samy555
Member
**broken link removed**
My questions are:
1- Why the 12V zener?
2- If i replace the IRF740 MOSFET by any 400v/10A BJT transistor, what would happen?
note: I know how to connect the BJT.
3- why C2 is only 10uF dislike C1?
4- from:
https://avecircuits.blogspot.com/2012/07/0-300v-variable-high-voltage-power.html#.UI3WD2dQaoY
I found a similar circuit:
**broken link removed**
Author said:
thank you alot.
My questions are:
1- Why the 12V zener?
2- If i replace the IRF740 MOSFET by any 400v/10A BJT transistor, what would happen?
note: I know how to connect the BJT.
3- why C2 is only 10uF dislike C1?
4- from:
https://avecircuits.blogspot.com/2012/07/0-300v-variable-high-voltage-power.html#.UI3WD2dQaoY
I found a similar circuit:
**broken link removed**
Author said:
How R3 value depends on HFE?The degree of R3 gets from testing in this circuit, which depending on the gain of the transistor or the hFE value, so you may need to tune the value of R2
thank you alot.