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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 Today, 05:38 PM   #4691
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
@66deg

I have AD823 with notch in the middle plus a dot left of the notch next to pin one. And I have other year of production AD823 with middle notch only. Both are valid. You aligned the notch with the socket's notch as also printed on the board and that's alright.

In general examine other people's builds closely from photos they posted in this thread. There are very many of those.

Gain 29dB is a number found in described as sensitive power amps not in modern preamps. Are you sure you want that? Brings explosive volume and hiss increase in any normal system.
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Old Today, 05:44 PM   #4692
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by 66deg View Post
I am going to order the transformers from Canterbury Windings and would just like to check that the TM160A is correct?
Standard Range
Type: TM160A Continuous power rating: 50VA
Primary: 0-240V @ 50Hz
Electrostatic screen
Secondary: 18-0-18V @ 1.39A rms
GOSS band
Dimensions: approx 83x44mm
Mounting: mounting kit

That's a very good choice for the DCG3 transformers.
GOSS band keeps electromagnetic interference in check.
Few transformers offer such stray field shield as standard.
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Old Today, 05:50 PM   #4693
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by 66deg View Post
Hi Salas,
...

Item 5 TO220 silpads , The 6x plastic grommets I have not found them on Mouser. Are they for trapping the MOSFETs down? will a washer be ok?

Item 11, The info sheet says T350mA and in the kit the fuses are T400mA, I thought it a good idea to get some spares should I get the same as in the kit or get the 350mA?
For BOM little things read the manual's list many times. T350mA or T400mA isn't a big deal of a difference. Get the same as spares, no worries. For items which are coming from a mini-kit ask Tea for details. SilPads and nylon mounting grommets for the MOSFETS are essential. They must be isolated from their sinking both at the back and in the neck else kaboom! In the end you will check with the DMM's buzzer (continuity mode) that no MOSFET metal tab produces beeps when probing between it and the metal surface they are mounted on. Before powering up. If ts black anodized surface find a shiny spot to measure. You can also measure on the metal screws heads.
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Old Today, 07:14 PM   #4694
Oracle1 is offline Oracle1  Greece
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Default Its alive....

Another DCG3 is alive....
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Old Today, 07:18 PM   #4695
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
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