How to ... transform DC to AC?

[Groundloop]

@TiLeeTY,

The attached circuit will give you what you want. Just remember to drive the input part from
a separate power supply than the mosfet switch part at right in the drawing. If you run
the +DCV from 12 volt then you will get 12 volt AC (square pulses) output. This circuit
can drive coils and transformers (inductive load) if you want to. The oscillator input can
be from a function generator or a 555 oscillator circuit. The 555 IC should be a type
that can handle 12 volt DC so that you get 12 volt pulses to the input of the bridge.

If you need a circuit drawing for a 556 IC oscillator with frequency and duty cycle control,
then let me know and I will post a drawing here.

You can use almost any type of mosfet transistors of the N-Type on the switching part.
Just make sure your mosfets will take the voltage and current you plan to use on the switch.

GL.

[Rafael Ti]

Or... you can try something easy to do first . In here the output AC is square or even triangle due to use of C4, but you stated you don't need a sine. Its level depends directly on supply voltage, which is your input voltage. Transistors can carry up to 6 Amps, so you better put a 5A or less fuse on output and that will be the max. current you can get. This setup originally drives a transformer with single primary winding.

[gyulasun]

Hi UTiLeeTY,

I have made a schematic from the link I gave you above, including the second transformer I wrote.  Of course you have to know a single transformer with just the correct number of turns on its output side is the preferred solution but you have to wind it I am afraid.

The BD699 type (Darlington) shown in the original circuit is not easy to find but you can use a TIP3055 type (no real need for Darlington type) or similar NPN power transsistors with 70V or higher collector voltage and 7 - 8A or higher collector current ratings. 

Now you have some choices to build...   lol

Good luck,
Gyula

[Groundloop]

@TiLeeTY,

The attached 556 oscillator gives you control of both frequency and duty cycle.

GL.

[Groundloop]

Hi UTiLeeTY,

I have made a schematic from the link I gave you above, including the second transformer I wrote.  Of course you have to know a single transformer with just the correct number of turns on its output side is the preferred solution but you have to wind it I am afraid.

The BD699 type (Darlington) shown in the original circuit is not easy to find but you can use a TIP3055 type (no real need for Darlington type) or similar NPN power transsistors with 70V or higher collector voltage and 7 - 8A or higher collector current ratings. 

Now you have some choices to build...   lol

Good luck,
Gyula

@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.