High Voltage CFL Circuit

[nievesoliveras]

Thank you @xs-nrg

About the crystal. Is it this the way to do it?

Jesus

[XS-NRG]

Yep that's it, but i would replace the 4Mhz with a 20Mhz or at least the fastest it supports.
The capacitor values do change with frequency but there is a table in the microchip datasheet that tells you what value to use. 

But the micro itself also needs to know which crystal is used, so don't forget to put it in the software's configuration bit's / word.

http://melabs.com/support/config_defaults.htm

[nievesoliveras]

Yep that's it, but i would replace the 4Mhz with a 20Mhz or at least the fastest it supports.
The capacitor values do change with frequency but there is a table in the microchip datasheet that tells you what value to use. 

But the micro itself also needs to know which crystal is used, so don't forget to put it in the software's configuration bit's / word.

http://melabs.com/support/config_defaults.htm

I was reading  the 16f628a document and found that it has an internal oscillator.
Do you know how to activate that intosc with code?

Jesus

[nievesoliveras]

The picture shows the parts where the internal oscillator is addressed.

[XS-NRG]

You don't want to use that internal oscillator because it is RC based and it isn't as accurate as the Xtal driven microcontroller.

The internal osc is more for micro's that blink led's or drive LCD displays or something like that it is comapable to a 555 timer.

That is the reason i told you to use a crystal.
You can find alot of info in this book:
http://203.172.182.172/~chirayut/Picbasipro_30project.pdf

And there is also alot of info in the microcode PIC Basic PRO help topics.