A-167 is a module that compares
analog voltages and derives a gate signal. The state of the gate output (low/high) depends
upon which of the voltages is higher. It is possible to compare two external voltages (+In
and -In) or an external voltage (+In or -In) with a manually adjustable value (Offs.
control). Both analog inputs +In and -In are equipped with an attenuator. Internally the
module generates the voltage k1*(+In) - k2*(-In) + Offset and und sets or resets the
gate output depending on the result of this internal voltage (>0V or <0V). The factors k1 and k2 represent the manual attenuators. A LED shows
the current state of the gate output.
The Gap control is used to adjust a so-called "hysteresis". As long as this
control is set to zero the switching levels for both on and off state of the gate signal
are identical. As soon as the Gap control is turned up the switching levels for on and off
state fall apart and a so-called hysteresis appears. The sketch at the bottom of this page
shows the Gap function.
Normal and inverted gate outputs are available. In addition the internal voltage k1*(+In)
- k2*(-In) + Offset is available at the Analog Sum socket. Consequently the module
can be used as subtractor and offset generator too.
Applications: Generation of gate signals depending
upon analog voltages. E.g. a gate signal that depends upon the present value of a LFO
(triangle), ADSR or random signal can be generated and used to control a voltage
controlled switch that on the other hand switches different control voltages or audio
signals. The module can even be used to add the free-running mode to each ADSR ,e.g. A-140
similar to a LFO but with separate controls for rising and falling edge and exponential
waveforms - in contrast to the linear waveforms of a LFO.
For more detailed information please look at the English
user's manual A167_man.pdf
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