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4. Controls and In- / Outputs

4.1. High Speed VCO Section

Delay :

manual delay/clock control

CV1:

CV1 input HSVCO

CV2:

CV2 input HSVCO

CV2:

attenuator for CV2

Clk Out:

clock output HSVCO

CV Out:

CV output HSVCO

This group of elements is responsible for the clock

frequency generated by the high speed VCO (HSVCO).

knob 3 Delay Clock is used to adjust the clock manually.

Two CV inputs (! CV1, " CV2) are available to control the

clock by external control voltages (e.g. LFO, envelope

follower,

random,

ADSR,

theremin, ribbon controller, foot controller, Midi-to-CV,

shepard

generator

...).

approximately 1V/octave. The diagram on the right side

shows the connection between CV1 and clock frequency.

The straight line represents the perfect 1V/oct graph. The

slightly bended curve is the real behaviour of the HSVCO. If

an absolutely "perfect" 1V/octave control is required an

external precision HSVCO or a VCO with PLL has to be

used.

The second control voltage input " CV2 is equipped with a

polarizer. The function of a polarizer is described on page 5.

System A-100

keyboard

CV,

sequencer,

The

sensitivity

CV1

Fig 6: relation between CV1 and Clock Frequency

Clk Out:

clock output HSVCO

This is the clock output of the HSVCO. It is internally

connected to the clock input of the BBD section. The

waveform is rectangle with about ± 3V level. The rectangle

slopes flatten with increasing frequency and the waveform

turns more and more into triangle. Even the load on the

output

has

influence

Consequently for all clock patches from and to the A-188-2

only short patch cables (~ 30 cm) should be used because

long cables function as low pass filters for signals above

20kHz. The max. frequency at this output is about 250 kHz.

BBD Module A-188-2

the

waveform

and

level.