Pigtail Neons :)

[NickMu]

One clarification to my above reply:
If I recall it correctly older Neons used to draw less than 1mA from about 100 - 150 V supply which makes it about 100 – 150 mW per bulb in the worst case. I think that about 100K series limiting resistors were commonly used (the value of the resistor varies with the voltage). Depending on your input voltage to the converter you should draw 25 – 35 mA from 5V and 10 – 20 mA from 12V input. The estimated current draw includes generous losses in your system.

Regards,

Nick

[Art]

I just got my first scope which is why I'm doing it now.

I know it isn't right, so that's why on breadboard.
Also, I have a slightly different pair of transformers additional to what is in the picture.

Now don't laugh... it's still dual trace 25 MHz...

[Art]

Ok, I got it No heat from anything, but I'm not sure the 1N004 protection
diodes are working, I get a zap with my fingers across the backs of both of them.

It's hard to see with the video, but they are two channel software PWM,
the light is moving back and forth between the two neons.

I think the transformer primary in the original circuit was very low impedance.
It's a short on my continuity meter, it's so low. That would look bad for the MJE3055 output.

Still have to sort out this stray high voltage problem.

[Art]

pic:

[pedja089]

1N diode won't do much at higher frequency.
Try to find some UF diode, or some schottky 60V diode, 1A...
Edit:
Add a lot of decoupling capacitors(10nF,100nF)
I think that you didn't put diode right way.
It should be like this
http://i.stack.imgur.com/Oarz3.gif
You can try to put 1N4148, but it probably won't last long...

[Art]

I have used the diode like the second example on this page:
http://electronics.stackexchange.com...nsistor-switch
The first way actually prevented the neons lighting, no matter what polarity the diode across the primary.

I don't have anything other than rectifiers at the moment, but will see how I go tomorrow.

[pedja089]

Second example won't do anything to spikes, it just prevent transistor from negative voltage.
I think that mosfet would be best solution. Because it have zener diode between source and drain.
You can also make RCD clamp, like this
http://m.eet.com/media/1055546/C0541-Figure4.gif

[Art]

Second example won't do anything to spikes, it just prevent transistor from negative voltage.
I think that mosfet would be best solution. Because it have zener diode between source and drain.
You can also make RCD clamp, like this
http://m.eet.com/media/1055546/C0541-Figure4.gif

Will a P-Channel MOSFET directly replace the MJE3055?
http://www.jaycar.com.au/products_uploaded/ZT-2467.pdf

Note this schematic has no protection diodes at all.