Lidmotor's Penny circuit help needed.

[Legalizeshemp420]

You just made me check again. I wanted to make sure I had the MPSA18 in there! And it is.
I warmed the battery using the soldering iron to raise the voltage, and the LEDs come on visibly at a battery voltage of 0.610 volts.

Well, SPICE is not going to do it.  It could be anything causing it not to do a real world scenario but when you have over 30 different items you can adjust per simulation run there is just too much to handle.

This is making me despise simulations because there are some oddities that they can't simulate.  Sort of like a Tricorder from Star-Trek or that transistor identifier that doesn't know what something is until it sees it first, or is entered.  I am sure I could eventually get it to mimic real life but to what end and how many decades do I have to modify all of the data to get it to do it?  It is not something as simple as changing 1 parameter because when you change 1 another might have to be changed or it will error out.  Too many variables for me.

[Legalizeshemp420]

Here is one for you.  0.7V backwards MPSA18 and the probe is on the base and the ground (the ground is hidden below the LEDs but always remember it is there).

[TinselKoala]

Well, that's strange. I'd like to see that expanded, it looks like a single classical inductive ringdown envelope. Again, I'm not convinced you've captured a whole cycle yet there.

One issue might be the LEDs. I am using superbright blues, but I don't know the part number or manufacturer. My Fluke 83 DMM reports the forward voltage as 2.6 volts and the LED draws 220 microAmps at that voltage... and is already fairly bright. (Microammeter in series with the Fluke, with the Fluke in diode check mode.)

When supplied with a regulated DC supply (HP721A) the diode begins to glow visibly at 2.295 V and a current of 1 microamp! To put 20 milliAmp through it I need to go to 3.5 volts and the LED is blindingly brilliant.

[Legalizeshemp420]

Yes, it does look like that doesn't it?  This LED (I tried to make another and it never worked) is a BLUE LED
Vf = 3.45V @ 20mA but I am not certain about that because every LED says GENERIC / LED_RED so obviously National just did a C&P job.

I am about to put up the video of it on Youtube so I will post back in a bit.

[Legalizeshemp420]

www.youtube.com/watch?v=7XlXCnY5bZY

You know I wonder if what is causing your continual oscillation could be because the circuit is actually inside the toroid and it is somehow having a case of feedback however minimal?