Module A-142-1 is a voltage controlled envelope generator. The only time parameter is decay (like TB303).

Decay may be adjusted manually and via voltage control input (with attenuator). The envelope output is displayed with LED control. Additionally from the envelope signal a Gate signal and an inverse Gate signal with adjustable threshold is derived. LED control for Gate output. Thus one obtains a voltage controlled Gate additionally or alternatively to the envelope signal with voltage controlled duration. The attack time is fixed to about 0.2 ms, the shortest decay time is about 2 ms. By changing the value of a capacitor the shortest time can be modified.

Merk:

Doepfer

Type:

Envelope, Function Generator

Nummer:

A-142-1

Diepte:

70mm

Breedte:

8HP

Power:

40mA @ +12V, 30mA @ -12V

Module A-142-4 contains four simple envelope generators.

The only time parameter is Decay and can be adjusted manually by means of the Dec. control in the range 2 ms ... 2 seconds. The attack time can be adjusted internally by means of a separate trimming potentiometer for each sub-unit in the range 1 ms ... 15 ms. The factory setting is about 3 ms. This is the attack time of the TB303. Each envelope output has a LED control available. The trigger inputs are normalized (1 -> 2 -> 3 -> 4). Suggestions for modifications: - Each sub-unit has a pin header with two pins available. When the two pins are shortened (e.g. by means of a jumper or a toggle switch connected to the two pins) the corresponding sub-unit changes to a loop mode. In this mode the unit is triggered by itself like an LFO.. - By changing the value of a capacitor the time range can be modified (e.g. 0.2 ms ... 0.2 seconds or 20 ms ... 20 seconds)

Merk:

Doepfer

Type:

Envelope, Function Generator

Nummer:

A-142-4

Diepte:

50mm

Breedte:

8HP

Power:

30mA @ +12V, 10mA @ -12V

Module A-143-2 is a four-fold ADSR type envelope generator.

The module contains 4 independent ADSR-type envelope generators. Each sub-module has available the controls Attack, Decay, Sustain and Release. The three-position Range switch allows to select the desired time range (low - high - medium). The adjustable envelope time ranges from several minutes to some milliseconds.

On top of this each sub-module is equipped with three digital outputs (high/low): "End of Attack (EOA)", "End of Decay (EOD)" and "End of Release (EOR)". As soon as the criterion is valid (e.g. end of decay state) the corresponding digital outputs turns to "high". These outputs can be used e.g. to daisy-chain several ADSR sub-modules. For this the digital output in question (EOA, EOD or EOR) has to be connected to the Gate input of the following ADSR. Even automatically running envelopes (pseudo LFOs) or so-called "quadrature envelopes" with cyclical modulations of several ring-shaped, daisy-chained ADSRs are possible.

To obtain a pseudo LFO simply the EOD or EOR output has to be connected to the Gate input of the same ADSR. In addition to the obligatory Gate (G) input for envelope generators each sub-module has available a Retrigger (Rt) input. The retrigger turns the direction to "upward" if the envelope has already reached the decay state while the retrigger pulse occurs. If the envelope is still in the attack phase the retrigger input has no meaning. This a different behaviour from A-140 and A-141 !

The Gate inputs of the units 2, 3 and 4 are normalled to the Gate input of unit 1, i.e. Gate input 1 is connected to the switching contacts of the Gate input sockets 2, 3 and 4. Thus one Gate signal applied to Gate input 1 can be used to trigger all four sub-modules simultaneously. The envelope outputs are displayed with LEDs. The maximal envelope voltage (Attack/Decay reversal point) is about +8V.

Merk:

Doepfer

Type:

Envelope, Function Generator

Nummer:

A-143-2

Diepte:

50mm

Breedte:

26HP

Power:

70mA @ +12V, 50mA @ -12V