If I put my notes here, I might be able to find them again later!
Voltage Regulators for Line Level Audio. Part VI : The Jung Super Regulator
Posted 13th February 2014 at 05:21 AM by rjm
Updated 14th February 2014 at 11:52 AM by rjm (clean up)
Updated 14th February 2014 at 11:52 AM by rjm (clean up)
In the next part of the series, I'll be presenting various published regulator circuits.
Today we have the "Jung Super Regulator" (2000 version) on deck, thanks to Tangentsoft's excellent write-up.
In translating the circuit to LTSpice, I've made some concessions. While I have kept the protection diodes so as to be consistent with the original - even if they do nothing in this simulation - the op amp, transistors, voltage regulator and reference have been substituted with working equivalents from the LTSpice libraries. I've been approximate in the resistance and capacitance values, and tuned the circuit to output 10 V at 10 mA to keep in line with the previous circuits I've uploaded.
It works though, and, under simulation at least, it works extremely well. Putting it together in LTSpice gave me a new appreciation for just how much work and refinement went into its design. Now, its an open question whether such over-the-top performance is useful or not, but the only real concern is whether the extreme amount of feedback used to obtain this performance is a good idea or not. Maybe it's a free lunch, maybe it isn't. I haven't tried it so I can't comment.
The LTSpice circuit is attached. Feel free to play around. Note that the ratio of R9/R10 has to be carefully adjusted to bring the voltage drop after the pre-reg to more than 2 V above the final output, otherwise the circuit stops working.
Today we have the "Jung Super Regulator" (2000 version) on deck, thanks to Tangentsoft's excellent write-up.
In translating the circuit to LTSpice, I've made some concessions. While I have kept the protection diodes so as to be consistent with the original - even if they do nothing in this simulation - the op amp, transistors, voltage regulator and reference have been substituted with working equivalents from the LTSpice libraries. I've been approximate in the resistance and capacitance values, and tuned the circuit to output 10 V at 10 mA to keep in line with the previous circuits I've uploaded.
It works though, and, under simulation at least, it works extremely well. Putting it together in LTSpice gave me a new appreciation for just how much work and refinement went into its design. Now, its an open question whether such over-the-top performance is useful or not, but the only real concern is whether the extreme amount of feedback used to obtain this performance is a good idea or not. Maybe it's a free lunch, maybe it isn't. I haven't tried it so I can't comment.
The LTSpice circuit is attached. Feel free to play around. Note that the ratio of R9/R10 has to be carefully adjusted to bring the voltage drop after the pre-reg to more than 2 V above the final output, otherwise the circuit stops working.
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