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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 25th October 2018, 04:26 PM   #1231
Carl_Huff is offline Carl_Huff  United States
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Location: Bakersfield, CA
Quote:
Originally Posted by Hicoco View Post
Hi Carl,
I just saw that you did not send the Adjust Power Supply board but the Fixed Power supply PCB, but i do not understand because there are the label "ADJ PWR SUPPLY" printed on it, see pictures
The bubbles at the top are the rail voltage adjustment pots and the large bubble at the bottom is where you select input AC voltage. Once assembled you will have a premium grade series regulated adjustable power supply
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File Type: jpg PWR_SUPPLY.jpg (204.5 KB, 385 views)
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Old 25th October 2018, 04:38 PM   #1232
Hicoco is online now Hicoco  France
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
The bubbles at the top are the rail voltage adjustment pots and the large bubble at the bottom is where you select input AC voltage. Once assembled you will have a premium grade series regulated adjustable power supply

Yes i got this PCB, but unfortunately i got all my component for the other one.....i followed this adjust power supply schematic.
Could you post the new schematic and boom list thanks
Attached Images
File Type: jpg KAD_ADJ_PWR_SUPPLY_REVISED.jpg (102.2 KB, 391 views)
File Type: jpg KAD_ADJ_PWR_SUPPLY_SCHEMATIC_REVISED.jpg (149.7 KB, 389 views)
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Old 25th October 2018, 05:10 PM   #1233
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by Hicoco View Post
Yes i got this PCB, but unfortunately i got all my component for the other one.....i followed this adjust power supply schematic.
Could you post the new schematic and boom list thanks
Aah, okay. That is because per your request, we sent you our power supply PCB that easily adjusts from 120v to 230v inputs. The version that you were expecting does not support that easy change. In any case the good news is that they share many parts in common.

Here is the schematic and BOM for the power supply that we shipped you.
Attached Files
File Type: pdf SERIES_REGULATED_PWR_SUPPLY_SCHEMATIC.pdf (186.1 KB, 77 views)
File Type: pdf SERIES_REGULATED_PWR_SUPPLY_BOM_02.pdf (30.5 KB, 41 views)
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Old 25th October 2018, 05:41 PM   #1234
Rick G is offline Rick G  United States
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Doug Self Preamp from Linear Audio #5
Carl,
is it possible to 1 of this Regulated PWR Board.?
If so i would like to purchase 1.

Rick G
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Old 25th October 2018, 05:52 PM   #1235
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
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Quote:
Originally Posted by Rick G View Post
Carl,
is it possible to 1 of this Regulated PWR Board.?
If so i would like to purchase 1.

Rick G
Sure,

For people within the US we can do ...

1 PCB for $10 (including the cost to ship) or ...
3 PCB for $20 (including the cost to ship)

Simply message me should you want to proceed.

The cost of shipping would a bit higher for those outside the US but we try to keep that reasonable as well.
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Old 25th October 2018, 08:36 PM   #1236
diyralf is online now diyralf
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Quote:
Originally Posted by Carl_Huff View Post
Aah, okay. That is because per your request, we sent you our power supply PCB that easily adjusts from 120v to 230v inputs. The version that you were expecting does not support that easy change. In any case the good news is that they share many parts in common.

Here is the schematic and BOM for the power supply that we shipped you.

Be aware. These op amp supplies are not short circuit protected.
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Old 1st November 2018, 12:25 AM   #1237
DoubleIPA is offline DoubleIPA  New Zealand
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Default Standoff/riser question

I'm in the process of procuring a case for the Self preamp and was wondering what you all use for standoff's or risers?

Peter
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Old 1st November 2018, 06:48 PM   #1238
fvzeppelin is offline fvzeppelin  Germany
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I'd be interested in recommendations, too.
Quote:
Originally Posted by DoubleIPA View Post
I'm in the process of procuring a case for the Self preamp and was wondering what you all use for standoff's or risers?

Peter
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Old 1st November 2018, 07:03 PM   #1239
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by DoubleIPA View Post
I'm in the process of procuring a case for the Self preamp and was wondering what you all use for standoff's or risers?

Peter
I use the M3 threaded nylon hex standoffs. They can be purchased everywhere.

Ebay is an especially good source. Amazon works too.
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Old 1st November 2018, 07:54 PM   #1240
asuslover is offline asuslover  Romania
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Doug Self Preamp from Linear Audio #5
Which of these 2 power supplies has lower noise?
thanks
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