3D
Model
This module is a very standard
logarithmic response ADSR envelope generator.
It is not voltage controlled. It is for use
where a basic envelope generator is adequate.
There are two identical envelope generators on
the PCB.
How to use this module:
Connect your external GATE signal to the
[GATE] input. Adjust the pots as required.
Rotating the pots clockwise will increase the
time of any particular stage, or in the case
of [SUSTAIN] increase voltage of the sustain
portion of the cycle. The output is
exponential due to the basic
resistor/capacitor configuration used in the
timing cycle.
- A
push button [MANUAL] is supplied to
provide a manual GATE signal. Upon the
[GATE] input going HIGH the EG immediately
begins it's ATTACK cycle. This will
continue until one of the following
occurs:
- the
[GATE] input returns to LOW. If this
occurs, the EG immediately goes into
its RELEASE cycle, the output
decreasing to zero. Thus with longer
attack times set, a short [GATE]
signal will produce an envelope with a
reduced output, which can be useful
for expression.
- the
attack peak is reached (approximately
5 volts). When this occurs, the EG
immediately goes into its DECAY cycle,
where the output will decrease until
it reaches the voltage set by the
[SUSTAIN] pot. If this is zero, the
output will drop to zero, effectively
terminating the cycle. If it is above
zero, this voltage will be held as
long as the [GATE] input is HIGH. When
the [GATE] input returns to LOW, the
EG immediately goes into its RELEASE
cycle, the output decreasing to zero.
The
retrigger input [RETRIG] restarts the
ATTACK portion of the cycle if the [GATE]
input is HIGH. It can be used to modulate
the ATTACK, DECAY, SUSTAIN portion of the
cycle. A rapid burst of pulses on this
input can push the envelope higher than
the usual peak if the [ATTACK] is set to a
sufficiently short length. The LED and
[ATTACK PULSE] output are active during
the ATTACK part of the cycle. This allows
the EG to be used as a gate to pulse
converter, the pulse length controlled by
the setting of the [ATTACK] pot.
- The
EG CANNOT be set to self oscillate or
cycle.
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