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182.239.120.88
somebody tell me what is zero feedback voltage regulator ?
I do not see how it regulate voltage is no feedback to compare the reference voltage, say a zener
Thx in advance
Follow Ups:
Thanks all three of you
Looks like the term Zero Feedback Regulator in reality do not exist, but people simply call Regulator not having return path to compare the reference voltage as zero feedback Regulator, for instance TK stated an example using zener and transistor to form voltage regulator that people normally treat is as zero feedback voltage regulator
A VR tube in shunt doesn't appear to have feedback, but it does. The feedback is internal to the VR tube.
Maybe you're thinking about the difference between active series regulation vs. passive shunt regulation as shown above?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Eric,
The easiest is say you are regulating 5V and you have a 9V supply. Using a NPN transistor the collector goes to the 9V, a resistor to bias the Zener. At the base of the NPN is that resistor, zener and then zener to ground. But remember you will need something like a 5.7V zener because the emitter will eat ~0.7V. Usually bypass the zener with a small film cap like 0.1uF. Also some resistor to ground from the emitter and that bypassed as well. I think Guido Tent has some stuff up on TentLabs.com using resistors and stuff.
J. Gordon Rankin
I think an emitter follower with a Zener on the base would qualify.
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