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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 2nd December 2017, 10:37 AM   #2271
beardman is offline beardman  Denmark
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i will not be using the DCSTB supply...i have a supply from Newclassd

i will just use some smaller value,,,have other in same serie
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Old 2nd December 2017, 10:40 AM   #2272
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Its a good audio capacitors series and their 85C rating isn't a problem where they are located.
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Old 2nd December 2017, 10:48 AM   #2273
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Newclassd recommends 100uF also by the way

http://www.newclassd.com/tpi.pdf
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Old 2nd December 2017, 10:54 AM   #2274
beardman is offline beardman  Denmark
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yes ,i have forgot this from his paper

my supply is his UWB regulator,,because i like the sound from them..and the can deliver all the power i need
for now i must just wait to get the board,,will take some weeks
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Old 15th December 2017, 05:46 PM   #2275
lykkedk is offline lykkedk  Denmark
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Salas ...

Thank's for the preamp i build ~1 year ago

Still the best, and still playing everyday!

Nothing more, nothing less to say, thanks man

Rgds; Jesper.
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Old 15th December 2017, 09:39 PM   #2276
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Nice
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Old 16th December 2017, 07:17 AM   #2277
bambadoo is offline bambadoo  Norway
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Yes - it truly is a great piece of design and audio equipment.
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Old 22nd December 2017, 07:53 AM   #2278
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Algar_emi View Post
Hi Salas. So here the latest results for the noise floor. As suggested I took my measurement with volume at mid-course, net effect was to see a higher 60Hz component, but reduced higher harmonics. Input is grounded.

Red trace is with case fully enclosed, Green trace is with volume pot ground pins connected to frame through a 10R resistor, it is slightly lower, but still is the better result ever I had. Now the noise floor is at -97dBV, instead of -95dB when I started.

Compare to your own measurement, I can see your using a laptop, probably running on battery. My own CLIO card is inside a PC, its power supply running off an insulated power transformer, so it is probably collecting nasty RF noise that reflects into my measurements. It is still one of the best results I had so far with my test setup.

Thanks for the tip.
Another possibly good tip is try BC327-40 matched transistors in the mirror instead of the matched BC560Cs as they are lower noise pin compatible types with still high enough hfe. They can improve the preamp's input referred noise by 4nVrtHz theoretically. As much effect as adding substantial degeneration to the mirror but intrinsically so. They are bit slower on the other hand but not so much so as to risk stability I would think. Can they even offer more subjective detail because they are quieter? I don't know, I haven't done that replacement, I just simulated it.
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Old 15th January 2018, 01:22 AM   #2279
fredlock is offline fredlock  United States
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What kind of head phone 1/4 jack terminal you guys using? Is this good enough? NYS230 REAN / Neutrik | Mouser
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Old 15th January 2018, 01:45 AM   #2280
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
I used that one. Its reliable. Another popular kind is the red button pro one with the size and mounting of an XLR but its a bit of hard push to unlock.
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