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System A - 100

Dual Slew Limiter A-170

1. Introduction

Module A-170 (Dual Slew Limiter) contains two sepa-

rate slew limiters, also known as

portamento control-

lers or integrators.

The

upper SL

has just one

joint control

, which sets

both rise and fall times (c. 0 ...10 sec).

The lower SL has separate controls for rise and fall

times, and can therefore be used as a simple AR

envelope generator. Over and above this, you can set

the overall range for these parameters, with a three-

position switch, as on the full ADSRs.

Both slew limiters have two LEDs each, to show the

state of the rising and falling voltages.

Control

Time

A-170

DSL

Out

Control

Time

Range

Out

- +

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer Dual Slew Limiter A-170 1. Introduction A-170 In DSL Out Time Control + Ï In Module A-170 (Dual Slew Limiter) contains two separate slew limiters, also known as portamento controllers or integrators. The upper SL has just one joint control, which sets both rise and fall times (c. 0 ...10 sec). The lower SL has separate controls for rise and fall times, and can therefore be used as a simple AR envelope generator.
PAGE 2
A-170 Dual Slew Limiter System A - 100 Controls and indicators: 2.
PAGE 3
System A - 100 doepfer 3. Controls and indicators Dual Slew Limiter A-170 Out Out In In 1 Time This control sets the rise / fall time tC of slew limiter 1 (see Fig. 1) in a range from 0 to 10 seconds. 2 - LED • 6 - LED LEDs 2 and 6 are the status indicators for the slew limiters’ falling edges. 3 + LED • 7 + LED LEDs 3 and 7 are the status indicators for the slew limiters’ rising edges. t t C t C upper SL t A lower SL 4 Ï Fig.
PAGE 4
A-170 Dual Slew Limiter System A - 100 doepfer 4. In /Outputs 5. User examples ! In Portamento • § In Sockets ! (upper SL) and § (lower SL) are the slew limiters’ inputs. Patch in the voltage you want to modify here, and use the time controls tC (upper SL) and/or tA, tR (lower SL) to alter the waveform’s rise and fall characteristics. " Out • The example in Fig. 2 shows the A-170 (upper SL !) as a portamento generator.
PAGE 5
System A - 100 doepfer Slew limiter as AR envelope generator You can use the lower A-170 as a simple AR envelope generator, for instance in the example in Fig. 4, to help create a certain percussive bass sound. CV V CO V CF Dual Slew Limiter A-170 When a new note is played, the carrier VCO reacts immediately, while the modulator VCO glides gradually to the pitch of the note, producing a complex timbral sweep. A DSR V CA Gat e A-170 Gat e CV V CO 1 V CA 1 V CA 2 A-170 Fig.
PAGE 6
A-170 Dual Slew Limiter System A - 100 doepfer Creating complex envelopes A combination of the Clock Divider / Sequencer (A160/161) and a number of A-170 slew limiters can produce complex envelopes (see Fig. 5). The Clock Sequencer triggers the Slew Limiters in sequence, and their various envelopes are mixed in a linear mixer A-138a. The result is a complex envelope which can be patched from the mixer output to anywhere.
PAGE 7
doepfer System A - 100 Dual Slew Limiter A-170 7
PAGE 8
A-170 Dual Slew Limiter System A - 100 doepfer 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system. Make multiple copies of your composite diagram, and use them for remembering good patches and set-ups.