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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 4th March 2017, 01:59 PM   #661
Eldam is offline Eldam  France
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No as I don't know if Carl is ok for that to be public as it's the shematic of D Self PS ! But it's on the link or the given doc Carl given by PM.
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Old 4th March 2017, 02:04 PM   #662
scottjoplin is offline scottjoplin  Wales
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Yes, ok. Thanks
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Old 6th March 2017, 03:58 PM   #663
Carl_Huff is offline Carl_Huff  United States
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Sorry, but the power supply is not my IP to publish. The power supply is by Doug Self and can be found on page 530 of his book "Small Signal Audio Design". I invite you to buy his book. It's a good one!

Supplemental info was included in the zip file that I sent you when you purchased the PCBs

Click the image to open in full size.
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Last edited by Carl_Huff; 6th March 2017 at 04:02 PM.
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Old 6th March 2017, 04:07 PM   #664
scottjoplin is offline scottjoplin  Wales
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Hi Carl. Understood. I have it, and yes it's a good read, thanks
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Old 6th March 2017, 10:59 PM   #665
Eldam is offline Eldam  France
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Hi Carl,

what is the best choicde according to you for the decoupling caps of the main power supply pcb please: I have the two choices on the BOMs : MKT or ceramic ?
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Old 6th March 2017, 11:05 PM   #666
Variac is offline Variac  Costa Rica
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Doug Self Preamp from Linear Audio #5
Could someone tell me the dimensions of the circuit board? We may be making a preamp chassis and want it to fit the maximum number of pre amp designs.

Mark
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Old 6th March 2017, 11:09 PM   #667
scottjoplin is offline scottjoplin  Wales
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Dimensions are in post #2
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Old 7th March 2017, 03:18 AM   #668
ammel68 is offline ammel68  United States
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Quote:
Originally Posted by Variac View Post
Could someone tell me the dimensions of the circuit board? We may be making a preamp chassis and want it to fit the maximum number of pre amp designs.

Mark
From post 2, "The main PCB measures 260mm wide and 155mm deep."
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Old 7th March 2017, 04:57 AM   #669
Variac is offline Variac  Costa Rica
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Doug Self Preamp from Linear Audio #5
Thanx Guys
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Old 9th March 2017, 10:00 AM   #670
orreborre is offline orreborre  Sweden
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I just finished the power supply to this project, and when I test it unloaded i get different readings on the positive and negative rail.

I get +16.56 V DC and -16.91 V DC at the output. If if I measure directly on the secondarys I get 22.15 V AC on both.

Is it normal to have a difference like this on the positive/negative side or should I worry?

Thanks
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