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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 5th October 2017, 06:36 PM   #2161
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Marra View Post
The PF5102 is in the power supply and the BF256 in the preamp circuit.

Salas beat me to it.
Hi, how is it going? Did you manage to fix your lead wire broken Leak orthodynamic cans meantime or got something else to replace them by now?
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Old 5th October 2017, 06:53 PM   #2162
Marra is offline Marra  United Kingdom
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Salas DCG3 preamp (line & headphone)
I have managed to repair them yet.

Although not my Beyerthday until next week a box arrived from Amazon and I have been allowed to unpack and have a listen to the DT150's which I think I am going to enjoy listening to. Thank very much for the advice.
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Old 5th October 2017, 09:47 PM   #2163
Salas is offline Salas  Greece
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They are very clean for cheap closed back dynamics aren't they? Beyond being good in music, I was surprised on how much preferable I found them in watching movies vs my HD600s. Because they have the closed back oomph advantage for following the heavy cinematic FX better but without being characteristically closed cups resonance muddy they manage a very decent stage with sense of depth. The dialogue is always very distinct. Most closed backs are V shaped in response but this one isn't. It needs some initial play time to soften up the cushions and remembering to adjust so they touch and seal well especially below and behind the ear because they are long cups.
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Old 6th October 2017, 12:36 AM   #2164
Algar_emi is offline Algar_emi  Canada
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Salas DCG3 preamp (line & headphone)
For the quick THD measurment I used my trusty Keithley model 2015-P, Audio Analyzer Multimeter & Generator. Indeed it is THD + noise. Once it is assembled in the case, with the normal supply I'll check using my CLIO system.

What main fuse rating do you recommend for 120Vac main? I'm using two 50VA transfo with your dual mono supply, using 115ma BIAS.
Thanks
SB
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Old 6th October 2017, 12:46 AM   #2165
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
The Keithley must be true enough for one Volt RMS because if you look in my post #1 second picture FFT for 1kHz with 0.00041% THD it also shows the THD+N which is 0.0037% for half a Volt RMS.

I would recommend 2.5A AC inlet fuse to can take about 20A at 0.1 sec inrush with ease during the eye blinking power on time that the trafos build up magnetic momentum.

For Europe I would recommend 1.25A AC inlet fuse for same 100VA total.
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Old 6th October 2017, 01:31 AM   #2166
Algar_emi is offline Algar_emi  Canada
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Are they FB or SB type?

For the THD, don't forget I was testing with the lab power supply, not the actual one, we'll see with the completed unit. Almost done...

Thanks
SB
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Old 6th October 2017, 01:58 AM   #2167
Salas is offline Salas  Greece
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T (time type a.k.a. slow blow)
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Old 6th October 2017, 02:58 AM   #2168
ammel68 is offline ammel68  United States
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Salas View Post
The PF5102 is in the DCSTB because lower VDS there dictates lower VGS (OFF) and its noise is low. The BF256B is in the DCG3. They were like that from the start.
Yes, I meant PF5102 when used in the PS circuit.
Sorry for the confusion gentlemen.

Salas, thank you for the tip of using 5V for the test jig when testing '5102s for the PS.
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Old 6th October 2017, 03:43 AM   #2169
Salas is offline Salas  Greece
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You are welcome.
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Old 6th October 2017, 10:53 AM   #2170
r_jik45 is offline r_jik45  Japan
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Hi,

Was wondering which DAC could be integrated ahead (inside the chassis) of this pre-amp?

This one is likely 'too much': Assembled XMOS U8 + AK4495SEQ + AD827 DAC USB Decoder Board
What about something like that: ASSEMBLED PCM5102 DAC decoder I2S player 32bit 384K beyond es9023 or PCM1794 NEW ?
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