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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 11th February 2019, 05:50 AM   #3571
manniraj is offline manniraj  India
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One of my friends got the muses volume Control board from academy Audio and wanted to pair with his salas I-select input control and dcg3 preamp. Below is the image of the board for your reference. Now coming to the connections little confused especially with the ComL and ComR and below is the quote from Mr.Lenny of academy Audio inc.

The VCU board works exactly as a dual gang pot. ComL and ComR are the separate common terminals for the Left and Right channels respectively. D-GND is a digital ground ( a reference point for the muting relay control ). After each channel is wired using their own common terminal as a reference, all three common terminals shall be connected together and to the ground point of the power supply.

The Mute output is needed to control the muting relay, which eliminates unwanted noises associated with the power-up and power-down processes.


How to wire up from the output L/Gnd/R of the I select input board and the input and outputs of the dcg3 preamps? I could get the input and outputs L/R but the common input and output grounds is where the confusions starts. Can someone point me to the right wiring as well as how to use the mute feature.

Thanks
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Old 11th February 2019, 08:39 PM   #3572
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Member seanwu had used a mini board with Muses, not this same one though. He had shown pictures of his buid in post #1929.

LGND or RGND run on the same ground strip at the DCG3 anyway. Maybe just connect ComL ComR there and connect the D-GND at its PSU GND.
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Old 11th February 2019, 11:19 PM   #3573
savvas is offline savvas  Greece
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It is two different implementations of Muse chip, so wiring of one doesn't apply to the other.
The Com grounds you are referring are signal grounds which should be connected according to the instructions to the input of the preamp / ouput of the I-select and also with each other at one point and then (from that point) to the power ground of the muse psu.

My recommendation is to connect all power grounds together (Muse, I-Select, DCG3) and then via a loop breaker to the earth ground. You can add a small value resistor between each ground (each channel separately) and LB.

The mute control might just well be power switch for an external muting relay which automatically mutes output when you power up or down the muse control. If that's the case it doesn't act like a volume mute.

To clarify these things a simple manual should be provided by the manufacturer.

Last edited by savvas; 11th February 2019 at 11:25 PM.
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Old 12th February 2019, 06:14 PM   #3574
jimk04 is offline jimk04  United Kingdom
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finally mocked up my DCG3 tonight for initial test.

Lots of hiss and then high pitch squeal. (from the speakers)

Any ideas?
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Old 12th February 2019, 07:18 PM   #3575
Salas is online now Salas  Greece
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Upload a picture of the mock-up. What power amp you use? Could be oscillating there, although we didn't have such a thing before for any type of tryout in the thread.
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Old 12th February 2019, 07:24 PM   #3576
jimk04 is offline jimk04  United Kingdom
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Thanks I'll get a picture.

Just roughly rigged into a Teac tripath power amp. Was using my Samsung S9 as source and volume control control. Also tried from a PC....same noise .
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Old 12th February 2019, 07:49 PM   #3577
jimk04 is offline jimk04  United Kingdom
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Don't judge me it is only a test before I go to box it all up!
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Old 12th February 2019, 08:25 PM   #3578
Salas is online now Salas  Greece
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Connect the input potentiometer also.
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Old 13th February 2019, 09:48 AM   #3579
jimk04 is offline jimk04  United Kingdom
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The 20k Dact type was delivered to me today also so I shall reconfigure nearer to final implementation.
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Old 13th February 2019, 11:05 AM   #3580
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Also check that C1 C2 are not in wrong places regarding pF values. Because they look very much the same i.e. small blue and their print is tiny.
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