J
Jymesion
Guest
I'm a writer, and although I keep telling myself I'm still an
electronics amateur, I haven't actually touched a soldering iron in
years. I hope you'll help me anyway.![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Partway into a story, I've hit a snag because I'm not positive a
necessary 'prop' can be made.
This problem is therefore theoretical in that I won't actually build
it, but my internal editor demands that it could be built, and I have
to know what, if any, limitations there might be.
(Sorry this is so long, but I hate asking for help and then having to
tell people, "That's a great idea, but it won't work here because
<insert something my original post didn't state>.")
Scenario:
A Cross looks to be of ivory with inlaid gold ribbon spiraling around
it. The stalk is about 2 inches in diameter and 3 feet long. The
crossbar is 1 inch diameter and 1 foot long. It's laying on an altar.
A suspect is told to pick up the Cross and swear to God he's innocent.
He does, then falls to the floor in agony and begins to go into
convulsions.
'Real' Situation:
The Cross is tubes of insulating ceramic, and the gold ribbon isn't
continuous -- there are gaps on the back of the Cross, making each
turn a contact plate connected to a voltage multiplier. A remote
control turns it on and off. Output (without load) is 300kV.
If the contact plates simply alternated + - + - + - etc., then it
might only sting the hands of the person holding it, and the effect
must be much more pronounced. (This was a real ritual, and the person
could pick up and hold the Cross in whatever manner they wished.)
What's needed is some method of determining which contact plates will
send the current through the person's body. Once that's been done,
servo motors driving rotary switches can connect the proper plates.
The selection can't be done using the remote because the official's
hands must be in plain view to prevent his making cabalistic signs to
influence the outcome (a tension switch on an armband turns it on when
he flexes his bicep).
The voltage multiplier, receiver, and servos already take up a lot of
the internal space, and it needs as much battery capacity as possible
because it'll be used repeatedly.
So: a user-built circuit no more than 1.25 inches in diameter, as
short as possible, using only off-the-shelf components (the circuit
board(s) can be etched as a one-off), to detect resistance(?) or
capacitance(?) between contact plates, determine which two are
optimal, and output their identity as hi/lo on four wires for each
servo. A microprocessor is not an option (the character building it is
competent in basic electronics but not in programming or burning
proms, and he doesn't have time to learn (he can't enlist outside
help)).
Any ideas?
Any help greatly appreciated!
electronics amateur, I haven't actually touched a soldering iron in
years. I hope you'll help me anyway.
Partway into a story, I've hit a snag because I'm not positive a
necessary 'prop' can be made.
This problem is therefore theoretical in that I won't actually build
it, but my internal editor demands that it could be built, and I have
to know what, if any, limitations there might be.
(Sorry this is so long, but I hate asking for help and then having to
tell people, "That's a great idea, but it won't work here because
<insert something my original post didn't state>.")
Scenario:
A Cross looks to be of ivory with inlaid gold ribbon spiraling around
it. The stalk is about 2 inches in diameter and 3 feet long. The
crossbar is 1 inch diameter and 1 foot long. It's laying on an altar.
A suspect is told to pick up the Cross and swear to God he's innocent.
He does, then falls to the floor in agony and begins to go into
convulsions.
'Real' Situation:
The Cross is tubes of insulating ceramic, and the gold ribbon isn't
continuous -- there are gaps on the back of the Cross, making each
turn a contact plate connected to a voltage multiplier. A remote
control turns it on and off. Output (without load) is 300kV.
If the contact plates simply alternated + - + - + - etc., then it
might only sting the hands of the person holding it, and the effect
must be much more pronounced. (This was a real ritual, and the person
could pick up and hold the Cross in whatever manner they wished.)
What's needed is some method of determining which contact plates will
send the current through the person's body. Once that's been done,
servo motors driving rotary switches can connect the proper plates.
The selection can't be done using the remote because the official's
hands must be in plain view to prevent his making cabalistic signs to
influence the outcome (a tension switch on an armband turns it on when
he flexes his bicep).
The voltage multiplier, receiver, and servos already take up a lot of
the internal space, and it needs as much battery capacity as possible
because it'll be used repeatedly.
So: a user-built circuit no more than 1.25 inches in diameter, as
short as possible, using only off-the-shelf components (the circuit
board(s) can be etched as a one-off), to detect resistance(?) or
capacitance(?) between contact plates, determine which two are
optimal, and output their identity as hi/lo on four wires for each
servo. A microprocessor is not an option (the character building it is
competent in basic electronics but not in programming or burning
proms, and he doesn't have time to learn (he can't enlist outside
help)).
Any ideas?
Any help greatly appreciated!