ADDAC System ADDAC712 Manual de Usario

ADDAC System No categorizado ADDAC712

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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

OFF

INPUT 2

PREAMP

GAIN

CONTROL

MAXIMUM

GAIN

CONTROL

OUTPUT 2

OUTPUT

GAIN

CONTROL

CLIPPING

LED

MONITOR

BYPASS

OFF

Especificaciones del producto

Marca:	ADDAC System
Categoría:	No categorizado
Modelo:	ADDAC712
Color del producto:	Zilver
Peso.:	1800 g
Ancho:	152 mm
Profundidad:	152 mm
Altura:	244 mm
Material de la carcasa:	Roestvrijstaal
Fuente-de-alimentación:	AC
Activos:	1850 W
Capacidad del tanque de agua:	1.5 l
Apagado automático:	Ja
Almacenamiento de cable:	Ja
Protección contra sobrecalentamiento:	Ja
Inalámbrico:	Ja
voltaje-de-entrada-de-CA:	220-240 V
Frecuencia-de-entrada-de-CA:	50 - 60 Hz