3v OU Flashlight

[verpies]

@Verpies, what do you see at Pin 12 of the hex inverter chip, the mosfet Gate? Can you take a scopeshot there?

I cannot because I did not build Akula's circuit.  The scopeshot is his.

[conico]

 I have an HCF4069 and IRFZ44 didn't switch . Tomorow I will take an CD4069 and an IRF520-540.
I believe you  didn't use the 100 ohm resistor and your irfz44 blown

[TinselKoala]

I cannot because I did not build Akula's circuit.  The scopeshot is his.

Ah, OK, sorry, I thought you had built it. I was just wondering what the mosfet Gate drive signal looked like coming out of the inverter stage.

[TinselKoala]

I really don't understand how the mosfet in this circuit is supposed to be switched. The inverter chip is only supplied with the 3 volts input power and the sine wave input is only a couple of volts p-p. How can the output of the inverter stage reach the 4.5 volt (approx) gate threshold voltage of a mosfet?

[Grumage]

I really don't understand how the mosfet in this circuit is supposed to be switched. The inverter chip is only supplied with the 3 volts input power and the sine wave input is only a couple of volts p-p. How can the output of the inverter stage reach the 4.5 volt (approx) gate threshold voltage of a mosfet?

Dear Tinsel Koala.

As we have become very aware that deliberate errors are commonplace, could it be a humble Bi polar transistor ?? 

Just a thought !!

Cheers Grum.