Author Topic: SSTC Micro  (Read 170 times)

Offline jockoFergy

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SSTC Micro
« on: May 16, 2020, 09:47:54 PM »
Hey everyone!
   After months of tuning and measuring voltages I finally got my Micro SSTC to spit some fire, but could be better... I am using Steve Wards micro almost exactly, except my interupter 555 has adj feq and duty cycle. I can add schematic if need be but my question might be easily answered, so Ill start off simple... so i got some 3 cm breakouts which is an achievement for me but i noticed when i touch my flathead to the trimmers(both for freq and duty cycle) the streamers double in size. I'm wondering, does that mean something with my ground isn't optimal? If its not that simple i'd be glad to post my schem, pics of coil and scope. running at around 300 kHz btw...
Thanks in advance!
Jocko
« Last Edit: May 17, 2020, 06:16:55 AM by jockoFergy »

Offline Mads Barnkob

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Re: SSTC Micro
« Reply #1 on: May 17, 2020, 07:58:45 PM »
Hi Jocko and welcome to HVF!

Your body is a capacitor in the high frequency world, you act as an amplified feedback signal injection into your circuit.

Try to increase the feedback in the antenna to the driver circuit by having it closer to the secondary coil.

Please do post pictures, video and everything else you want to share.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline davekni

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Re: SSTC Micro
« Reply #2 on: May 17, 2020, 09:42:29 PM »
The 555 in Steve's circuit appears to be used to start the oscillation, not as an interrupter.  Your version should work as long as the 555 frequency is somewhere near the coil resonant frequency.  Your issue could be that the coil is running at the 555 frequency instead of resonance.  As Mads suggests, placing the antenna closer should help, causing antenna feedback to override the 555 frequency.  (That's the circuit intention, for the antenna to override.  That happens more easily the closer the 555 frequency is to resonance.)

David Knierim

Offline Magneticitist

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Re: SSTC Micro
« Reply #3 on: Today at 03:24:20 AM »
Yea the 555 is there to just kickstart/maintain the oscillation and feedback and is supposed to help keep it stable when loading it but I've found it unnecessary so long as I start the circuit up. Steve set the 555 at around 300khz or so which is close enough to the resonant frequency of the coil to get the feedback to take over properly. I added a 74hc14 instead although that isn't really necessary either. The antenna feedback can get wonky but it works well enough if arranged properly. Using some type of ground plane seems to help as well as placing the antenna of a certain length at just the right location near the coil. Steve has the enable pin tied to the input on his circuit but you can separate them and add your interrupter addition to control the enable pin. 

I noticed recently his website is down but luckily it's archived on the waybackmachine for anyone interested https://web.archive.org/web/20190111164436/http://stevehv.4hv.org/SSTCindex.htm

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Re: SSTC Micro
« Reply #3 on: Today at 03:24:20 AM »

 


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