gu-81 vttc

by:Rocket PCB     2019-12-25
I\'m trying to focus more on math and make it possible for you to build your tube without having to look up values on the Internet.
You should be able to really build your own!
Of course, you can use larger tubes.
More powerful and fun!
This project contains very high voltage that can kill you immediately! Be carefull!
The capacitor can store energy and it can kill you even if everything is unplugged!
I\'m not responsible for anything you do with this device!
Let\'s start: this is the system I designed for my GU81 VTTC.
Still, you can use any kind of large transmitter tube instead of GU-81.
In this case, or if you want another frequency, you need to change some values as shown below.
I am trying to make a table that can be stated to help you make the VTC with almost all the tubes, primary capacitors or frequencies!
I\'m sorry, I have a few. Vacuum tube? what is that?
If you would like to learn more about the tubes and 811A coils, check out this amazing note from Xellers!
In this project, we are using GU-
81 pentode, but you can use almost every triode, tetrode, or pentode you can find!
There are a lot of big tubes on Ebay and if you have the motivation to do some math and research, you can also do the project with other tubes!
I bought my tube on ebay for 28 euros (Germany).
Did you buy a cheap tube on ebay? Great.
The first thing you need to do is the high voltage source of the ist board and the high current power supply heated by the tube.
Find the data sheet from the tube you purchased and find out the required filament voltage and maximum anode voltage!
In my case, the rated voltage of the filament voltage is 12.
The maximum anode voltage at 11 Am ps is 6 volts and 3 kV is ratet.
Data Sheet of tubes often found on EbayGU
81 it is not important how to implement the ratet voltage of the tube given in the data sheet, but keep in mind two main aspects: 1.
The filament voltage should be around 0. 1 Volts -0.
2 volts higher than shown in the data table!
Most tubes run for a few hours a day, but I don\'t think you want your VTC to stay for a few hours: D
To prevent corrosion, you should drive your tube at a higher voltage.
In this way, it will last longer. 2.
The power supply must be able to draw the required current.
Some very large transmission tubes require heating current up to 20 Am ps.
Don\'t burn your power! 3.
Number of effective voltage! 12. 7 V DC = 12.
7 V ACYou can use both voltages at the same time.
But please don\'t think you need 2 ^ (1/2)
If you use air conditioning, there will be fewer times.
This mathematics has not yet worked.
Power supply you can use: MOT: I use a rewinding microwave transformer with an output of 12, 7 V AC.
I used a very thick wire so it can pull 30 amps.
In addition, you can easily adjust the output voltage and provide it ist for free; )
Ring Transformers: they are available at almost every voltage and can generate a large amount of current.
The only downside is that they are really expensive.
Computer PSU: 11 if your tube is needed. 8 -
12 V, this is the way to go!
In addition, you can also use DC voltage to power the relay of the preheating circuit!
Good for your vacuum tube and use pre-Heating circuit.
In this way, the tube will survive longer.
Simply power the tube in series with a 2 ohm resistor for 1 minute.
Then use the microwave relay to bypass the resistance (16A).
I cut out a part from a microwave PCB that contains Transformers, rectifier, and magnetic control relays.
Depending on the tube you use, you need a power supply with a voltage between 2 kV and 7 KV.
In a short period of time, your tube can withstand about twice the voltage.
This is what I pursue.
The easiest and cheapest way to achieve this is mikrowave transformers (2. 1 kV).
You can implement 4 using a multiplier cirquit.
2kv half wave communication.
If you need more energy, you can use more MOTS in the series.
Maximum voltage this time!
Remember to use 2 ^ (1/2)
In my case: 3KV class--> 6KV Max> (
MOT multiplier)2* 2. 1KV * 2^(1/2)=5.
94KVIf you have decided to use the multiplier (like I did)
This can be done with only the microwave capacitor.
But please do not use Microwave diodes for large tubes! ! !
Why don\'t I use these Microwave diodes?
The high voltage diode inside the microwave can reach about 12KV at 350 mA.
If you use multiple microwave capacitors for the multiplier (
I use 3 now)
350 mA is not enough.
In addition, there are not many 12 kV.
I simply connected in series with 24 1N4007 diodes to reach 24 kV at 1A and then all glued to the PVC pipe.
Cost of 30 Diodes: 0. 85€ !
Don\'t put 2 MO-
Parallel diodes.
This does not work!
The primary capacitor is very important and needs to match perfectly with your Xperia hem!
You can find the major calculations you need in step 10.
Still, I\'m going to introduce some general content about primary capacitors now.
Which capacitor is used?
You can use multiple types of capacitors in this project.
They only need to have the right capacity and need proof of high pressure.
The cheap way to achieve this is to connect ceramic disc capacitors or film capacitors in series.
The best way to remember 1/c1 1/c2 = 1/c3 is the door handle capacitors, but they are expensive, so I decided to use 20 film capacitors.
In step 10, I calculated my GU-
So I used the 1, 5nF capacitor (1250V)in series.
So I paid only 5 euros.
You need something to limit the amount of current flowing through the pipe grid and the feedback coil.
It doesn\'t matter if you use a high wattage resistor or bulb.
The most important thing is that the calculation is correct!
All calculations for GU81 pentodeR= V(Anode voltage)/(4*I(Anode current))=5900V/(4*0. 6A)=2458 Ohm--
> Use at least 2,5kOhm resistors! (at least 130W)W= (V(Grid Voltage)/R)*V(Grid Voltage)= (600V/2458Ohm)*600V=162 W--
> Use light blue with no more than 160W (I use 100W)
This is the most difficult part of creating your own VTC.
But you need to keep an eye on this if all you want is more than just copy values: DThis calculation will help you figure out the number of coils
Turn and what main capacity you need to get the frequency you want! 1.
Primary inductance: L = (N^2)*(u0*A)
/LA = wire section u0 = 4Pi * 10 ^-
7 N = secondary winding F = frequency D)
From my old chemicalsexperiments-
Put them into the ceramic pipe and I put it on top of topload.
The result is considerable (
They look better in reality! )
Even if it\'s not healthy at all, is it OK?
Please do not throw random chemicals into the flames!
Use Google first :)
Chemicals I have used:-> YellowCuSO4 --> GreenKMnO4 --
> Orange/red Other than that, you can now light up the neon tube and other gas discharge lights like a sodium discharge or mercury arc lamp!
But the most amazing thing you can do with the VTC is (50kh around! )
Sensor lights are on (
Well, I mean, you need to touch these lights to trigger them)
More than 50 kilometers away!
I can turn on my neighbor\'s bedside lamp which is definitely very weird as it will trigger these lights very soon and cause you troubleThe feeling of the House :)
I am very satisfied with these results!
If you have any questions or need help, just write a message or a comment under this note.
I will help if I can.
Please post photos if you have also taken them!
Please vote for me if you like this: d09. 11.
I redesigned my coil to make everything more compact.
This way, the project won\'t take up much space in my garage, which is fine :)15. 11.
2014 also, I found a larger feedback coil (13 turns)
The effect is better.
In addition, I made a controller with the status LED of the transformer, capacitor, two relays and each relay for preheating circuit and HV-supply. 21. 11.
Math was added 2014 Times.
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