power supply for a beresford dac
- cressy
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#1 power supply for a beresford dac
just musing with regards to the power supply in the squeezebox power supply thread, and seeing on fleaby that there seem to be plenty of expensive psu's for beresfords, i assume a variation on the one mi old man did for the sb could be done for the beresford im using with the apple tv?
im musing because this beresford has the passive mod done, and as it reduced the gain and im currently driving long cables, i was using the variable output. switching to the modded output the quality has taken a leap forward.
having heard mi old mans sb with the old psu (incedentally exactly the same variable output maplins switcher im using with the beresford) and with the new ugly-but-so-much-better psu i wondered if this was the first step towards better better better digital for me.
have any other beresford users on here tried any psu upgrades? googling seems to provide mixed views. id rather hear someones views whom i know tbh...........
im musing because this beresford has the passive mod done, and as it reduced the gain and im currently driving long cables, i was using the variable output. switching to the modded output the quality has taken a leap forward.
having heard mi old mans sb with the old psu (incedentally exactly the same variable output maplins switcher im using with the beresford) and with the new ugly-but-so-much-better psu i wondered if this was the first step towards better better better digital for me.
have any other beresford users on here tried any psu upgrades? googling seems to provide mixed views. id rather hear someones views whom i know tbh...........
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#2
I tried linear supplies on my Caimen but found the best improvement was to replace the 2 internal regs with something better and continue to use Stan's upgraded external SMPS. The linear supply on its own made little difference to my ears over the SMPS.
I made up these regulators with a cap multiplier (gyro) on the front end which seemed to work well, space is tight as you can see above...
I made up these regulators with a cap multiplier (gyro) on the front end which seemed to work well, space is tight as you can see above...
#3
Nice job there Neal, a VBE/gyro is a nice way to reduce the noise.
Ant, you only really get 60-sh db from a 3 legged reg so a second layer of filtering is often useful.
Andrew
Ant, you only really get 60-sh db from a 3 legged reg so a second layer of filtering is often useful.
Andrew
Analogue, the lost world that lies between 0 and 1.
#5
Ant, there are pre-built regulator replacements as well if you want to go that route:
http://www.hificollective.co.uk/compone ... d_reg.html
http://www.hificollective.co.uk/compone ... shunt.html
http://www.hificollective.co.uk/compone ... d_reg.html
http://www.hificollective.co.uk/compone ... shunt.html
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- Old Hand
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#6
Do you have a schematic of your improved 'gyro' regulators?Neal wrote:... but found the best improvement was to replace the 2 internal regs
TD-125/RB250/MC25FL & 'Snail' phono, NAS/SBT with CS4398 DAC, 41MP pre & MoFo Power, still messing with OBs.
#7
After some research the i found the value for the regs 12v reg and 5v reg.
Can anyone explain what the 12v and 5v feed.
At the moment i have bought a class d 12v voltage regulator. i will replace this today and feedback my results.
What effect will the the 5v reg change bring?
there is a niggle in the back of my head that changing both regs are not necessary with the Gator "direct out" board as it bypassess the op amp stage.
can anyone clarify this
Can anyone explain what the 12v and 5v feed.
At the moment i have bought a class d 12v voltage regulator. i will replace this today and feedback my results.
What effect will the the 5v reg change bring?
there is a niggle in the back of my head that changing both regs are not necessary with the Gator "direct out" board as it bypassess the op amp stage.
can anyone clarify this
Last edited by bostod on Sat Jan 28, 2012 2:27 pm, edited 3 times in total.
- Mike H
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#9
Just to be pendantic, a 'gyro' (gyrator) is a thing that simulates the behaviour of an inductor (so you don't have to use a real inductor, especially for large values).
If you had made a real gyro you'd have something whose impedance is frequency dependent, but which I don't think you have, it's a capacitor multiplier.
I only mention it 'cause of seeing frequent mentions of 'gyros' around here lately, but they're not true gyros, so far as I can tell.
<end of mini-rant>
I'll get my coat
If you had made a real gyro you'd have something whose impedance is frequency dependent, but which I don't think you have, it's a capacitor multiplier.
I only mention it 'cause of seeing frequent mentions of 'gyros' around here lately, but they're not true gyros, so far as I can tell.
<end of mini-rant>
I'll get my coat
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
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#10
I'll be gyrating tonight at the bike club dinner.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- colin.hepburn
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#11
This link maybe of help to diy voltage regulators
For CD supplys look in diy projects near bottom of page 317/337 regs
http://www.raylectronics.nl/index_en.html
For CD supplys look in diy projects near bottom of page 317/337 regs
http://www.raylectronics.nl/index_en.html
- Dave the bass
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#13
Ali Tait wrote:Mind your back!!pre65 wrote:I'll be gyrating tonight at the bike club dinner.
Our-Phil + half pint of Shandy Bass =
DTB
"The fat bourgeois and his doppelganger"
- Dave the bass
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#15
Was this.Mike H wrote:Dave the bass wrote:
Our-Phil + half pint of Shandy Bass =
DTB
DTB
"The fat bourgeois and his doppelganger"