Lidmotor's Penny circuit help needed.

[TinselKoala]

I've made a video of what I'm talking about, but it will be a few minutes before it's processed and uploaded. Check this space in a few minutes for the link.

[Dark Alchemist]

I think something is seriously wrong with Spice as I did what you said and set it to single and 2.0V trigger level.  Nothing happened then I got a big burst and nothing but as the nothing was happening after that burst my LEDs were flashing.

The burst is almost 1000us long then nothing but the LEDs are flashing.  So, that means the voltage never goes over 2 volts to trigger the scope but those 3.45v LEDs are all flashing.

So, what gives, or basically WaTaF is going on with this simulation?

[TinselKoala]

I think something is seriously wrong with Spice as I did what you said and set it to single and 2.0V trigger level.  Nothing happened then I got a big burst and nothing but as the nothing was happening after that burst my LEDs were flashing.

What gives?

Nothing is wrong, your circuit is doing just exactly what I thought, and mine is doing the same thing, I think. I'm uploading a video explanation right now, showing how to catch the oscillation bursts. It should be up in half an hour or so, my upload connection is really slow.

http://youtu.be/9FDmkbCbKP0

[TinselKoala]

I think something is seriously wrong with Spice as I did what you said and set it to single and 2.0V trigger level.  Nothing happened then I got a big burst and nothing but as the nothing was happening after that burst my LEDs were flashing.

The burst is almost 1000us long then nothing but the LEDs are flashing.  So, that means the voltage never goes over 2 volts to trigger the scope but those 3.45v LEDs are all flashing.

So, what gives, or basically WaTaF is going on with this simulation?

Sorry, we crossed posts there. The Single Shot mode does one sweep after it's triggered, then you have to restart or repress Single Shot for another triggered sweep. So you captured a single sweep, probably, and then the scope stopped. Your circuit is still running and for sure there must be spikes in there that exceed the combined fwd voltage of the LED string, or they would not light.
It might be clearer when you watch my video. I _think_ I've captured the behaviour, but since I'm using a different transistor I can't yet be sure, until we are both showing similar scopeshots. We do seem to be making some progress, though!

[Dark Alchemist]

I will watch it once it is up but what I did was set it to single shot 3.4V (LEDs are 3.45v) and it never ever triggered BUT the LEDs were flashing like mad.

It triggers at a max of 2.25V