3v OU Flashlight

[magpwr]

How much power is your signal generator providing to the circuit?

You do know that the voltmeter on your power supply will read the voltage across the output terminals... regardless of whether the voltage is coming from the supply, or from the circuit, right?

So I think your PSU is set to provide the lower voltage, and when you have it hooked to the circuit, it's reading the higher voltage injected by the function generator, or stored in the capacitors. Or perhaps you have one of many different kinds of possible groundloops. Who really knows what is grounded to what, and what is connected together by the scope's ground leads and the PSU's negative output. In my laboratory, I know, and I can isolate the FG and the scope if necessary.

hi TinselKoala,

It looks like 1098hz square wave signal being fed into circuit which is switched by a transistor with it's own frequency for mini transformer and step up voltage to 8.9xvolts.
I am unable to spot ou for this one unless it is a "power amplifier" with a ? in my head yet again.

[semenihin-77]

Сами попробуйте, генератор управляет только ключом. Не оказывает влияние на схему и выход своим напряжением.
Держите резонанс и увидите много гармоник , выбирайте ту,  что дает больше амплитуды.

Try yourself, generator controls only key. No effect on the circuit and its output voltage.
Keep resonance and see a lot of harmonics, choose the one that gives more amplitude.

[avalon]

Сами попробуйте, генератор управляет только ключом. Не оказывает влияние на схему и выход своим напряжением.
Держите резонанс и увидите много гармоник , выбирайте ту,  что дает больше амплитуды.

Try yourself, generator controls only key. No effect on the circuit and its output voltage.
Keep resonance and see a lot of harmonics, choose the one that gives more amplitude.

Thank you.  Very kind of you.
I am definitely going to try this.
One last question re this setup. Have you tried different capacitor? How would the resulting voltage change outside of the resonance? In other words, how important is the LC resonance in the secondary coil vs ferrite resonance?

~A

[TinselKoala]

I just shot a video demonstrating the PSU reading the FG output voltage, it will be ready in a few minutes. Anything connected to the PSU's output terminals that provides a voltage will show up on the PSU's meter. If some capacitor in the circuit is charged, by the PSU or FG, to 8 volts, then the meter will read that voltage. When the circuit is disconnected, the PSU's meter reverts to showing the unit's set voltage.

Meanwhile, here's a video showing that a mosfet Gate capacitance does pass power from an AC or oscillating signal to the Drain and/or Source pins of the mosfet. IOW, your FG driving only the Gate of a mosfet can indeed be providing power to the circuit.


http://www.youtube.com/watch?v=PKF1r6vwUpI

ETA: You can insure that the FG does "not" pass any power to the circuit through the mosfet Gate by using an optoisolator. Curiously.... putting a Gate signal optoisolator into circuits like these often makes any "OU" effect go away, though. I wonder why that is.....

[semenihin-77]

Thank you.  Very kind of you.
I am definitely going to try this.
One last question re this setup. Have you tried different capacitor? How would the resulting voltage change outside of the resonance? In other words, how important is the LC resonance in the secondary coil vs ferrite resonance?

~A

Пробуйте любые, какие понравятся , работает на всех частотах. Главное максимум амплитуды выжать при базовом питании.


Try any of which like to work on all frequencies. Main squeeze the maximum amplitude at the basic nutrition.