**broken link removed**
My questions are:
1- Why the 12V zener?
Answer: To Prevent Excessive Gat to Drain Voltage
2- If i replace the IRF740 MOSFET by any 400v/10A BJT transistor, what would happen?
note: I know how to connect the BJT.
Answer: Mosfetsare Voltage Controlled and More EFFICIENT than Transistors.
Transistors are CURRENT CONTROLLED and would require a Higher wattage Control and a Different value
3- why C2 is only 10uF dislike C1?
Answer: It is just for Stability, Noyt needed for Filtering out Ripple.
WEITHER you use a TRANSISTOR OR MOSFET, It Needs a
GOOD HEATSINK on it!
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?
thank you alot.