3v OU Flashlight

[TinselKoala]

Ok,  same circuit (TKLABS V1.4) with same components, now with much higher inductance on the E-core transformer.
I have one side 600mH, other side 100mH 

After some testing i found that the higher inductance coil should go to the inverter (W2)
This way the 1:6 ratio ensures an adequate input pulse for this inverter to produce a good output (gate) signal.

I get the following screenshot (to get the MOSFET activated i needed to raise the supply voltage to 4V (@ 100mA).

All signals compared to ground

CH1 (yellow) top of D1 diode
CH2 (blue)   pin 13
CH3 (purple) gate MOSFET (pin 12)
CH4 (green)  Drain MOSFET

Regards Itsu

Looking good... but look at the frequency!

Your very heavy inductances are causing the whole circuit to operate much more slowly than Akula's. In Akula's scopeshot and in my most recent ones, we are using 1 ms/horizontal division and the frequency of the sinus and oscillation bursts is around 280-310 Hz.

You are operating at about 20 Hz, with scope set to 20 ms/division!


Also note that within the oscillation bursts the embedded sinus goes to the zero baseline rather than following the  inverter's sinus. This is caused, I think, by the fact that you are providing "adequate" voltage of 4 V rather than just 3V to the circuit.

[MenofFather]

What is the part number of the chip?

HCF4049...

[itsu]

Looking good... but look at the frequency!

Your very heavy inductances are causing the whole circuit to operate much more slowly than Akula's. In Akula's scopeshot and in my most recent ones, we are using 1 ms/horizontal division and the frequency of the sinus and oscillation bursts is around 280-310 Hz.

You are operating at about 20 Hz, with scope set to 20 ms/division!


Also note that within the oscillation bursts the embedded sinus goes to the zero baseline rather than following the  inverter's sinus. This is caused, I think, by the fact that you are providing "adequate" voltage of 4 V rather than just 3V to the circuit.

Right, so lets see what happens when i decent to more normal (in this case) inductances by first lowering the inductance to
the initial reported 54/27 mH, then to 5.4/2.7 mH and finally to 170/300 uH as reported on page 1 of this thread.

For getting back to 3V supply voltage i probably need to use a transistor or a lower G/D voltage MOSFET.

Thanks,  regards Itsu 

[TinselKoala]

HCF4049...

The 4049 is a 16-pin inverting hex buffer. Pins 13 and 16 have no function and are not connected in the chip. It is a 14 pin chip in a 16 pin DIP package.

[Vortex1]

IMHO, the schematic from the Wesley video with the grayed areas and big X through the inverter is a less viable schematic than the schematic offered by verpies,  Vadik Guk and others. Is there really a good reason to use that schematic. What is the rationale?

The schematic I question has an FET or transistor and resistor doing little more than loading the supply and producing the sine wave ripple. This seems to be wasteful of input power.

Most of the other Akula schematics show the mixing of two frequencies in the transformer. I will pursue that approach.

I get a lot of interesting audible ferrite singing at certain settings of the 4069 frequency adjust pot.

Of course since no one has a runner, it is only an opinion, to each his own.

My build attached.