3v OU Flashlight

[semenihin-77]

I know, right?
Anyway, I am re-building the circuit again. At some stage the voltage increased even further and the coil started 'dancing' around the table. Then (with a big spark) both LEDs, MC34063, and a couple of capacitors gone up in smoke.
BTW, the power supply is limiting the current to 100 mA max so all that power didn't come from the PSU.

~A

Все верно, у меня сгорал диод максимум Вся "соль" чтоб найти консенсус между напряжением емкостью всех конденсаторов и частотой. Если нагрузка постоянная то добивайтесь понижения потребления подбирая частоту резонанса, когда вы будете очень близко- ток будет прыгать от - до +, задача найти баланс, очень тонкий баланс.

Сейчас я ищу резонанс по току, резонансная катушка имеет мало количество витков, а конденсатор больше емкость.
В любом случае вы поняли что надо найти, мои поздравления!

All right, I burned the diode maximum All the "salt" to find a consensus between the voltage capacity of all capacitors and frequency. If the load is constant for lowering consumption picking up the resonance frequency when you are very close, the current will jump from - to +, the task to find a balance, a very delicate balance.

Now I'm looking for current resonance, has little resonance coil number of turns, and large capacitors.
In any case, you realize that it is necessary to find, congratulations!

[verpies]

The schematic is on the page 5 of the Onsemi datasheet. The only difference is that I use a variable resistor on the feedback (22K) and there is the secondary coil.

...and the secondary coil is connected to this circuitry ?
How was the transformer constructed?  Any copper tape shields?

[Vortex1]

...and the secondary coil is connected to this circuitry ?
How was the transformer constructed?  Any copper tape shields?

I'm gonna guess the secondary was open circuit. Very high voltage rise is possible on this winding if it resonates with inter layer winding capacitance and the resonant frequency of the winding is hit. But voltage alone is not power, there is no mention of a load.

If the voltage divider R1 and R2 from the data sheet p5 were replaced with a pot (as he says it was) without a limiting resistor, the boost voltage could have gone very high, well above the 28 volts for the given values when the pot was turned close to ground. Exceeding 40 volts would put the chip into "who knows what operation" before it self destructed.

A properly sized resistor must be put in the ground leg of the pot to insure over voltage does not occur.

[avalon]

Just for the record...
I am not looking for power output from this circuit. In fact, I could not care less.
All I want is to go to the bottom of this and find out exactly what makes it 'tick'.

We all know by now that it is some kind of resonance. However, I want to know more. I want to know exactly which one. Then and only then will I be able to construct a power generating circuit reliably.

The coils that I am using do not have copper shields. After winding and re-winding coils about zillion times I have concluded that the shields are not necessary. Neither are the air gaps in cores. Those exist for are for a specific reason only: fine-tuning the inductance in order to achieve the desired resonance.

The problem still remains of how to determine the resonant frequency of the core. (Yes, I have tried all known methods and still not happy about them).

~A

[stupify12]

The only reason that makes it 'tick' is on how you wound your coils. Nothing more, nothing less. It is on the winding direction and winding position that the Inductance are easily destroy or nullified. Just examine how is your coils wound. A picture to post here wound be greatly appreciated with everyone.

Just take a lot of pictures on how you build and wound your Coils that all. It will work better if it is coreless + HF, but if we say low Frequency then you will need the Core to boost the Magnetics.

All others needed to know is how you wound your coils. The correct and exact direction and size, Just the Coils dude nothing more. Meow

Meow   

Just for the record...
I am not looking for power output from this circuit. In fact, I could not care less.
All I want is to go to the bottom of this and find out exactly what makes it 'tick'.

We all know by now that it is some kind of resonance. However, I want to know more. I want to know exactly which one. Then and only then will I be able to construct a power generating circuit reliably.

The coils that I am using do not have copper shields. After winding and re-winding coils about zillion times I have concluded that the shields are not necessary. Neither are the air gaps in cores. Those exist for are for a specific reason only: fine-tuning the inductance in order to achieve the desired resonance.

The problem still remains of how to determine the resonant frequency of the core. (Yes, I have tried all known methods and still not happy about them).

~A