I want to filter/regulate my B+ supply. I would like to use an “absolute” voltage reference, but I do not want to use a zener diode stack. My experience with high voltage zeners stacks doesn’t give me good feelings.
Instead, I want to use a MOSFET voltage follower (otherwise known as a “virtual capacitor” or “capacitor multiplier”). Typically, a voltage follower’s output is 4 volts less than the input voltage, but with the ripple removed.
If the ripple is more than 4 volts, then the “capacitor multiplier” doesn’t work. Therefore, I want a MOSFET follower that drops 10 or 15 volts.
Anyone have good ideas on using a MOSFET to filter the B+ supply?
Instead, I want to use a MOSFET voltage follower (otherwise known as a “virtual capacitor” or “capacitor multiplier”). Typically, a voltage follower’s output is 4 volts less than the input voltage, but with the ripple removed.
If the ripple is more than 4 volts, then the “capacitor multiplier” doesn’t work. Therefore, I want a MOSFET follower that drops 10 or 15 volts.
Anyone have good ideas on using a MOSFET to filter the B+ supply?
Pick up a copy of "The Art of Electronics" -- in the supply regulation section there is a MOSFET supply regulator which works quite well.
I adapted it for the MCUTracer here -- making it adjustable by driving the error amplifier with a DAC instead of a fixed voltage reference:
http://www.tech-diy.com/MCTracer_no_pix_files/HV_MCU_webversion.htm
I adapted it for the MCUTracer here -- making it adjustable by driving the error amplifier with a DAC instead of a fixed voltage reference:
http://www.tech-diy.com/MCTracer_no_pix_files/HV_MCU_webversion.htm
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