[NewCandle] Long and winding LED road

[Jones Beene]

Nick

Interesting - more comments later. But as to this one:

> I spent part of this past weekend trying to get an
> oscillator circuit running ala the schematics shown
> here and there on Hartmann's site.  No luck - I know
> they work, but it may be I don't have the right turns
> ratio on my loopstick or something.

Two of those oscillators posted do not work well with less than a watt 
of P-in, which is 5 times too much. You need to keep at least one wire 
in the open (Avramenko) configuration for the capacitive coupling, and 
those two circuits dropped the open wire. The stray capacitance has 
apparently evolved into a necessary "feature" instead of a problem, but 
this involves isolating the setup away from other possible input 
sources. You can take it out into a field or yard, once it is working to 
convince yourself that it is not drawing power from something in your 
lab. It actually works better outside.

There will be a new osc design posted to Dr Stiffler's site soon. It 
should be most interesting.

In the mean time, a few of us have been playing around with the 
"negistor" as an oscillator. DrS did not have great luck with it, as he 
only had the 2N2222 around and not the 2N2222A -- which makes quite a 
difference. But I think that his new oscillator circuit, when posted 
today, will be better. He has mentioned some amazing results.

Here is the old JLN page, which I am sure you have seen:

http://jlnlabs.online.fr/cnr/negosc.htm

Go to the bottom of for the 3 transistor setup.

The idea behind the negistor is this ... for the lowest possible P-in 
and highest RF power from the oscillator into the primary - then it will 
pay to use any possible negative resistance and to do that - and to get 
enough power you need to go with three 2N2222A operating in reverse 
mode, in series. You need a much smaller cap than the one on the JNL 
page to get up to 3 Mhz.

This involves going to a higher voltage battery input - but much less 
current draw from the battery. With less than 18 volts (two 9 volt batts 
in series) and only ~10 milliamp P-in, the negative differential 
resistance is -200 Ohms. This can give ~2.7x time the apparent voltage 
through the primary coil or roughly 50 volts, meaning a much lower ratio 
is needed if are shooting for an apparent 100v from the secondary into 
the "plug".

You absolutely need to be able to light an NE-2 from the open wire thus 
the 100 volts. If you cannot, then you are not in the "SEC mode" as he 
calls it. The (effective) 100 volts of RF is the threshold for the 
effect. An immediate goal is to brightly light up 30-40 LEDs with less 
than 200 milliwatts P-in. This is a 7-1 advantage over DC. Comparisons 
can be verified with a light meter.

However, given that the new circuit should appear today on his site, 
please try that instead of the negistor, and keep the Av open wire 
configuration (one or two).

Jones