle tap of a heart beat transformer above the floor and nourishing a square wave through it. The subsequent circuit design shows such a filament motorist circuit using a 555 timer and a center-tapped transformer. The 555 timer is certainly configured as an astable oscillator. Given the RC ideals chosen (1k, 4.7n), the operating rate of recurrence is right around 100 kHz.

The diode across R1 ensures that the result waveform from pin number 3 provides a 50% responsibility cycle. This schematic is usually not working for me. I have got wound the toroid 4:3 with middle tap and one of the insight leads linked to 5V. I have used TIP50 and MJE340 because I put on't have BD137. The issue is that after R3 the waveform appears bad and right now there's about 500mV drop on that résistor. The transformer is certainly good I have got examined the continuity on all prospects and they verify out perfect. 555 results a nice waveform with 50% duty cycle at about 100kHz at 4.5V or therefore.

So I wear't know if you've utilized that schematic in the end and it proved helpful out, but fór me it doésn't work. Furthermore the pcb image does not really reveal the schematic. There are usually two diodes missing from it and right now there's an additional capacitor. Care to tell us exactly what worked well for you?

Furthermore I've tried some smaller sized transistors, furthermore with fill on the some other side of the transformér, and without fill. I obtain on the output only some large surges of about 30V or so but real short.

Hi Bob, This is the specific routine I utilized in my VFD clock create , The diodes are soldered on the complete opposite part of thé PCB and thé two caps are in parallel as I didn't have got the cap of the correct value. Anyhow, The waveform going into the bottom will appear a little bit strange as as soon as the transistor begins to perform the Vbe will be clamped at about 0.7V. Could you sophisticated a bit even more on what didn't work? As soon as the signal is functioning, you should become getting a voltage across the supplementary winding. One issue to pay attention is the stage of the twó halves of thé windings, if yóu linked them the incorrect way around, you wouldn't get any result as the two opposing phases will become cancelling out there. You can easily confirm this by measuring the result voltage against the center tap.

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Hello and thank you for replying:) My concern was that after Ur3 sign was degraded true bad. Before R3 (at pin3 of 555) the indication was correct with no issues. I actually didn't think about the phase cancelation, will do some checks with the transformer.

I already took it out fróm the bréadboard but probably will get to it tomorrow. I also removed the transformer and just used a resistive weight for the transistor, same deal. Sign ok at flag 3 but completely gone after L3. It'beds not eliminated, it's just real small and just has some surges here and generally there, no rectangular wave. Looked át it with the osciIloscope. I have this VFD that I retrieved from a Panasonic microwave oven, it's á NEC fip6bm9l with no details online.

I scored the filament supply before having it out and it has been 2.2VAir conditioners with 125mA (experienced a limiting resistor in collection of 6.4ohm with 0.80V fall on it). Ok, I attempted it once more. I made the circuit all more than again, I possess used an remote variable supply for 5V. I possess utilized my 0won SDS6062 oscilloscope to measure everything.

Having an singled out supply allowed me to measure the complete output of the transformér. As a load I used 17.5ohms extracted from collection/parallel linked resistors. These are usually screenshots of thé oscilloscope at various periods: Very first check with TIP50: Indication at pin 3 of 555 without TIP50 connected: Seems ok, 105KHz, 4.6V amplitude.

Vacuum Fluorescent Display Pinout

555 will be set up and operating. Signal at pin3 of 555 with TIP50 linked: Signal at TIP50 door: Indication at TIP50 enthusiast: Amplitude: Frequency: Transmission at one óf the transformer's i9000 results: Rate of recurrence is someplace at 26KHz So far these dimensions were produced relative to ground. This can be the full output of the transformer, this is definitely what the VFD filament will get. Frequency is definitely someplace at about half the initial 100KHz. This is usually the 2nd test with a small transistor 2n3904: Indication at flag 3 of 555 with 2n3904 linked: Signal at 2n3904 door: Signal at 2n3904 enthusiast: Signal at one óf the transformer't outputs: Again, so far these measurements were associated to floor: This is certainly the complete result of the transformer: Therefore as you discover either way the output looks genuine bad and can be in no way near to the 2.2V or therefore. Didi you happen to make it function like that exactly with BD139?

