plasma ball..help

hi any one know the values of condensators and resistances in the first post here? .........

http://forum.arduino.cc/index.php?topic=8386.0

R1/R2/C3/C4 form a Wien bridge oscillator I believe (180 degree phase shift network), so try googlin Wien bridge. C1 is obviously decoupling and C2 is likely a snubber to prevent over-high voltages on the transistor's collector. [The diagram omits the secondary winding of the transformer.]

Most likely, blocking oscillator http://mysite.du.edu/~etuttle/electron/elect37.htm Freq., and duty circle greatly depends on inductance of primary windings, than RC .

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reference digram;-

OY-12-2 is flyback transformer.

sonnyyu: reference digram;-

How are they getting 220V AC from a USB connector?

reference digram

C7's function as Capacitor Power Supply.

A Capacitor Power Supply uses a capacitor to interface between a “high voltage supply” and a low voltage – called THE POWER SUPPLY. In other words a capacitor is placed between a “high voltage supply” we call THE MAINS (between 110v and 220v) and a low voltage of 5v to 12V.

Sorry for poor quality diagram. that is all I can get.

Magician: Most likely, blocking oscillator http://mysite.du.edu/~etuttle/electron/elect37.htm Freq., and duty circle greatly depends on inductance of primary windings, than RC .

So why is there a Wien bridge feedback network? 180 degree phase shift + 180 shift from the primary (centre-tapped transformer I'd bet). Makes perfect sense to me and frequency is stable.