Lidmotor's Penny circuit help needed.

[Dark Alchemist]

How do I know what to put in that box to simulate a real battery?  I have no idea the internal resistance of a battery but if I remember right Dave Jones had that about his 9 volt batteries and that info is hard to find.  So, finding it for a 1.2V 800mah NiMH is probably going to be hard.

[TinselKoala]

http://data.energizer.com/PDFs/BatteryIR.pdf
http://data.energizer.com/PDFs/nickelmetalhydride_appman.pdf

[TinselKoala]

I made a printed circuit board for the DALM thing, just to neaten it up. I left out the 1.2 nF capacitor though. My supplier can't get BC337 so I used a socket and the MPSA18, but can change to whatever is necessary for testing.

http://youtu.be/jUraFI3sTYE

[Dark Alchemist]

Very nice indeed.

Oh, you forgot to make a video showing the three states you mentioned earlier as that would be interesting to see.

[TinselKoala]

I agree.... two states are shown in the RF video, but below the level of lighting the LEDs. Now that I've put it all on the PCB and put in a fresh battery, I got another surprising mode shift: At first the lights were moderately bright, then after half an hour or so I was trying different transistors (none work as well as MPSA18) then when I changed back to the MPSA I was putting it in the socket and was able to kick it into the brilliant mode, with much brighter LEDs. I didn't have the scope hooked up.... and I don't know if I can reproduce this, but I'll try.

Meanwhile, if anyone is interested, here's the layout of the tiny PCB that I designed and etched. This is before etching. You can see how crude it is, with the traces just drawn on with an ordinary Sharpie marker. (I had to add a couple of holes and traces on the image that weren't there when I took the photos, like for the 100 uF cap which I decided to put on the board.)
I did the surface topside layout first, then I drilled the #60 holes, then I sketched in the traces on the copper side "connecting the dots". Warm Ferric Chloride etchant, about 10 minutes of agitation in a plastic tub, cleanup with water and acetone, and Bob's yer uncle.