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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 18th February 2018, 12:03 PM   #2571
fred sonnen is offline fred sonnen  Germany
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I will put the dam1121 DAC and the DCG03 in one case. As USB is my only source and the DCG3 seams to be a good output stage ( as a headphone and Pre Amplifier) I think it is a good idea (?).
Regard the volume control:
The idea is to manage that within the DAC. I think the volume control within the dam1121 didn't touch the audio data itself, so is bit perfect.

Are my ideas comprehensible and, above all, correct?
If so what to do with the DCG03? Is it a good idea to leave the DCG3 always full throttle?
Or is it better to reduce the DCG03 volume at a fixed certain level?
If yes, how?

greetings
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Old 18th February 2018, 02:18 PM   #2572
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Definitely doable to combine some DAC and digital control in the same box with this amp and result in a noise free whole. You wouldn't have to do something special regarding the DCG3 itself. Has been done by some members before but maybe the most characteristic and compact example has been demonstrated by Croatian member yoke. More box space to easier dissipate the Class A heat is a good idea nonetheless. Its not made of butter of course and its Panasonic caps are 105C but cooler is better for long term peace of mind. See posts #1937,1938,1946,1949,2035,2200.

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Old 18th February 2018, 03:36 PM   #2573
rhythmsandy is offline rhythmsandy
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salas how to make this pre unity gain stable? it tends to oscillate when gain is reduced to 1. I want to use it like an opamp stage.
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Old 18th February 2018, 03:54 PM   #2574
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
It says in the pdf instructions it can't be set to unity gain. Wasn't its purpose at all. Although at times two its still robust. Maybe there is some way to modify its blocks or over-compensate its open loop gain curve to achieve buffer mode stability but it will not be much the same circuit anymore. I haven't tried that anyway.
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Old 18th February 2018, 06:02 PM   #2575
beardman is offline beardman  Denmark
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could not wait,,i have just mounted the BC327

Sound,,not the big change...but i seems that it plays more polite,,maybe missing some clearness and attack

not sure what i vil do..maybe back to BC560,,,will play some days

hope others will try the same change
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Old 18th February 2018, 06:13 PM   #2576
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Little more 2ndH is possible due to less HFE and 8% less open loop gain than with the BC560C (especially the one from the kit which is very high HFE). But also less noise that maybe its not an immediately audible change since the preamp wasn't noisy before. If you go near your tweeters can you hear bit less system hiss? Anyways let it play for some hours or more and if no extra detail comes through due to bit more quiet, then no reason to stay with this test type if it will not eventually open up.
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Old 18th February 2018, 06:25 PM   #2577
beardman is offline beardman  Denmark
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could be a little more 2ndh..give normally more polite sound,,,not sure about the noise

will try to listen do this..

i will use it for some days,,with different kind of music
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Old 18th February 2018, 06:36 PM   #2578
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Also in the end note down its little contribution characteristic because it may marry best with some different op-amp you will roll later on. Keeping notes is essential when exploring parts variations.
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Old 18th February 2018, 06:47 PM   #2579
beardman is offline beardman  Denmark
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hope to get my opamp in a few days,,,will now wait and try to roll them first with the BC327

this is the fun part
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Old 19th February 2018, 03:15 PM   #2580
beardman is offline beardman  Denmark
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now i am back on BC560,, plays better more life

,BC327 is a bit boring

next step opamp rolling
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