Voltage regulators for line level circuits

[HarryHaller]

From 1995:

[HarryHaller]

Positive voltage version.

[HarryHaller]

Fet and bipolar

[HarryHaller]

Fet and bipolar

[HarryHaller]

Both polarities

[Nicke]

Here you can find some improvements to the pooge regulator:
Reducing noise in voltage regulators

Harry,how do these compare to the latest regulators(the superregulator with a floating preregulator) from Walt Jung ?
I have them in my preamp and I can´t find any noise or ripple at the output(at least not with my oscilloscope).

Nicke

[HarryHaller]

From Audio Electronics 4/2000

Probably cool if op amps are your thing. The remote sense puts wire and/or PC trace resistance inside feedback loop for lower impedance at the load. Good idea for all transistor regulator too.

[carlmart]

Harry,


If you go here you will find a clean drawing of both + and - regulators, plus the preregulator.

Improved LM317 ?

It was downloaded 189 times as I just saw.


Carlos

[ALW]

Nice collection to play with.

For Nicke,

I'm currently awaiting some professionally produced PCB's for the updated Jung reg's (with the tracking pre-reg).

I've built about 10 units as prototypes and they are fantastic, transforming everything they've been used with, from preamp supplies to portable MD units.

The differences between the circuits are interesting. The op-amp based units all offer lower output impedance, owing to the large small-signal gains available. The downside is that op-amp compensation being what it is open-loop BW drops with frequency, hence impedance at the reg o/p rises.

The discrete circuits have the potential to offer much wider OL BW, the POOGE one, for example offers flat o/p impedance to >100kHz.

This can, subjectively, be preferable in certain applications (primarily where noise is not the major concern) as it gives a neutral sound. Impedance is nearly always higher in these designs though, without some exceptional amplifier design.

Newer op-amps offer some hope here (Ad817 / AD825) offering much wider OL BW (to approx 10kHz). It's again at the expense of impedance and noise.

The other thing to bear in mind, as Walt mentions in his 2k update, the low-noise non-degenerated front ends of units like the AD797 can easily be driven into non-linearity in certain applications (notably digital designs with high levels of HF noise). As always careful selection for application is beneficial.

For my 0.02, the op-amp suppplies are marvellous for limited supply voltages, offering the lowest noise, low o/p impedance and stunning line rejections, discrete is the only option at higher V for power amps etc.
I recommend everyone to try the POOGE (with my updates) as it's easy to trial using prototype board (or even HH's beloved p2p!) and is such an order of magnitude better sounding than a 3-terminal reg. They're stable, cheap and fun!

Andy.

[Peter Daniel]

Originally posted by ALW

I recommend everyone to try the POOGE (with my updates) as it's easy to trial using prototype board (or even HH's beloved p2p!) and is such an order of magnitude better sounding than a 3-terminal reg. They're stable, cheap and fun!

Andy.

Are they much better sounding than LT1085 types?
I'm asking because I'm still looking for good regulators for my CD Pro 2 project. I'm almost settled on LT1085, but still hoping to find something better.