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

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 7th September 2016, 09:12 PM   #31
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Here
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Old 7th September 2016, 09:19 PM   #32
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by evanc View Post
Any good/recommended source for the NEC parts?
Anything HK based with top seller badge will do
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Old 7th September 2016, 09:31 PM   #33
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
5.9mA IDSS slim one and 6.5mA IDSS fat one. At VDS=3V. Both elements in each traced out.
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Old 7th September 2016, 09:50 PM   #34
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
LSK389B metal can ~5.5mA @ 3V
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Old 7th September 2016, 09:56 PM   #35
buzzforb is offline buzzforb  United States
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Tea doing boards?
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Old 7th September 2016, 10:06 PM   #36
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
He has only got test ones to make his preamp for now. When it will be fully boxed up I will do final system overview so I reserve for possible practical layout changes.
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Old 7th September 2016, 10:37 PM   #37
buzzforb is offline buzzforb  United States
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Ok. I'll grab transistors and watch for now.
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Old 8th September 2016, 02:07 AM   #38
Tham is offline Tham  Malaysia
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Default My DCG3 Experience

Hi All, I am really grateful to Salas for including me as a beta tester for DCG3 project.

I started sometime early June when I received the schematic. With a lot of help (and patience) from Salas, I have managed to put together my working DCG3 prototype and has been tweaking/listening to it the last month.

Let me state upfront that this is my most eagerly anticipated DIY project. I set out to build it double mono, power it with V1.2 main rail and with LDR volumn control, the result is a great sounding and most satisfying preamp in my system.

Let me attempt to describe how it sounds (subjectively in the context of my all DIY system); compared to my last preamp which is based on a famous buffer stage/LDR attenuation/V1.2 psu, it sounded faster, equal to if not more transparent, has better resolution, more detailed, better tone and image density, and exhibit tight control when the music gets complicated.

I strongly recommend everyone here to try this out in your system.
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Old 8th September 2016, 02:47 AM   #39
Jay is offline Jay  Indonesia
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What is the purpose of the second hexfet (M2)?
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Old 8th September 2016, 03:36 AM   #40
pidesd is offline pidesd  Canada
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Quote:
Originally Posted by Jay View Post
What is the purpose of the second hexfet (M2)?
it's a cascode device, so that M1 sees a near constant drain-source voltage, to reduce distortion.

as to how it achieves that exactly is a bit beyond me though....

Last edited by pidesd; 8th September 2016 at 03:41 AM.
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