Doepfer A-188-1 BBD Module - Manual (Page 3)

DOEPFER DOEPFER DOEPFER DOEPFER System A-100 BBD Module A-188-1
3
The following table shows the relation between clock frequency, delay time and number of stages for some typical BBD
circuits.
Relation between clock frequency [kHz] and delay time [ms]
BBD circuit
number of stages
clock frequency
(clock input socket)
BBD clock frequency
(= 1/2 clock input)
MN3006
MN3206 MN3009
MN3209 MN3004 (*)
MN3204
MN3007 (*)
MN/BL3207
MN3008
MN/BL3208
MN3005
MN3205
[kHz] [kHz] 128 256 512 1024 2048 4096
1 0,5 128,00 256,00 512,00 1024,00 2048,00 4096,00
2 1 64,00 128,00 256,00 512,00 1024,00 2048,00
5 2,5 25,60 51,20 102,40 204,80 409,60 819,20
10 5 12,80 25,60 51,20 102,40 204,80 409,60
20 10 6,40 12,80 25,60 51,20 102,40 204,80
50 25 2,56 5,12 10,24 20,48 40,96 81,92
100 50 1,28 2,56 5,12 10,24 20,48 40,96
200 100 0,64 1,28 2,56 5,12 10,24 20,48
300 150 0,43 0,85 1,71 (*) 3,41 (*) 6,83 13,65
400 200 0,32 0,64 1,28 (*) 2,56 (*) 5,12 10,24
500 250 0,26 0,51 1,02 2,05 4,10 8,19
(*) The max. clock frequency is 100 kHz only for MN3004 and MN3007 (in contrast to 200kHz for MN3204 and MN3207)
Remarks:
The standard versions of the A-188-1 with 1024 and 2048 stages are marked with bold characters.
The
grey italic 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.