Shouldn't it work with other equivalent transistors? Any other tracks I could consider?

Maybe opamps? 2.2VAir conditioners with 125mA can be about 0.275W which is usually low more than enough to end up being driven by an óp-amp I guess. You were right, I do mess up the transformer. I made a decision to unwind the secondaries and breeze them back properly. After performing that it appears that the entire thing arrived around. Right here's a scréenshot of the indication across the filaments: So it appears good.

Not really quite as very much as I'd want but it's almost there. I made a decision to gentle up a full portion to observe what'beds what and I required to get another strength offer, For 555 I used a breadboard card that's 5V set.

I utilized my laboratory variable supply for powering the portion. Last period when I used DC I could lighting up the section with 5V. Today I needed about 11-12V to perform that. I referenced my laboratory supply terrain to 555 ground. Right now I have got a ghosting impact that's real poor.

Any way I can get free of it? It shows up almost immediately as the section lights upward, ánd it's all ovér the other sections. Hi, say thanks to you for the fascinating circuit!

I restored some 16-portion by 20 heroes VFDs and the related anode/grid driver ICs from boards that I picked up in a flea market, and I should including to function on them. I talk to you assist to let me recognize how to conjugate your power source with my drivérs, because they work with unfavorable voltages. The ICs are: 10941 and 10939 made by Rockwell (yóu can download thé information sheet at this deal with: ), one fór grids and thé various other for segments. They very fascinating because they include the character generator reasoning. But their application diagram is usually not so clear to me. They possess three voItage pins: Vss (“Powér and signal reference”) will be at +5V; Vdd (“DC Power”) is at -15V; Vgg (“Display Voltage”) is certainly at -45 Sixth is v.

Reasoning pins from the host require pull-ups tó Vss fróm TTL sources (reasoning “1” is at Vss); logic “0” will be adverse referenced to Vss or linked to Vdd. The filament offer is not described and therefore is usually the center faucet. I guess that I have to connect the middle touch of the transformér to Vss, ánd I experience that there is no issue interfacing with the web host (I need to make use of Arduino) because the referrals of the drivers ICs will be suspended (am I best?). But I are not sure about the method to put the zener diodé between the middle touch (E) and ground (A), which is definitely recommended to obtain cut-off prejudice voltage. As you can study from my posting, I'michael new to VFD circuit design and I should like to avoid damaging either thé display or thé ICs with án incorrect approach. Thank you in progress! This is usually awesome, thanks a lot for the information!

Using your diagram I built the filament driving routine and it'beds lights the display simply good, but I've obtained a issue with current draw. I'm using a 3A strength transistor but it gets REALLY warm. I wear't have got a meter that can measure current or voltage at high frequency, however my coils only steps about 0.8 ohms on the main side therefore at 5 volts I visualize it't exceeding the transistor'beds ranking.

Vacuum Fluorescent Display Drivers

What's the designed impedance of the coil, and/or the present draw of this outlet? I was getting back again into electronics after a long time apart, and preparing to test with multiple vintage display technology and vintage clock chips (not preparation on heading Arduino of uC/actual time clock yet). I.really. like the idea of your routine for powering VFD filaments. Between not having to use a even more heavy transformer, and the novelty/challenge of winding my own transformer, that will be a plus.

Vacuum Fluorescent Display Filament Drivers For Macbook

I will be using both discrete VFD tubes for numbers, as well as a classic VFD clock display pipe - for a 4 or 6 digit construction. Do you envision that your signal would become capable of powering the filaments fór all of thése configurations, if I place the tubes in the under the radar program in parallel? In my unique VFD clock fróm 1978, I had the under the radar pipes in parallel ánd four of thém pull about 80mA at roughly 2V. It appears to me that your outlet would do it.

I feel planning to make use of the same motorist transistor that you do. The nearly all recent remark I found regarding - my hope would become that the strength that this function consumes will not be even more than state, the same as what the filaments consume. Excellent write-up, and I look ahead to searching around your web site more.