Hi,
I have this schematic... and I don't know how to fill the missing part.
The transformer is made on a small ferite toroid. It must be driven with 100Khz square wave (0-12V). This must be mede from a 0-5V square wave from a micocontroler. Any ideas on how to do this ?

 

Hi,
I have this schematic... and I don't know how to fill the missing part.
The transformer is made on a small ferite toroid. It must be driven with 100Khz square wave (0-12V). This must be mede from a 0-5V square wave from a micocontroler. Any ideas on how to do this ?

A push pull circuit will probably give the best results, a complementary pair of emitter followers might work out simpler than complementary MOSFETs. If the micro produces the pulses; you don't need an oscillator - but you need a level translator. A logic level small signal MOSFET should accomplish that by driving the complementary pair.

 

Like this ?

 

Isn't there anyone who wants to help me make this circuit working ?

 

Your post #3 circuit should provide the necessary 100kHz drive, but I suggest reducing R5 to 47Ω.
It might help us to help you if you post your .asc file.

 

Here is the .asc file and the models used.

 

I did something wrong ? Why nobody wants to help me ?
You ask for the .asc file. I put the .asc file but no one seems to care....

 

Can you please say what is not working?
Connect FGND1 & FGND2 to Ground itself, then it appears to be working.

 

Simulators do not like isolated circuits. Though this 1M resistors connected to gnd is the normal workaround, seems not ok here!

 

You ask for the .asc file. I put the .asc file but no one seems to care....

Can't open a .rar file.

 

Hello,

@Alec_t , The rar contains the following files:

I have uploaded the .asc , .asy and .sub for you.
The other files look standard to me.

Bertus

 

Can't open a .rar file.

It is very easy. Use winrar and it will be opened in less than a second.

 

Thanks for the files.
The sim runs ok for me if, as RamaD said, FGND1 and FGND2 are actually grounded (directly or via a resistor < 1meg).