Joule Thief

[SkyWatcher123]

Hi folks, Hi gadget, think you may have forgot the capacitors that go in the circuit also, unless that does work without them, found the website you got that from, they call it a micro inverter.
That will be nice if the caps are not needed, though just put together the typical flip flop flasher using 4 leds in series per side for 12 volts, works well.
Will change the circuit now to what you posted and see if it will work, unless the transformer coil plays a role in the operation.
peace love light
tyson

edit: ok, it does work, kind of figured the coils capacitance would play a role in making it oscillate, cool.
Had to wire it up like a joule thief for it to work meaning, end of one strand connects to start of other.
using smaller PNP 2 amp transistors with this.

[gadgetmall]

Thank you Tyson. I am trying to replace that transformer with the rod  I think it can be done by adding another primary . I also might need an pnp transistor in place of one 2n3055 . I don't have a circuit simulator anymore so i will have to solder this up as it stands .

The crossing of my schematic need testing . i may have to flip the collectors connections to the primary centers and the pos rail to the outsides ..

[crowclaw]

  Crowclaw:
  Thank you for your comments.  Can you explain how to use the crt timebase scan output devices.
I just threw away an old working 15 inch crt monitor, but kept the main component board, and tube yoke for further experiments.  Can the crt monitor's  HF transistors be used in place of the 2n3055? The ones mounted on the aluminum heat sink or shield?

Check the data sheet first for pin out etc.   (www.alldatasheet.com) most of these devices work fine in place of your 2N3055. I have several older type TV scan output transistors from years back namely BU508D... The switching characteristics and peak voltage handling characteristics are better suited for high voltage HF work. Always use a decent heatsink of course just in case!

[crowclaw]

@gadgetmall

Yes a very simple multivibrator inverter circuit. The efficiency is not brilliant but it works ok, you need a decent  transformer however with a secondary winding capable of several amps for a useful primary output current. The output waveform is in fact a square wave, however the inductance of the primary output and load tends to round off the squareness of the output to crudely resemble AC. 
Showing your age gadget!! I remember vibrator packs too...noisey things while working, many of the early car radio's used them to provide the HT supply for then_ VALVES as we call them in the UK or TUBES in the States.

[Pirate88179]

All:

I can't tell you how great it is to me that the old JT topic is up and alive once again.  Like some others here, i was afraid that we had reached the limit of what this circuit can do but with the latest work by Gadget and Lasersaber and Nick and everyone else (sorry if i can't recall the names at this moment) I see it now going forward to levels we never even thought of in the old days.

Filament bulbs?  I remember xee2 lighting some 12 volt car type bulbs way back when..but they were dim, and now look what is going on.

I want to thank every one who has participated and is participating in this research.  You guys have all made my year once again.

Thank you,

Bill