Doepfer A-196 PLL Manuel d'utilisateur télécharger pdf (Page 5)

doepfer

System A - 100

PLL

A-196

4. Controls

1 Range • 2 Offs.

The frequency range of the internal VCO is selected

with the switch 1.

Control 2 is used to adjust the frequency offset, i.e.

the maximum frequency within the range selected

with the switch 1. The table shows the VCO frequen-

cies obtainable with different settings of range and

offset (with a control voltage ~ 0...+5V at input !).

3 Type

The type of Phase Comparator (PC) is selected with

this switch. Three PC types are available:

• PC 1 Exclusive or gate (Exor)

• PC 2 RS Flipflop

• PC 3 more complex digital network

Each phase comparator has its special advantages

and disadvantages. E.g. PC1 locks even at harmonics,

i.e. integer frequency multiples of the external signal

and the internal VCO. This is a disadvantage for the

standard PLL idea but may be useful for certain musi-

cal effects. One has to find the most suitable PC for

each application.

4 LED

This LED lights up if the PLL is locked for PC2, i.e. if

the frequency of the external signal is identical to the

frequency of the internal VCO.

5 Frequ.

This control is used to adjust the frequency of the

internal low pass filter.

The internal LP can be replaced by an external LP. The

external LP has to be DC coupled and work even at

very low frequencies (some Hz range)! Consequenctly

normal audio VCFs are not suitable. The VC slew

limiter A-171 can be used instead. The "raw" PC output

& or the pre-filtered output % can be used as input for

the external filter/slew limiter. In this case the output of

the external filter/slew limiter is used as control input !

for the VCO.

Range Offset = 0 Offset = 5 Offset = 10

low

2 Hz - 50 Hz 2 Hz - 200 Hz 2 Hz - 1 kHz

mid

20 Hz - 500 Hz 20 Hz - 2 kHz 20 Hz - 10 kHz

high

200 Hz - 5 kHz 200 Hz - 20 kHz 100 Hz - 100 KHz

1 2 3 4 5 6 7 8

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Doepfer A-196 PLL Manuel d'utilisateur Page 5

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