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Registered Member #62265
Joined: Sat Apr 28 2018, 11:26AM
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Posts: 24
Gordon wrote ...
Here's mine using saltwater capacitors with 12 beer bottles in a 5 gallon bucket gave me 12.5 uf but not efficient but worked
That's awesome. I like the mini-streamers where the aluminium foil is kinked... looks cool.
Gordon wrote ...
Here are some cheap capacitors that work they haven't blown up yet but they work they ship from China so it takes awhile to get here but using these you have to parallel resistors to each capacitor. TOOGOO(R) 100pcs CBB Metallized Polypropylene Capacitors 104J 0.1uF 1600V Font color white, black random
I already have a pack of those waiting for me to engage in earnest. Gathering all the bits together always seems to make the actual task seem less daunting. I also have a 200 pack of 1W 1mohm resistors that I've been wiring 4 in series and then covering in heat-shrink to get the voltage tolerance up. They work well in the Marx generator, which is driven from a TV-style flyback transformer so I'm guessing upwards of 20kV.
Registered Member #61890
Joined: Sun Nov 05 2017, 05:57PM
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Posts: 8
I think i have an idea for you. First you can approximate the frequencies with an online tesla coil design software (I can recommend http://www.classictesla.com/java/javatc3d/
javatc3d.html for that purpose). Secondly you can tune most tesla circuits in a certain range. This is true for SGTC (tapping the primary coil) and most solid state can be tuned too (for an SSTC I think this might be a solid starting point http://uzzors2k.4hv.org/projectfiles/pllsstc1/PLL%
20Half-bridge%20SSTC%201.GIF).
If you want to go the SGTC route, you need a HV-transformator and caps. The easiest thing is probably to gut some microwaves for the transformators and hv-caps.
Registered Member #62265
Joined: Sat Apr 28 2018, 11:26AM
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Posts: 24
Fumeaux wrote ...
I think i have an idea for you. First you can approximate the frequencies with an online tesla coil design software (I can recommend http://www.classictesla.com/java/javatc3d/
javatc3d.html for that purpose). Secondly you can tune most tesla circuits in a certain range. This is true for SGTC (tapping the primary coil) and most solid state can be tuned too (for an SSTC I think this might be a solid starting point http://uzzors2k.4hv.org/projectfiles/pllsstc1/PLL%
20Half-bridge%20SSTC%201.GIF).
If you want to go the SGTC route, you need a HV-transformator and caps. The easiest thing is probably to gut some microwaves for the transformators and hv-caps.
I hope that helped a little.
Thank you for this... that is a really interesting circuit. It took me a little while to work out what is going on but now the penny has dropped it looks really inviting. Incidentally, I have two MOTs and HV capacitors and I would like to get around to building a SGTC eventually, but the SSTC you suggested looks more enticing right now. (I have to admit that I was a little disappointed to find that the power transistors used are MOSFETs, since I'm intrigued by these IGBTs that are available nowadays and was hoping to get a chance to play with some, but I'm sure their time will come.)
Registered Member #61890
Joined: Sun Nov 05 2017, 05:57PM
Location:
Posts: 8
Andy Kay wrote ...
@Fumeaux: I'm very enthusiastic about this little circuit! I've ordered all the parts and I'm looking forward to trying it out. Thank you so much.
No problem, but there 2 more things I want to tell you. First, the capacitor on pin6 & 7 sets a certain frequency range. You can read more about this in the datasheets of the cd4046. Second, I wrote some extra information for you. I recommend to build the green and red sectors on different breadboards inorder to upgrade the TC in the future.
PS: As it is only halfwave rectified you dont have to worry about overcurrent, but if you use fullwave in the future you will need to build an interrupt curcuit. And the last thing: Make sure to have a big enough heatsink for the mosfets.
And the really last thing: think ahead and protect your mosfets (zener diodes, flyback diodes,.. like here http://rpsx.eu/upload/U3RBsZAI.png) or buy plenty before you play around/ or get a variac
Registered Member #62265
Joined: Sat Apr 28 2018, 11:26AM
Location:
Posts: 24
Fumeaux wrote ...
No problem, but there 2 more things I want to tell you. First, the capacitor on pin6 & 7 sets a certain frequency range. You can read more about this in the datasheets of the cd4046. Second, I wrote some extra information for you. I recommend to build the green and red sectors on different breadboards inorder to upgrade the TC in the future.
PS: As it is only halfwave rectified you dont have to worry about overcurrent, but if you use fullwave in the future you will need to build an interrupt curcuit. And the last thing: Make sure to have a big enough heatsink for the mosfets.
And the really last thing: think ahead and protect your mosfets (zener diodes, flyback diodes,.. like here http://rpsx.eu/upload/U3RBsZAI.png) or buy plenty before you play around/ or get a variac
Thanks for the extra guidance. I already have experience of gate sensitivity from playing around with Marx generator drivers, so I have plenty of 15V TVSs and Zeners. And I already have a 50A full wave rectifier that I considered using, so it would be good to know more about this "interrupter circuit" that you mention.
Registered Member #61890
Joined: Sun Nov 05 2017, 05:57PM
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Posts: 8
Think of it like pwm. The frequency of the pwm is an audible frequency and with the width you controll the power. An interrupter sends a pwm to the ucc-chips and turns them on&off (pin3).
For the diagram, there is a lot of them on google. But generally, there are simple ne555 timer ones or musical interrupters.
Registered Member #62265
Joined: Sat Apr 28 2018, 11:26AM
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Posts: 24
Ah... okay, so you seem to be saying that replacing the rectifier diode with a bridge rectifier will mean that some method of current limiting is required, and the interrupter circuit fulfils that role, right?
Registered Member #61890
Joined: Sun Nov 05 2017, 05:57PM
Location:
Posts: 8
Andy Kay wrote ...
Ah... okay, so you seem to be saying that replacing the rectifier diode with a bridge rectifier will mean that some method of current limiting is required, and the interrupter circuit fulfils that role, right?
Yes kinda. But you limit the power in the mosfets. The biggest reason is: you can maximise the arclength (voltage in) without burning up the mosfets. And lets be real. A musically interrupted TC is awesome.
Without interrupting it is called CW-mode looks like this: https://www.youtube.com/watch?v=4lyhIyLlTug this is demanding on the mosfets
And here are some interrupters from kaizer: ne555: http://kaizerpowerelectronics.dk/wp-content/
gallery/2009_07_22_-_Kaizer_SSTC_III/
KaizerSSTCIIIdriver.gif musical: http://kaizerpowerelectronics.dk/wp-content/
gallery/2016_09_03_-_music_modulator/
musicmodulator.gif both in configuration: http://kaizerpowerelectronics.dk/wp-content/
gallery/2009_03_15_-_kaizer_SSTC_II/
KaizerSSTCIIdriver.gif
Registered Member #62265
Joined: Sat Apr 28 2018, 11:26AM
Location:
Posts: 24
Yes, I can see how the 555 is used here as a kind of PWM "volume control". The musical coils I will leave for now. I'm assuming that the four secondary coils in the last .gif file are for driving a full bridge MOSFET configuration... I like that idea. For now I'll work with the simplest of the configurations you gave me, and I'll let you know how I get on (though it may take a while). Thanks for all your encouragement and advice Fumeaux.
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