ADDAC System ADDAC712 Bedienungsanleitung


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Instruments for Sonic Expression
Est.2009
December.2022
USER’S GUIDE . REV01
ADDAC712
VINTAGE
PREAMP
INTRODUCING
From Portugal with Love!
ADDAC712 VINTAGE PREAMP USER’S GUIDE
December.2022Revision.01
Welcome to:
page 2ADDAC SYSTEM
DESCRIPTION
ADDAC712 is a dual channel discrete gain staging ampli-
fier, based on a famous discrete preamp board from the
70’s used in some legendary equipment.
What caught our attention was the character of it’s
clipping and resulting saturation/distortion.
The module can be used with modular signals to add a
distortion/fuzz character or as a preamp for an external
source such as a line source, keyboard, guitar...
It’s also a great side companion for our ADDAC711
Balanced Inputs.
At the top an On/Off [BYPASS] switch routes the signal
into the Effect (Up: Active) or to the bottom output gain
stage (Down: Bypassed).
The ammount of amplification is set by the [GAIN]
control, the maximum ammount of amplification can be
set by the user using the [MAX GAIN] trimmer.
Up to ±5.5v the incoming signal will keep it’s integrity,
beyond this point saturation will start to increase.
At aprox. ±6v a hard clipping will start to occur, this
clipping also has a particular quality that at extreme
levels it drifts the audio 0v bias reference, moving it
upwards which results are similar to a Gate effect.
In the middle, an p2-x2 opamp based output gain stage
with a clipping led, which monitors the clipping at the
output, and an [OUTPUT] control to set the output
volume.
Having the top and middle gain stages provides flexibili-
ty allowing the user to completelly distort the signal on
the top stage and tame it’s output level with the second
stage.
At the bottom, Input and Output for both channels (Left
input is normalled into Right input).
This module will also be available as a full DIY kit..
Tech Specs:
6HP
4 cm deep
40mA +12V
40mA -12V
page 3ADDAC SYSTEM
ADDAC712 User’s Guide
ADDAC712
VINTAGE PREAMP SIGNAL FLOW DIAGRAM
INPUT 1
PREAMP
GAIN
CONTROL
MAXIMUM
GAIN
CONTROL
OUTPUT 1
OUTPUT
GAIN
CONTROL
CLIPPING
LED
MONITOR
BYPASS
ON
OFF
INPUT 2
PREAMP
GAIN
CONTROL
MAXIMUM
GAIN
CONTROL
OUTPUT 2
OUTPUT
GAIN
CONTROL
CLIPPING
LED
MONITOR
BYPASS
ON
OFF


Produktspezifikationen

Marke: ADDAC System
Kategorie: Nicht kategorisiert
Modell: ADDAC712

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