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SSTC 5 mini questions

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ZakWolf

Tue May 31 2011, 04:20AM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608

Board etching attempt one: Failed I dont think I exposed the board long enough I will get some more tomorrow and try again.

ZakWolf

Thu Jun 02 2011, 01:49AM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608

I was wondering what a better value for the GDT capacitor C6 would be, is 1uf to much? Steve says "C6 should be larger if possible as it improves gate drive" he has it on the schematic as .1uf, i just have to solder that in and add my antenna.

How does the antenna work, how tall does it have to be and which direction does it have to point, i am also going to use 40v ac for my first light, it is the highest AC transformer that i have will this work/ give break out? Thanks

ZakWolf

Thu Jun 02 2011, 04:44AM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608

Ok so I had everything set up and ready to go, I hooked it up to 120v for the first light, I didnâ€™t have anything lower, the out let made a pop and them I unplugged it, I tried it again and then one of my murg860g diodes blew up. I check there pin out and I think they were backwards; I switched them around after replacing the one that exploded. I plugged it back in and nothing happened no pop or buzz, I unplugged it and felt the parts for heat, nothing was hot, but I did get a 120v shock from the tops of the mur. Diodes. What is the problem I will try to get a picture up later.

polecat

Thu Jun 02 2011, 06:18PM

Registered Member #3909 Joined: Wed May 25 2011, 01:19AM
Location: Hartford, CT
Posts: 2

(first post) Hi all,
I don't mean to piggy-back off of an existing thread, but I am in the process of constructing Steve Ward's sstc5 as well. I have worked on a few SGTCs back in high school with one of my friends, and I thought that I might try my hand at making an SSTC. My background is in mechanical engineering, and my only electronics education was one course of linear circuit theory, so please forgive me if I am asking questions with obvious answers.

I have nearly all of the necessary semiconductor parts for the coil, and am in the process of trying to salvage the various capacitors from old computer PSUs, TV boards, etc. I've also wound a secondary identical to the one on Steve's page.

My question is this: James had mentioned that the 0.68uF capacitors connected across the mosfets are "not critical." Is this to say that their values are not critical? I can't tell if they are supposed to be tuned with the primary coil, or if they are there for some other reason. I have some 0.47uF caps rated at 275VAC that I pulled from a power supply, and I was wondering if these would work with this circuit.

Also, I have a number of non-inverting mosfet gate drivers here - TC4422. I was wondering if these could be used in place of the UCC37322/37321 gate drivers. I know that the ones that I have are only non-inverting: would it be possible to invert the output of one of the ICS using an op-amp or transistor? Or would that cause too much of a delay in the gate drive signal?

Thanks in advance,
John

ZakWolf

Thu Jun 02 2011, 08:16PM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608

So i was going over my board after I woke up, and i noticed that my 5ohm resistor was going across the source instead of the gate, i checked the other side and the same thing happened. I made sure when i was printing to select the mirrored setting. So every thing is in the wrong spot and backwards, if i flip every thing in wonder if it will still work?

ZakWolf

Fri Jun 03 2011, 09:57PM

Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608

Which board should I get ?

They seem the same, and there a lot cheaper then the ones i found in town.

Ash Small

Fri Jun 03 2011, 10:21PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

polecat wrote ...

(first post) Hi all,
I don't mean to piggy-back off of an existing thread, .
Thanks in advance,
John

I don't think you are 'piggy backing', Polecat. The thread is titled 'SSTC 5 mini questions', and you asked a question about the SSTC 5.

I'm not able to answer your question, I'm hoping James will log in soon. He appears to be busy lately.

(I'm interested in the answer to your question.)

Polonium210

Mon Jun 20 2011, 10:52PM

Registered Member #3450 Joined: Sun Nov 28 2010, 05:01AM
Location:
Posts: 61

Was my coil you posted a link to the video April 19. I have made many improvements to that coil since.

I have also audio modulated it.

kerver

Tue Jun 21 2011, 05:56AM

Registered Member #522 Joined: Thu Feb 15 2007, 01:04AM
Location: The Netherlands
Posts: 33

Polecat, It would almost certainly just perfect work with your smaller cab's on the half-bridge.

En im pretty sure it must not resonate with it. But your 0.5 farrad would do well i hope!?
Problably you can parallel a second cab on them for more jus.
The rolled one's are better, But your cube's chould work also just fine.

LittleVenture with wich wire size you rolled your secondery ?

I have wind a 3"diameter paper former with about 1 foot high 32 awg cu (110m 0,3mm, Former = 7.5cm dia, 25cm high)
Calculation about the freqentie without topload would be around 1 mhz.
Have it with a pll working with an ct in the secondary.
It give's untuned and 35v + 1 mosfet output driver a half inch blue litle spot on it.
Im planning to build a half or full bridge for it, make it a hard time with such a high freqentie, Becouse i wana do it low budget making it with components i have laying around here...:-)

Greetz

Ben Solon

Sun Jun 26 2011, 01:48AM

Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600

SublimeVolts wrote ...

I was looking at the charts of different subs (

) for different spark appearance, and was wondering what would be the best way to set something up where I could change out those values quick and easy?

back to the original question, i did something similar to make a cheap square wave frequency generator a while back. a potentiometer works well for the resistor sub point, i would recommend a 1MEG pot, and a 10k fine tune pot in series.

as for the cap, that's the tricky part. they haven't invented a variable cap with a range that wide yet, so i used a rotary switch with 6 contacts. then just wire 6 of your favorite cap values, one to each contact, then drop that whole thing into the cap sub point.

not the most high tech method, but it gets the job done

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