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

Building a Douglas Self design preamp
Building a Douglas Self design preamp
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Old 27th December 2016, 12:41 PM   #11
Eldam is offline Eldam  France
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The Pope will have a Douglas Self pre... ! First time I see such a thing with a shipment ! I will ask your local post for the money back in your shoes !

Yes of course I will go back on the thread, as I bought the exact BOM (I had to wait for one month to have all the parts from Mousers because of that: wanted to have all the Yageos resistor and the 4 KP caps which were out of stock ! )

with the main genuine BOM cap of the powersupply, I will test also some brand new TDK, Panasonic, IC, BC, Nichicon, etc ... all from the same value in uF & voltage...

I will say what I prefer knowing all being subjective about cap and personal hifi ! But as I have a very clear and good resolution with both DAC/amp and speakers combos, and a more classic Yamaha Pre, it could be interressant indeed !
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Old 27th December 2016, 04:32 PM   #12
fernfrost is offline fernfrost  Sweden
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Originally Posted by Carl_Huff View Post
#3) I am using a MUSES 7230 chip for volume control under BeagleBone control.
Cool!

Did you compare with anyother chips? How do you find the distorsion levels your setup?
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Old 27th December 2016, 05:06 PM   #13
Carl_Huff is offline Carl_Huff  United States
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Originally Posted by fernfrost View Post
Cool!

Did you compare with anyother chips? How do you find the distortion levels your setup?
The distortion levels are very low. The noise and artifacts are well below what I can hear thru my Sennheiser HD 650 headphones. My aging AP Portable One struggles to find it. Once I have a design that is closer to final I'll probably make a visit to a friend of mine that has a test bench equipped with the latest AP test sets and see what shows then.

This is the first time that I've used the MUSES part. In the past I have used TI PGA23xx chips extensively. I find that they work best when preceded with a simple FET buffer. The times that I have done that the PGAs become transparent. I've never used the Cirrus Logic part. It's not that I have a bias or prejudice against it, I simply have never used it.
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Old 30th December 2016, 05:56 PM   #14
fernfrost is offline fernfrost  Sweden
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Originally Posted by Carl_Huff View Post
This is the first time that I've used the MUSES part. In the past I have used TI PGA23xx chips extensively. I find that they work best when preceded with a simple FET buffer
Thank you! Exactly the input I was hoping for

When putting digital volume control into you design, did you simply slip it in where the manual pot used to be or did you place it after the preamp-board?
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Old 30th December 2016, 07:52 PM   #15
Carl_Huff is offline Carl_Huff  United States
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Originally Posted by fernfrost View Post
Thank you! Exactly the input I was hoping for

When putting digital volume control into you design, did you simply slip it in where the manual pot used to be or did you place it after the preamp-board?
The MUSE volume control is currently wired previous to the tone control board. That guarantees no chance of level overload when applying EQ gain.
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Old 19th January 2017, 08:31 PM   #16
calpe is offline calpe  Gibraltar
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Join Date: Dec 2016
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Building a Douglas Self design preamp
Ive started on this Preamplifier too and would like some suggestions.
All components ar mounted, so now its a question of putting it all together.
Case to use?
How did you go about fitting the boards for the front and rear?
Cabling and connections?
help would be most appreciated
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Old 20th January 2017, 05:56 PM   #17
fernfrost is offline fernfrost  Sweden
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Originally Posted by calpe View Post
Ive started on this Preamplifier too and would like some suggestions.
All components ar mounted, so now its a question of putting it all together.
Well done! Would love to see some pictures

How did you solve eg C1 on the power supply board? It is supposed to be lead spacing 7,5 mm farnell number 1200728 but the suggested alternative 9750983 has 5 mm lead spacing. Where you able to fit the alternative or did you source the original from somewhere else?

Last edited by fernfrost; 20th January 2017 at 06:09 PM.
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Old 21st January 2017, 05:39 PM   #18
calpe is offline calpe  Gibraltar
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Building a Douglas Self design preamp
fernfrost, although C1,C3,C7,C9,C11,C13 are listed as 100nF 10% 100V, 7.5mm pitch, the equivalent type fits without any problem as the pcb has holes for 5 mm too
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Old 23rd January 2017, 12:15 PM   #19
fernfrost is offline fernfrost  Sweden
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Originally Posted by calpe View Post
fernfrost, although C1,C3,C7,C9,C11,C13 are listed as 100nF 10% 100V, 7.5mm pitch, the equivalent type fits without any problem as the pcb has holes for 5 mm too
That is very good!

Still waiting on my boards...
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Old 9th February 2017, 10:51 PM   #20
calpe is offline calpe  Gibraltar
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Building a Douglas Self design preamp
Just to offer if anyone is interested, i have spares available for the Preamplifier 2012. Spares such as resistors, capacitors, relays, i.c.'s, potentiometers etc etc.
Place your request here, prices will be promising
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