Resonance Circuits and Resonance Systems

[Belfior]

Hmm if you check the circuit here

http://tinyurl.com/yar2enzh


Why doesn't the current going through collector&emitter stop the voltage on the gate? I thought collector&emitter conducting would stop the base from getting the voltage and then shut off?

[TinselKoala]

If you let your sim run for a while you 'll see that there is a small current flowing
from the capacitor, through the base and out the emitter of the transistor. This
is what is keeping the transistor turned on. I think you need a "pulldown"
resistor or other means to allow the base to go Low and turn the transistor off.

I think.



Also the huge long link has screwed up the forum page, so you need to scroll all the way to the
right to see the response buttons.

[Belfior]

If you let your sim run for a while you 'll see that there is a small current flowing
from the capacitor, through the base and out the emitter of the transistor. This
is what is keeping the transistor turned on. I think you need a "pulldown"
resistor or other means to allow the base to go Low and turn the transistor off.

I think.



Also the huge long link has screwed up the forum page, so you need to scroll all the way to the
right to see the response buttons.

Even the mosfet version fails http://tinyurl.com/y9sxb3df

sorry about the link. Using the tinyurl-conversion on the software now

[TinselKoala]

Too complicated and doesn't quite capture the concept.

Try this:

http://tinyurl.com/y7jgmrko

By the way... I can charge a cap to 15 times the supply voltage using only a relay and a diode. Figure this out and you'll catch the concept.

[Belfior]

Hmm ok so difference to my mosfet circuit was that you have no resistors. Gotta check this out in the real world. Thx!

I wonder if you can do this with the coils resonant freq and if that gives you a boost?