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New NST, Wattmeter kit
Terry, John, ALL
I have run into an opportunity for beginning, intermediate coilers.
We may have access to 12kV, 30mA <NEW in box> NST's. Estimated
cost of $15 ea, (shipping and handling extra). Please contact
off list for future information concerning interests, quantities, and
availability.
I'll have to do some homework on the SS wattmeter. Being an EE, I am
concerned about optocoupler physical clearance from HIGH POWER
conductors (0.1 inch clearance from 120/240 conductors with 1kV impulses
is like playing with a loaded gun). Even with external shunts, design
is marginal for anything over a small table top coil (~ 1kW input).
I've started working on my large power controller (~ 14kVA input) again,
and this issue will be on the plate for consideration soon. One
possibility is fiberoptic links from photoLED's at power voltage /
current levels to transistors at analog +/- 15VDC levels. (Terry please
reply off list on suppliers, balancing components for fiberoptic parts
you used on your fiberoptic projects). Another idea is small plexiglas /
lucite light pipes to provide galavanic isolation. The MAXIM MAX427CPA
instrument op-amp upgrade (versus 741) worked very well, with varying AC
lamp load while maintaining fixed input VAC, from 100W - 1.1kW, circuit
non linearities and errors were less than 1% across most of usable
intrument span :^)
If enough population out there is interested, I can pursue with some
local PCB fab houses about making boards (single sided). Board cost
would be reasonable, and a decent kit should be able to be made for a
reasonable cost...
I also am selling HV safety signs, along lines of Safety FAQ's on this
list, the safety signs list major hazards attendent with Tesla Coil / HV
Hazards and is fashioned after IEEE osha standard signage. Likewise
contact off list from pricing and further information...
Regards
DAVE SHARPE, TCBOR