Re: Alarm system

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "robert heidlebaugh" <rheidlebaugh-at-desertgate-dot-com> 

Ah yes ,,,there is no thrill quite like getting your teeth jurked loose with
a 500v 500cap det generator. .. Keep in mind a silver bridge wire in a squib
is a dead short that is vaporized by current from the charged capacitor in
the detonator generator. A 1u capacitor charged up to 500+ volts that is
short circuit dumped into the lines when the "T" handle hits bottem or the
twist handle hits the peg stop . That is real current. Even the high voltage
squibs take 250 volts or more to fire and current of the charged capascitor
to fire the curcuit. A tc coil has lots of voltage to overcone a big gap,
but you still nead current from a toroid, capacitor , or something els to
store the current. Voltage is good, but current dose work.
       A micro wave horn neads a tuned stub to inject the Ac voltage into the
horn at the proper frequency to match the horn. Even the high POWER of a
magnetron tube requires a current loupe to inject Ac into a horn.
      Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Fri, 30 Jul 2004 20:02:20 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Alarm system
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Fri, 30 Jul 2004 20:05:08 -0600
 >
 > Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com>
 >
 > Hi Dr. R,
 >
 > I have also had the thought of adding a microwave horn in series with the
 > gap.  Wire lengths can be very long for hardwire systems, (15m and up) and
 > short for radio controlled systems.  At least the coil should produce enough
 > harmonics to key a reciever.  An out of tune secondary would help as well.
 > Most of the squibs that I have are the 12V pyro squibs for theatrical pyro,
 > which won't work.  Most caps will fire 1.5V range if I remember correctly.
 > I should check with the manufacturers about getting some squibs that are as
 > sensitive as caps for testing.
 >
 > It was smart putting the phenolic in the van!  I got there as it was just
 > sprinkling.  It would have been soaked if I had put it under your car.  I
 > got that soaked just getting out of the van.
 >
 > David E Weiss
 >
 >
 >> Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >>
 >>
 >>
 >> Dave:
 >>
 >> It requires a certain amount of I^2 * t to set off an elec. blasting cap.
 >> For blasting safety planning, a 25 mA maximum is required, however, this
 > is
 >> a large margin of safety.  For actual initiation a current of 250 mA
 > minimum
 >> is required per cap.
 >>
 >> I doubt you would get this induced current at any distance over 25 feet
 > with
 >> a TC unless the "receiving circuit" consisting of the cap lead wires just
 >> happens to be the resonant freq of your coil.  You could try SSTC and
 >> sweeping a range to get it to work.
 >>
 >> When you drop by for the caps I will give you some elec. squibs (burn not
 >> blast) to use for testing this range.
 >>
 >> You looked like a drowned rat at EAA so I thought it might work out better
 >> to get the phenolic at a later date.
 >>
 >> Dr. Resonance
 >>
 >> Resonance Research Corporation
 >> E11870 Shadylane Rd.
 >> Baraboo   WI   53913
 >>
 >>
 >>
 >
 >