Hi,
i'm bulding another phantom supply with zener and pass transistor to avoid using regulators, based on Bo's schematic (without V multiplier):
http://www.hansenaudio.se/API%20psu.jpg
It is for one channel preamp, ~63V into 470-1000uF input cap, 10kR into base of transistor with 51V/0,5V zener, bypassed to base with 10uF. Then 1kR and 100uF for some more filtering. 220uF and 200r ala Jensen will go to phantom switch.
It should give me slow enough rump up/down (~380ms, maybe needed with vintage transformers), enough filtering and very simple for p2p. I've built one similar, although with less filtering because trafo's Imax didn't allow more.
Any thoughts or remarks about it?
i'm bulding another phantom supply with zener and pass transistor to avoid using regulators, based on Bo's schematic (without V multiplier):
http://www.hansenaudio.se/API%20psu.jpg
It is for one channel preamp, ~63V into 470-1000uF input cap, 10kR into base of transistor with 51V/0,5V zener, bypassed to base with 10uF. Then 1kR and 100uF for some more filtering. 220uF and 200r ala Jensen will go to phantom switch.
It should give me slow enough rump up/down (~380ms, maybe needed with vintage transformers), enough filtering and very simple for p2p. I've built one similar, although with less filtering because trafo's Imax didn't allow more.
Any thoughts or remarks about it?
