Post by puffin on May 12, 2017 18:21:14 GMT
Some years ago I bought some TeddyReg and PowerReg boards in a PFM group buy. I used them with a linear power supply I made for a modded Sony PS1. The PS1 laser died and I put the regs into retirement.
I have lifted the following from the Acoustica website :-
"The TeddyReg is an ultra low noise regulator designed to be used in pre-amplifiers, CD players, DACs etc. Its advantages are very low noise, and excellent filtering of the mains and rectification noise. Since it has such a high filtering capability it allows connecting many regulators to the same power rail, avoiding the need of special or multiple transformers. In addition, it does not require large transformers and smoothing capacitors".
I bought a Muse NOS Minidac last year for £10 which I used a couple of times and retired it preferring what I was already using. I was using it with a 12v Li-on rechargeable battery. I dug it out again the other day and thought it sounded ok. I was also part of the Rock Grotto JLH Ripple Eater board GB about the same time. I had the Muse wired as follows...Battery...Ripple Eater....Muse. Sounded quite good. Then I added the TeddyReg, so Battery....TeddyReg...JLH...Dac.....Uh!.....a bit too much for the battery -Dac distorting (not enough amps). In goes a Linear 12v supply....TeddyReg.....JLH.....Muse. Stonking!
The JLH Ripple Eater :-
The JLH Power Supply Ripple Eater is an add-on circuit that sits between a power supply and end user. The Ripple Eater measurably reduces power supply output noise and ripple. JLH demonstrated a reduction in noise and ripple on his own bench supply from a figure, measured over the range of 20Hz to 20KHz, of 300uV to 4uV. When he connected a good quality 470uF electrolytic capacitor across the same bench power supply, there was no measurable improvement in ripple. In a similar experiment, the output noise from a selected 7815 IC voltage regulator was reduced from 60uV, itself better than the maker’s specification, to 3.5uV, when measured over the same bandwidth.
So is this all Electrickery as Catweazel used to say? (Geoffrey Bayldon died the other day by the way) Or do I really hear a benefit?
I have lifted the following from the Acoustica website :-
"The TeddyReg is an ultra low noise regulator designed to be used in pre-amplifiers, CD players, DACs etc. Its advantages are very low noise, and excellent filtering of the mains and rectification noise. Since it has such a high filtering capability it allows connecting many regulators to the same power rail, avoiding the need of special or multiple transformers. In addition, it does not require large transformers and smoothing capacitors".
I bought a Muse NOS Minidac last year for £10 which I used a couple of times and retired it preferring what I was already using. I was using it with a 12v Li-on rechargeable battery. I dug it out again the other day and thought it sounded ok. I was also part of the Rock Grotto JLH Ripple Eater board GB about the same time. I had the Muse wired as follows...Battery...Ripple Eater....Muse. Sounded quite good. Then I added the TeddyReg, so Battery....TeddyReg...JLH...Dac.....Uh!.....a bit too much for the battery -Dac distorting (not enough amps). In goes a Linear 12v supply....TeddyReg.....JLH.....Muse. Stonking!
The JLH Ripple Eater :-
The JLH Power Supply Ripple Eater is an add-on circuit that sits between a power supply and end user. The Ripple Eater measurably reduces power supply output noise and ripple. JLH demonstrated a reduction in noise and ripple on his own bench supply from a figure, measured over the range of 20Hz to 20KHz, of 300uV to 4uV. When he connected a good quality 470uF electrolytic capacitor across the same bench power supply, there was no measurable improvement in ripple. In a similar experiment, the output noise from a selected 7815 IC voltage regulator was reduced from 60uV, itself better than the maker’s specification, to 3.5uV, when measured over the same bandwidth.
So is this all Electrickery as Catweazel used to say? (Geoffrey Bayldon died the other day by the way) Or do I really hear a benefit?
