DOEPFER SYSTEM A - 100 Bedienungsanleitung Seite 1285

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The following table shows the relation between clock frequency, delay time and number of stages for some typical BBD

clock frequency

(clock input socket)

(*) The max. clock frequency is 100 kHz only for MN3004 and MN3007 (in contrast to 200kHz for MN3204 and MN3207)

The standard versions of the A-188-1 with 1024 and 2048 stages are marked with bold characters.

characters indicate parameters out of the data sheet specifications (e.g. clock frequencies below 10kHz for

all BBD devices, and clock frequencies beyond 100kHz or 200kHz for certain BBD devices). But parameters out of spec

may be available with the A-188-1. As the BBD devices cannot be damaged if they are operated with frequencies out of

spec we decided to allow such frequencies with the A-188-1 to obtain special audio effects – especially for clock

frequencies below 10kHz. But the regular behaviour is no longer guaranteed (especially increasing voltage losses at lower

frequencies). As the clock frequency falls below ~ 20 khz the clock signal itself will become audible. This clock noise can be

used as unusual audio source or it can be filtered out with an external low pass filter.

Relation between clock frequency [kHz] and delay time [ms]

BBD clock frequency

(= 1/2 clock input)

System A-100

number of stages

BBD Module A-188-1