Joule thief that could light the whole house

[CG2016]

If a resistor is removed from the circuit, I have measured up to 250 volts, but I'm  not sure it would light a Euro style lamp. I have no access to 220 volt ac led bulbs, so i couldn't test them.
Disclaimer is: Different manufacturers bulbs will light differently at different voltages and frequencies, also some will light on dc  as well as ac.
Internal circuitry of each style bulb is different designs due to manufacturers trying not to infringe on each others patent protections.

[SkyWatcher123]

Hi folks, for anyone interested, i found his latest device circuit.
peace love light

[AlienGrey]

Hi folks, for anyone interested, i found his latest device circuit.
peace love light

Hi ! If it needs a huge heat sink then it must be wasting energy I wonder if changing the transistor to a mosfet and using a mosfet driver would help ?

Just a thought.

AG

[CG2016]

That's just a left over note from a previous version that was never removed .
What's interesting about the comments is people are trashing and trying to find fault with circuit before they even try it.  Very interesting.
If works as described. I haven't seen one this small, do as much. You can add extra lamps and the current draw doesnt increase. Been tweeking this circuit for two years. I'm happy with its operation. 12 volts @ 0.500 A (6 watts)  makes a great camping, survival, lets go sledding at 12am gizmo, string a wire with 10 bulbs down the slope and go. Continuous usage with one bulb gave useable light for over 18 hours from 4 zinc carbon , dollar store dry cells.
I would imagine you could use a small 7AH sla battery intermittently like normal usage and you would get survival light for a long time. You just have to disconnect the battery when you turn off the light instead of disconnecting the lamp because the circuit still draws current even without a load, because the oscillator is still running.

[CG2016]

There are a couple of notables.
Only dimmable led bulbs should be used
40-60w equivalent types
Not all bulbs perform equaly
Ive found philips slimline and the EcoSmart bulbs from the home depot store work the best.
Some sylvania, NO DOLLAR STORE BULBS unless you use the hv spike output.
Some Cree, some Feit
No GE stick lights.
Non dimmable bulbs usually strobe on and off.
You just have to buy them and try them.
The 2SD2081 transistor is simlar to a TO220 but it is ALL plastic except the leads. So I don't know why they designed it that way.