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Old 23rd September 2012, 06:29 PM   #1221
Bemused is offline Bemused  United Kingdom
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Quote:
Originally Posted by Lorien View Post
Forgot about a question to all of you guys: I would need help in searching for a really good power supply for the oscillators which can be squeezed in a relative small PCB space (3.3V @ 100-200mA max)? I opted for Salas but he does not like the idea to have his design implemented in a commercial product so I respect his decision and move on. There's LP5900 approach (already used in WaveIO) but I feel that is something better out there...
Thank you,
L
PFM Flea is highly recommended and small footprint.
AD797 based linear regulator, flea by name and flea power by nature but can easy be fitted with pass transistors, its a very high bandwith regulator so attention needs to be paid to layout.
Contact is Martin Clark on pfm

Last edited by Bemused; 23rd September 2012 at 06:32 PM.
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Old 23rd September 2012, 07:47 PM   #1222
qusp is offline qusp  Australia
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Quote:
Originally Posted by Bemused View Post
PFM Flea is highly recommended and small footprint.
AD797 based linear regulator, flea by name and flea power by nature but can easy be fitted with pass transistors, its a very high bandwith regulator so attention needs to be paid to layout.
Contact is Martin Clark on pfm
its hardly needed to license the flea, its a well used concept thats hardly unique, its pretty much exactly what I already linked and recommended. so I think as long as you make some original parts choice and do your own layout, you are free to use it how you wish. I know of at least 3 datasheets for opamps and references that include a flea type regulator.

I mean no disrespect to Martin, its a good reg and quite suitable for this application, but I really dont see that permission is needed to do something along these lines ie. a filtered low noise voltage reference, feeding a low noise opamp, with or without pass transistor, or buffer to increase the current, as long as you dont just lift the layout and BOM.

Last edited by qusp; 23rd September 2012 at 07:55 PM.
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Old 23rd September 2012, 08:15 PM   #1223
Bemused is offline Bemused  United Kingdom
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qusp, you will likely find Martin only to well agrees with your above statement regarding the origins of the design.
I never said ask for permission by the way, just posted his name as originator of the 'pfm flea'.
My under standing is the flea is not a commercial product, it was put together to help us all.
Lorien asked for suggestions.
Did I do something wrong perhaps ?Regards
Tony
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Old 23rd September 2012, 08:19 PM   #1224
qusp is offline qusp  Australia
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sorry no, by including his details I presumed you were suggesting licensing it, which you would have to do only if using the layout. similar concepts have been around long before the flea, he was just the first to offer PCBs and link it with being a clock reg.

no you didnt do anything wrong, I misunderstood and I was also a touch confused at the suggestion of the flea specifically, when I already outlined in detail a similar circuit (with different modern parts) and a way to boost the current.
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Old 23rd September 2012, 08:34 PM   #1225
Bemused is offline Bemused  United Kingdom
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Originally Posted by qusp View Post
and I was also a touch confused at the suggestion of the flea specifically, when I already outlined in detail a similar circuit (with different modern parts) and a way to boost the current.
Yes in my speed reading big catch up of the thread I was paying attention to Lorien's post and too little attention to your post 1217

As you know I am not a regular poster here in DIYA, Ill get me coat
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Old 23rd September 2012, 08:48 PM   #1226
qusp is offline qusp  Australia
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what, you mean the one directly after Loriens request? hehe, no worries, dont mistake that line as being stern; thats just how I roll
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Old 23rd September 2012, 11:08 PM   #1227
bismuth is offline bismuth  France
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Hi,
As an alternative to the Flea, the Peranders's (member of this forum) regulator, named 'JSR-02' based on Jung reg with surface mount parts could also be a suggested base for a clock regulator. Salas regs are maybe more intended for feeding analog stages where audio bandwith only is concerned.
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Old 23rd September 2012, 11:20 PM   #1228
qusp is offline qusp  Australia
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when you can get such good performance with ~10 parts, a super regulator with at least 4 times that is complete overkill. we should really stop using the name flea, its kinda limiting anyway, theres a number of variations on the theme that would be useful here. Lorien did mention compact was desirable, but then he mentioned the salas reg =)
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Old 24th September 2012, 10:30 AM   #1229
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Old 24th September 2012, 05:39 PM   #1230
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i'm experiencing signal dropouts. it's most apparent with vocals and sounds like jittery distortion.

my usb cable is 6 feet long and i only have psu for isolated i2s. signal is fed to a 1543 module.

i don't remember experiencing this when i had the same psu hooked up to waveio ext. power instead and feeding the 1543 through direct i2s. (but then i was too busy marveling at the new sound)

i also can't seem to get it to work in linux after the psu swap- the card is recognized but no sound...

Last edited by PreSapian; 24th September 2012 at 05:42 PM.
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