Re: Negative Resistance

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

Original poster: "S & J Young by way of Terry Fritz <teslalist-at-qwest-dot-net>" <youngs-at-konnections-dot-net>


Good thinking!  Where do we get KW tunnel diodes or P-N FET combos?  I
believe the Poulsen arc oscillators are an example of high power negative
resistors.

Here's another, lower powered thought:  Could one hook a Lamda or tunnel
diode directly to a primary LC, causing it to be a few milliwatt oscillator,
dangle a scope probe "antenna" a few feet from the secondary, and real-time
tune the primary to the secondary by finding the primary tap point that
gives the highest scope trace amplitude?  Probably would have to move the
tap out a bit more to compensate for streamer loading under normal
operation.  Or, could one just add a wire to the toroid the same length and
direction as a typical streamer, and use your lambda diode  /scope antenna
tuner to tune it "dead on" for normal operation?

--Steve Young

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, January 06, 2003 7:30 AM
Subject: Negative Resistance


 >
 > Original poster: "Jolyon Vater Cox by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
 >
 > I am wondering how a spark gap compares to a lambda diode.
 > Both are "negative resistance" devices;
 > with spark gap
 > increase in current coincides with decrease in voltage.
 >
 >
 > It is also possible to have an increase in voltage coincides with decrease
 > in current-
 > is this also negative resistance? Is this not what happens with the lambda
 > diode and also with the tunnel diode? Is this behavior the same or
 > different to the spark gap?
 >
 > Would it be possible to build a "power" lambda diode to function as a
 > negative resistance device in a real Tesla coil?
 >
 > Jolyon
 >
 >
 >
 >