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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 30th September 2015, 03:42 AM   #1
Carl_Huff is offline Carl_Huff  United States
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Default Doug Self Preamp from Linear Audio #5

As promised here is a PCB and construction thread for the preamplifier as designed by Doug Self and published by Jan Didden in Linear Audio issue #5. Both gentlemen have graciously agreed to offer their support to guarantee success of this thread.

This preamplifier is especially interesting in that it includes what Doug describes as a 'comprehensive tone control', that means that both the gain and frequency hinge points for the HIs and LOs are continuously user adjustable.

For the last month I've been using this preamplifer listening to a variety of music and sources. Now that I have gotten used to having comprehensive tone controls at my fingertips I would miss them immensely if they were to disappear!

Another quality of Doug's creation is that it's quiet, so quiet that I have given up attempting to measure it's noise level with my aging AP Portable One test set. Noise level at the outputs is at or near the noise threshold of my test set.

Assuming there is sufficient interest I will offer up a kit of parts for builders amounting to the required IO and main PCBs, 6 potentiometers, 4 PCB mount RCA phono connectors, BOM and a PDF reprint of the Linear Audio article.

The cost for a 2 channel kit will be $50 plus actual cost to ship. Private message me for details if you are interested.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

** NOTE that the latest project BOMs are here ...

The latest PREAMP BOM:
Dropbox - DSelf_PREAMP_BOM_v13_02.zip

The latest Front Panel Express files:
Dropbox - FRONT_PANEL_EXPRESS.zip
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Carl Huff

Last edited by Carl_Huff; 24th August 2017 at 11:53 PM.
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Old 30th September 2015, 04:01 AM   #2
Carl_Huff is offline Carl_Huff  United States
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The IO PCB measures 260mm wide and 38mm deep.

Note the addition of RCA phono connectors and delay ON circuit that was not in the published article. The IO was purposely separated from the main PCB so as to allow users freedom choosing a chassis for the project and to allow the further development of IO greater than the single pair shown here.

Click the image to open in full size.

The main PCB measures 260mm wide and 155mm deep.

Click the image to open in full size.
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Old 30th September 2015, 11:41 AM   #3
Halauhula is offline Halauhula  United States
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I am ready: where do I send the check!!!!
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Old 30th September 2015, 08:10 PM   #4
forr is offline forr  France
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It looks very nice. I may be interested.
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Old 30th September 2015, 08:26 PM   #5
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by forr View Post
It looks very nice. I may be interested.
For those of you that are interested in this project and want to read the article written by Doug Self as published in Linear Audio magazine ...

Jan Didden has arranged for an inexpensive download where it can be purchased here ...
Linear Audio | your tech audio resource
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Last edited by Carl_Huff; 30th September 2015 at 08:43 PM. Reason: Argh ... typos!
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Old 1st October 2015, 04:50 AM   #6
Carl_Huff is offline Carl_Huff  United States
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Here is a PIC of what I propose to be the front panel layout. The 'gold colored' circles are 15mm diameter control knobs.

Note the centrally located toggle switch that when operated to the down position bypasses the tone controls.

Click the image to open in full size.
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Last edited by Carl_Huff; 1st October 2015 at 04:54 AM.
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Old 1st October 2015, 12:19 PM   #7
hfxrzw is offline hfxrzw  Netherlands
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Carl, good one, I'd be happy to take two sets from you! Thanks, Rene
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Old 1st October 2015, 04:30 PM   #8
Carl_Huff is offline Carl_Huff  United States
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Great!

Let's start a group buy list. I'll leave it up for 30 days or so. Expect delivery to be mid to late November

georgebrooke - 1kit
Halauhula - 1 kit
hfxrzw - 2 kits
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Last edited by Carl_Huff; 1st October 2015 at 04:37 PM.
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Old 1st October 2015, 08:26 PM   #9
georgebrooke is offline georgebrooke  United Kingdom
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Default Self Preamp

Thanks Carl.

I am really looking forward to building this unit. At the moment the only additions I plan for the front panel are an on/off and an input selector. There is plenty of room on the layout in a standard chassis so it seems all systems are go.
Congratulations

George
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Old 1st October 2015, 08:37 PM   #10
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by georgebrooke View Post
Thanks Carl.

I am really looking forward to building this unit. At the moment the only additions I plan for the front panel are an on/off and an input selector. There is plenty of room on the layout in a standard chassis so it seems all systems are go.
Congratulations

George
How many inputs are you looking for George?
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