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Multi-layered Sec + batt
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From: Alfred C. Erpel (Home) [SMTP:aerpel-at-pil-dot-net]
Sent: Tuesday, March 24, 1998 6:14 PM
To: Tesla List
Subject: RE: Multi-layered Sec + batt
> From: Dale Hall [SMTP:Dale.Hall-at-trw-dot-com]
> Sent: Monday, March 23, 1998 5:11 PM
> To: Tesla List
> Subject: RE>Multi-layered Sec + batt
> Hi Alfred,
> I have been using battery power TC's regularily. I use conventional
> Pri & Sec's, a vacuum switch as a gap (quiet, - the only sound is the
> HV discharge: nice for the desk, and fast quenching and small ~2x1"
> "T" shaped - SPDT transmit - receive switch I believe was the
> original application), and a flyback for HVDC. One of the advantages
> of DC is that I can select larger value resonant Caps. For example
> with a .1 uF 5kVdc ruby mica (~2x1x1/8"), Pri=11"x1/8 copper tubing
> (tap 3-4T), Sec = 8.5"x20 #22, I get 8-10" discharges at 1-2 per sec
> using 9v batt at 40ma powering a 1" cube flyback extracted from an
> old camcorder's 1" monitor. (custom electronics could reduce the
> steady state current to a few mA). Going to much higher DC voltages,
> say 20-30kV much longer discharges are possible. The discharge rate
> is controlled by the current sourcing capability of the flyback - the
> more current that is available the faster the Cap charges to (RC) the
> more sparks per sec - at the cost of mo!
> !
I agree that at least at the low power levels for these small coils, DC is
easier to work with. Please explain the details of your vacuum switch
(manufacturer, size, part number, etc.) I was thinking of using a small
vacuum tube as a spark gap for this type of low power application. The
theory is to find two plates spaced appropriately (on some tube) to give you
the breakdown voltage you would like and also not be passing so much power
thru a small area to vaporize it.
8-10 inch discharges from less than 1 watt!!!!!! This supports my belief
that much longer sparks are attainable from the power levels that most
people are running their coils at. This is why I am winding my high
inductance series pancake coil.
> re input (battery) power required. This mode allows me to analyze on
> a storage scope each spark relative to the gap firing that caused
> it. For example the many on the list have been looking for a way to
> straighten out a jagged discharge to measure it. Using this
> controlled approach I've been able to do that electronically. i.e.
> longer path sparks show up as longer periods. On the above coil last
> evening using a 7" pointed Sec control, gap time to spark varied 9 to
> 12 us for the same pri energy (1.25J) and appears to represent varied
> path lengths of individual firings.
> (boy, this IS fun!) Dale
I envy your storage scope and your ability to use it. I just acquired but
have not yet learned how to use a very nice dual channel Hewlett-Packard
analog scope, I also have a function generator and counter. I would love
to pay someone to tutor me to kick start me in their use. I live 30 miles
north of Philadelphia, Pa. (USA) 3 miles from Doylestown. I agree, this
stuff is fun!
Regards,
Alfred Erpel