Doepfer A-196 Bedienungsanleitung

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doepfer System A - 100PLL A-196

1

1. Introduction

Module A-196 contains a so-called Phase Locked

Loop circuit (PLL). A PLL consists of three parts:

VCO(linear voltage-controlled oscillator with rectangle

output), phase comparator(PC), and low-pass filter

(LPF). The three parts are connected in the A-196 with

normalled sockets to form the standard closed-loop

PLL frequency-feedback system. The normalled soc-

kets allow individual access to each part of the PLL

and enable other patches than the standard PLL (e.g.

insertion of external modules).

The andVCOis equipped with the controls Range

Offset. The range switch is used to select one of three

frequency ranges. The Offset control defines the maxi-

mum frequency of the VCO.

The module contains three different types of phase

comparators that are selected with a 3-position

switch.

The LED indicates if the PLL is locked for PC2 , i.e. if

the frequency of the internal VCO is the same as the

frequency of the external input signal.

The frequency of the built-in low pass filter is manu-

ally adjusted with the frequency control.

CV In

locked (2)

Offset

A-196

PLL

Out

In 1

Range

Out

VCO

Type

In 2

(Signal)

Out

PC

LPF

Frequ.

Produktspezifikationen