ADDAC System ADDAC816 handleiding

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page 4ADDAC SYSTEM

ENVELOPE GAIN

Usually Attack/Decay envelopes have a maximum voltage of +5v, no matter if the input gate is +5v or

above the AD will clip at +5v. In this case we did not use this clipping method and instead allow the

incoming voltage to determine the maximum AD voltage, meaning that if a +5v gate is present then the

AD maximum voltage will be +5v but if a gate of +10v is sent then the AD maximum voltage will be +10v.

This also means that with higher input voltages the decay, although falling at the same speed, will be

longer than with lower voltages as it has a longer range to go back to 0v.

As we mentioned before the [INPUT GAIN] knob can amplify the incoming input up to a factor of 2, allow-

ing to use a standard +5v gate or envelope and being able to make the resultant AD go up to +10v.

The AD signal is responsible for opening the VCA.

Up to +5v the VCA will open to unity gain above this value the VCA will start to amplify and eventually

saturate and distort.

Below we show a graphic showing the exponential response of the VCA.

Also shown are the knob positions with respective amplification factor, at about 1:30 o’clock the gain is 1:1

from this position up to fully CW the amplification will exponential grow up to it’s maximum amplification

of 50 allowing to fully distort the input signal.

To avoid extreme volumes we use clipping diodes to limit the signal to aprox. ±5.5v

ADDAC816 User’s Guide

+5v

-5v

0v

+10v

+5v

0v

+5v

-5v

0v

CV INPUT

+10v

+5v

0v

CV OUTPUT (with Decay OFF)

AUDIO INPUT - TRIANGLE WAVE

AUDIO OUTPUT - EXPONENTIAL RESPONSE AND CLIPPING

VCA RESPONSE & LIMITER

x1 Amplification

(Unity gain)

Amplification

x2 Envelope

x50 Signal

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