Johnny Aum Oscillator Led Light Circuit

[ewizard]

Skywatcher - that's impressive.

Just a question on what "gutted LED filament" bulb is? Is that the LED bulbs that look like a tungsten filament bulb but are actually LED? If so what was done to make them 'gutted' ?

[SkyWatcher]

Hi ewizard, actually, with this circuit, i am seeing more light from the non-modified 6 watt ecosmart led bulb.
Though yes, the gutted led filament looks like a tugsten filament, but for some reason, the non-modified regular led bulb is throwing more light out.
peace love light

[SkyWatcher]

Hi all, i picked up a pack of ikea, 5.5 watt led bulbs today, it didn't perform well with the circuitry inside, so i bypassed it and removed the diffuser, it has 3 led dies inside and it really pumps out the light.
With 255 milliwatt input, the bulb is mounted high up at the ceiling and is blinding.
Camera is saturated, so it is hard to see how well it lights up the area.
peace love light

[SkyWatcher]

Hi all, so i have been testing different modified led bulbs and am having good results with a 2.8 watt ikea led bulb, with circuitry removed.
This bulb is rated at 200 lumens and my input with the johnny aum circuit is 258 milliwatts, with the 12 volt tractor battery or just over a 1/4 watt input.
What is interesting, is that if we calculate that input, that is 9.2% of full input power and the led bulb at that input, should only be outputting around 18.4 lumens.
I will tell you this, this light is outputting way more than that, at least 100 lumens or more for sure, i am blinded by the led's in all angles viewing them.
I also built a flashlight, using the same 2.8 watt ikea led bulb, modified and it runs off of 3 AA nimh cells in series and really cranks out the light in all directions, using 350 milliwatts, though the 12 volt, 258 milliwatt home light version, is just as bright in my opinion.
The 12 volt, home light version, has slightly different circuit, i had to add a 90 ohm resistance on the line between the capacitor and NPN collector, to reduce the input and output to what i desired.
Here's a couple pics, the first one at the ceiling, is much brighter, but the camera closed off the iris for protection i guess.
The second pic, is the flashlight.
Any questions or comments are welcome.
peace love light

[Wistiti]

Nice work Sky!!
Have you try this other circuit of Jhonny Aum see in the pjkbook??

[SkyWatcher]

Hi wistiti, thanks for the reply.
Have not tried that particular circuit, though the meissner oscillator variant i built is similar.
Though will try the one you posted also, though i don't think that circuit is intended for high light output, like the one being tested now is, with the pnp-npn transistor combo.
Here is the updated circuit for the 12 volt home light in testing now.
peace love light

[SkyWatcher]

Hi all, i deleted last 2 messages, because i just realized that apparently, at least this particular 2.8 watt ikea bulb is using 12 volt led's inside.
It must also use a step down transformer circuit inside the bulb, of course that is removed, so that explains why the oscillator was not reacting to the ferrite core being removed.
peace love light

[SkyWatcher]

Johnny Aum Night Light

Hi all, here is a very efficient night light, using johnny aums oscillator with the 2.8 watt, ikea led bulb with circuitry removed, it has 12 volt leds inside.
It uses 3 lithium ion cells in parallel, taken from laptop, they are 4 volt cells.
If they are 2 amp hour cells, this night light should run at least 200 hours.
Input is 109 milliwatts or 4 volts at 27 milliamps.
peace love light

[Allen Burgess]

Magnet spinner

@SkyWatcher,

Very nice build. It occured to me that the circuit and coil should be able to power a magnet rotor too. Skycollection manages both with a nearly identical circuit and ferrite core bifilar spiral.

[SkyWatcher]

Hi allen, thanks for the reply.
Yes, skycollection does some great work.
I haven't got into the spiral coils much, it would probably take some practice, just to make a decent coil and with the ferrite included, would make it quite the challenge.
Though i bet it would make this setup even more efficient, no doubt.
peace love light

[Wistiti]

Hey Sky really nice work as usual!
It seems to output a real great amount of light!!! It is impressive for the input power... For sure i will give it a try when the time permit.
Does this transistor combination are the best you have found? I don't have these specific one under hand...

Thanks again for sharing your work
Take care!

[SkyWatcher]

Hi wistiti, thanks for the kind words.
It does output a good amount of light for 109 milliwatts, for sure.
The bathroom shown in the picture, one can use the mirror or do most of the normal things one would need to do, even better if it's mounted on ceiling or on wall.
I am using small transistors that i have salvaged from circuit boards, i'm using the PN4248, because i accidentally shorted the previous pnp transistor and it went poof.
Though most combinations will probably work well, i take some time to tune and tweak the circuit, to get best light output for lowest input, changing capacitor value, changing resistor value and sometimes, removing coil windings, if the frequency is too low.
I used 24awg. wire, because i wanted to keep the frequency higher, yet keep the input lower, which is why i used 4 layers.
I also used nylon zip ties, to clamp the c-cores tightly together.
I would imagine, a large enough ferrite toroid, may work just as well.
peace love light

[Wistiti]

Ok. Thanks for the info!
I Will try with what i already have under hand...
Just for Curiosity, does is have a rigning sound.?

[SkyWatcher]

Hi wistiti, no, it has no audible sound that i can hear.
Though, if i had used 4 layers of 30awg. wire, i'm sure the frequency would have been much lower and there would be ringing sound.
Changing capacitor and resistor values can only do so much, after that, either removing some windings or using a little thicker wire will push the frequency up higher, so it's not annoying.
peace love light

[SkyWatcher]

Hi all, Hi wistiti, just so you know, tuning this oscillator will take some patience and much tweaking probably, unless you get lucky and hit upon a good combination of parts.
Though you'll probably still have to tweak the capacitor and resistor to the input and light output you desire.
I'm making another oscillator and using a slightly smaller TV ferrite flyback core with 2 layers of 30awg. magnet wire, with BD135 NPN transistor and 2N2907 PNP transistor.
Though i am using a gutted 3 watt ikea led bulb, the led's inside this led bulb are 110 volt type.
I am getting about half the brightness so far at 120 milliwatts, compared to the night light.
And i have been tweaking the circuit for an hour.
The BD135 NPN transistor has far different specifications than the previous MJE13003 NPN transistor.
The MJE13003 is a high voltage type and meant for fast switching of inductive loads.
So that could be the cause of the difference or i need to add another layer of 30awg. wire.
I will try also 24 awg. wire again, 4 layers again and i can always remove some if needed.
It is also possible, the circuit parts prefer a lower input voltage for efficiency, compared to the 12 volt input i am testing.
I will keep trying though.
Just thought this information might be helpful to you.
peace love light

Edit: ok, a TIP3055 NPN and either a 2N2907 or PN4248 is working almost as well as the night light at the 12 volt input, so far, more tweaking to go.