Stitos,

It is a short duration pulse (40uS for laser) but it is the pulse repetition frequency (0 to 100%) that varies. Obviously Art would be able to provide a better description but this is the type of signal that I see.

Tweakie.

Andrea,

Excellent work, as always, on your completed impact engraving unit, extremely professional. (hope you sell lots  )

Tweakie.

But the voltage and intensity of LPT1 is modified or not?


Thanks

Stitos,

Sorry my explanation was not very good, I will try again.

But the voltage and intensity of LPT1 is modified or not?

The voltage on the selected LPT1 pin (digital trigger) is, in my case, either 0V or 5V (off / on) It is pulsed for a duration of 40uS at a varying frequency which is dependent on the image depth and the axis feedrate.
This produces the equivalent to a variable duty cycle (similar in it's effect to 'Pulse Width Modulation') but it is essentially Pulse Repetition Frequency (PRF).

Hope this helps.

Tweakie.

This driver based in L298N.
Can it work? For impact engraving pluging.

how connect the signals?

Stitos,

As far as I can tell,

the electromagnet should be connected across outputs 'out-a' and 'out-b'.
'en1' (en-a) should be held high (10k to +5 Volts).
input would be on 'in-a' or 'in-b' (either one will do).
other inputs are unused.

Tweakie.

Hi Stitos,

This is the schematics that I use and works very well.

You can connect magnet on A1 and A2.

Thanks,
Andrea

--  I am sorry for my bad English, I hope I never say the wrong things  --

Hi Sitos,

And this is the link for the datasheet...

http://www.robotfactory.it/CncDatasheet/L6208.zip
http://www.robotfactory.it/CncDatasheet/AN1451.zip
http://www.robotfactory.it/CncDatasheet/AN1495.zip

If you want I give you the PCB design in Eagle.

Thanks,
Andrea

--  I am sorry for my bad English, I hope I never say the wrong things  --

Hi Sitos,

And this is the layout, connections and registration...

Thanks,
Andrea

--  I am sorry for my bad English, I hope I never say the wrong things  --

Hello,
Not work my driver,   ET SMMC V2.0    (L298N