How to ... transform DC to AC?

[gyulasun]

@gyulasun,

Here is a little improved circuit of what you posted. The two transformers will use up a lot of energy because
of losses in the transformers. Same goes for using npn power transistors. So I recommend using mosfets instead.

Regards,
GL.

Hi Groundloop,

Thank you for the modifications I fully agree with them!

Greetings,  Gyula

[UTiLeeTY]

Whoa! Thank you for awesome curcuits !

But, how could I manage to regulate 'AC impulses' from say ...
an AC generator coil, which then go into one of both transistors (say: NPN on & PNP off - positive, NPN off & PNP on - negative) and produce output voltage depending on "polarity" of outgoing FET?

Thank you for your time & curcuits .

UTiLeeTY 

[poynt99]

Whoa! Thank you for awesome curcuits !

But, how could I manage to regulate 'AC impulses' from say ...
an AC generator coil, which then go into one of both transistors (say: NPN on & PNP off - positive, NPN off & PNP on - negative) and produce output voltage depending on "polarity" of outgoing FET?

Thank you for your time & curcuits .

UTiLeeTY

Sounds like you will need to stabilize your input first, and you can do this by full wave rectifying and filtering (large capacitor) the fluctuating input. Then you'll have a more stable DC source to start with.

To now convert to AC, you can either do so using a cheap and dirty inverter, or have the DC source power a function generator that is run through an amplifier stage. It depends on how clean an AC voltage you want, and what frequency. With a function generator/amplifier, you have more flexibility in controlling the output amplitude, frequency, and type of wave form.

.99

[UTiLeeTY]

If you want be able to regulate or control the output voltage i suggest you use a microcontroller with PWM function you can control the output voltage.
but now i'm totally lost as to what you want to do so i'm out.

Hmm ... I just want to use a NPN and PNP transistors as switches, which do work one after another ...

A rectified (by diode) AC generator coil/s current should be my input on FET for turning on or off an available DC voltage (such as 12VDC from battery).

Like,   a) PNP is off, 2nd AC input is off & NPN, using 1st rectified AC input, is on
          b) same NPN do create positive (12VDC) pulse
          c) then NPN goes off (because of no 1st AC input) & now PNP goes active mode
              (because 2nd AC input is on)
          d) same PNP produces negative (12VDC) pulse
          e) go back to a) 

In theory, that should work well ... but how may I import that into a working circuit, please :S?

Best Regards,

UTiLeeTY

[Groundloop]

Hmm ... I just want to use a NPN and PNP transistors as switches, which do work one after another ...

A rectified (by diode) AC generator coil/s current should be my input on FET for turning on or off an available DC voltage (such as 12VDC from battery).

Like,   a) PNP is off, 2nd AC input is off & NPN, using 1st rectified AC input, is on
          b) same NPN do create positive (12VDC) pulse
          c) then NPN goes off (because of no 1st AC input) & now PNP goes active mode
              (because 2nd AC input is on)
          d) same PNP produces negative (12VDC) pulse
          e) go back to a) 

In theory, that should work well ... but how may I import that into a working circuit, please :S?

Best Regards,

UTiLeeTY

@UTiLeeTY,

Why don't you make a simple drawing on what you want to do?
A drawing says more than 1000 words. :-)

GL.