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How do i visually know drsstc is in tune ? Longest sparks?
And what is better in primary circuit - more capacitance or more wire turns?
I experimented with 1-10 nF with 6-12-18 turns, but not as much success as without it. Sparks were hovever hotter and orange ( that happens when i have too much power in it )
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
I don't think it is possible to determine if your coil is in tune visually. Long arcs can be achieved in a few different ways. Tuning vs. settings of your interruptor. Best thing to do is use a function generator and an oscilloscope, tune to match primary and secondary resonance, light it up and see what you get. You can adjust tuning from there to get optimal output. Using the function gen and scope will ensure you are very close to where you need to be. Eastern Voltage Research has a great paper on DRSSTC tuning, check it out! I read it about 5 times and tuned my coil up in a snap!! There are other methods of tuning, google DRSSTC tuning and see what you get. Curious how visually you would know if your arcs were at maximum if you don't know how big maximum is! Point being, dig a bit and you will get it tuned up no problem!! Hope this gives you a good place to start, check out that paper!
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Visually is part of it, but not all of it. Basically, the best way to tune a DRSSTC (and perhaps Steve can chime in as he has way more experience tuning the big guns) is slightly to a lower frequency at low power. So as the arc length increases (and arc capacitance increases changing the fres of the sec) the coil becomes more "in tune" at high power and generates much longer arcs.
I always recommend individuals tune in a scientific manner (albeit empirically) by measuring peak current / input voltage vs. arc length for each tapped primary point and understand the trends. From there, you can develop the optimum tuning point. Sure its a lot of work, but can really give you an understanding of how the coil works. Plot all the information on a graph and you can easily see how the coil tuning changes vs. arc length. Quite fascination really!
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Drsstc in tune - visually?
