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Joined 2009
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Member
Joined 2009
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Hi Pawel,
The 47p Capacitor and 22k is a zobel across the MOSFET. I have found that real life MOSFETs love to oscillate and the zobel helps prevent it. I didn't need it so much for the simulation but including it reminded me that I may want to include it in any real design just-in-case I experience problems later. I'm not convinced that I will use a MOSFET if I build this design, I may opt for a BJT instead simply because I am more familiar with designing and using BJTs rather than MOSFETs. I have both types of power transistor in my stock.
Hi Franz,
Yes, you are correct, in this incarnation there is no absolute voltage reference. It could be added of course, a simple zener could be used to hold the base of Q1 at the desired voltage.
The 47p Capacitor and 22k is a zobel across the MOSFET. I have found that real life MOSFETs love to oscillate and the zobel helps prevent it. I didn't need it so much for the simulation but including it reminded me that I may want to include it in any real design just-in-case I experience problems later. I'm not convinced that I will use a MOSFET if I build this design, I may opt for a BJT instead simply because I am more familiar with designing and using BJTs rather than MOSFETs. I have both types of power transistor in my stock.
Hi Franz,
Yes, you are correct, in this incarnation there is no absolute voltage reference. It could be added of course, a simple zener could be used to hold the base of Q1 at the desired voltage.
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