Joe,You need to know your disc is positioned right before you do anything. Then you can rule it out (or not) as the case may be. Trail and error works normally by swinging in its cradle, otherwise do as Gary suggested several posts back and use a magnet sweeping past a coil connected to a 2 channel 'scope. The 'scopes other channel should show the normal mains 60 Hz waveform as a reference (sourced from an old phone charger transformer)
Two magnets either side of the disc (diametrically opposite) is better for balance, or if you want to show off use a photo-electric cell with a vane tripping it like this http://www.youtube.com/watch?v=Vd3tjmEk3aQ
(You need to skip to around 2 mins in)You can see in the vid the scope of phase movement obtained. But you will only get that amount by using the correct value of capacitance in John's circuit to start with - again trial and error.
Worth it in the end though as the SRSG will sound really sweet. Phil -------------------------------------------------- From: "Jon Danniken" <danniken@xxxxxxxxxxx> Sent: Friday, July 09, 2010 1:50 PM To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Subject: Re: [TCML] SRSG "sputter"
Joe Mastroianni wrote:What I'm noticing is that at below 1/2 voltage on the variac, the gap is happily firing, and things are calm and sparky. When I go to about 2/3 power, I start getting a sharp crackling from the area of the gap itself. Sometimes the safety gap on the SRSG fires, and sometimes it doesn't - but if I go even higher on the voltage, my Terry Filter safety gap goes off so I shut down. Sometimes, the none of the gaps fire and I get a quick arc in the vicinity of the outer turns of the primary.I had a similar problem until I physically changed where the electrode disk was on the motor shaft. The Freau controller works great, but it does have a limited range of adjustment, and the electrode presentation has to be within the window provided by the controller.It took a few attempts, but drawing some marking on the disc with a sharpie helped me to adjust it just enough to get it within that window.Jon _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
Regards Phil Tuckwww.hvtesla.com
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