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Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Hi Tony!
Yes, the capacitor capacitance was measured before energization and also measured some time after the capacitor be running in pulse work.
I have found no changes in the capacitance. The window glass capacitor capacitance is stable, even when working long time with pulses.
The window glass (the cheapest flat glass) that I have used in Canada and Brazil has a dielectric constant of 8.9 to 9.2.
The electrodes are made of 0.015~0.02 mm aluminun foil that my wife use in the kitchen ... I have built some caps with thicker electrode and the result was not good, some corona inside the dielectric.
The leads are aluminun foil used in construction for roof flashing, 0.2mm thicker.
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Tony,
Yes, there are 2 tesla circuits in the schematic.
The first tesla is compound by CD, SSSG and T1. We may say that SSSG is sparkgap. The voltage line (220V) discharge through SSSG (triac) providing a pulse through CD and the primary of T1.
The second tesla is done by CT, GAP and TT. The secondary of T1 charges CT then the GAP discharge CT through the primary of TT. The pulse resulted by this discharged is increased by TT providing 15kV to the its secondary. As the secondary of TT is in series with the buzzbox and torch, the welding electrode drives a spark to the welding work.
It should be noted that in a period of 16 milliseconds ( one 60Hz period ) the circuit provides 2 or 4 pulses. The pulses are synchronized with the torch ac voltage.
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ARC STARTER AND STABILIZER - COMPLETED