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Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
I don't think he means break rate. I think he means resonant freq. You probably can get to 10MHz but you might not see much. I haven't seen many high freq SGTCs around.
Well I was just thinking if I made a small enough coil (probably the size of a toilet paper roll) and tuned it with teslamap to hit 10Mhz (10,000Khz), the coil would resonate at whatever the tuning is set too, and the break rate would just be determined by the gap distance determining how often that coil would fire away.
Question: Does the arc that travels through the gap resonate at those high frequencies as well, or will it oscillate at whatever the mains (be it 60hz for this) run at? Also, can I run DC through an A/C transformer with an SGTC with the same results?
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Arcstarter wrote ...
coillah wrote ...
The spark that bridges the gap oscillates at the natural frequency of the primary circuit.
Indeed, and that is why the primary needs to be tuned AKA have the same freq as the secondary.
Breakrate is normally 120hz (two times main) for 60hz countries, and 100hz in 50 hz countries.
I think you guys are misunderstanding his question at least somewhat. The break rate is independent of the Fres. Break rate is determined by your gap distance and fires when your caps are charged. You can have any break rate with any Fres. The gap firing is basically just connecting the DC voltage stored in the caps to the primary and completing the tank circuit which rings until the power is used up by either the secondary or wasted through resistance, or both.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
I think you guys are misunderstanding his question at least somewhat. The break rate is independent of the Fres. Break rate is determined by your gap distance and fires when your caps are charged. You can have any break rate with any Fres. The gap firing is basically just connecting the DC voltage stored in the caps to the primary and completing the tank circuit which rings until the power is used up by either the secondary or wasted through resistance, or both.
Exactly
As for my comment earlier, I thought he was talking break rates... oops
haha I guess I ended up talking about both, the more info the better I assume.
Any tips before I go about trying to build on of these sg style designs? I have also been looking into sstc designs as I have a board (built by tom540), but the fets are only good up to approx 400khz im told. High freq sstc designs are also quite tricky so I hear.
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High Frequency SGTC
