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Old 15th October 2013, 03:52 PM   #71
maouna is offline maouna  Greece
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what are the benefits of using a shunt regulated psu in a preamplifier, over a series regulated one? Are there any improvements in sound?

my psu for preamp is based on lm317/lm337 regulators and im thinking of building the A-class Preamp PSU posted here by APEX.
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Old 15th October 2013, 04:35 PM   #72
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Quote:
Originally Posted by maouna View Post
what are the benefits of using a shunt regulated psu in a preamplifier, over a series regulated one? Are there any improvements in sound?

my psu for preamp is based on lm317/lm337 regulators and im thinking of building the A-class Preamp PSU posted here by APEX.
I'd say that the main benefit is that a shunt regulator can isolate A.C. load current to a localized loop area. In other words, it can minimize the A.C. current interaction between various circuit blocks which might stem from any shared primary power supply connections. This also applies to the A.C. current demanded from the power supply elements prior to the shunt regulator, making the ecurrent demand D.C.
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Old 15th October 2013, 05:16 PM   #73
maouna is offline maouna  Greece
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Mr Mile do you have PCB for these preamplifiers?
Attached Images
File Type: jpg APEX SB3.1 preamp.jpg (113.8 KB, 458 views)
File Type: jpg APEX SF1 preamp buffer.jpg (100.1 KB, 418 views)

Last edited by maouna; 15th October 2013 at 05:20 PM.
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Old 15th October 2013, 05:21 PM   #74
maouna is offline maouna  Greece
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Quote:
Originally Posted by Ken Newton View Post
I'd say that the main benefit is that a shunt regulator can isolate A.C. load current to a localized loop area. In other words, it can minimize the A.C. current interaction between various circuit blocks which might stem from any shared primary power supply connections. This also applies to the A.C. current demanded from the power supply elements prior to the shunt regulator, making the ecurrent demand D.C.
ok. i understand.thanks for answering.
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Old 15th October 2013, 10:58 PM   #75
mihailo is offline mihailo  Serbia
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My version. Not tested.
Look if there are Errors, so I can revise PCB.
Regards
Attached Files
File Type: pdf BJT preamp SB 3.1.pdf (36.5 KB, 108 views)
File Type: pdf BJT preamp PCB.pdf (19.4 KB, 74 views)
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Old 28th October 2013, 08:41 PM   #76
maouna is offline maouna  Greece
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Mr Mile,i want a 30V single rail PSU for a preamp so i made a new board based on your class A 2x24V PSU schematic but using the upper positive half.i also added a fuse on the board. do any part values have to be changed for 30V output? on a earlier post you stated that BF245 could be substituted with BF244, 2N3819, 2N3823. does it apply also to this class A PSU?
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File Type: jpg APEX 2x24V Aclass PSU.jpg (417.5 KB, 361 views)
File Type: jpg DSC_0018.jpg (388.0 KB, 327 views)
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Old 15th December 2013, 02:45 PM   #77
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Default apex psu

Sir apex any replacement for BF245 /BD242/BD241 this items not available here in my place pls.help. thanks and regards..merry Christmas sir apex..
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Old 15th December 2013, 04:00 PM   #78
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Originally Posted by desertstorm View Post
Sir apex any replacement for BF245 /BD242/BD241 this items not available here in my place pls.help. thanks and regards..merry Christmas sir apex..
Use 2SK246 and TIP31/TIP32
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Old 16th December 2013, 06:04 PM   #79
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thank you so much sir apex for your quick reply...regards and more power sir..
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Old 16th December 2013, 06:39 PM   #80
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Default APEX tone Control and X -over projects..

Sir Apex here is my on going projects...thanks and regards.
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