DOEPFER A-188-2 Руководство - Страница 3

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The following table shows the relation between clock frequency, used output stage (tap) and delay time for the BBD circuit
used in the A-188-2 (MN3011).
Table 1: Relation between clock frequency [kHz], used output (tap) and delay time [ms]
clock frequency
BBD clock frequency
(clock input socket)
[kHz]
1
2
5
10
20
50
100
200
300
400
500
Remarks:
The
grey italic
characters indicate parameters out of the data sheet specifications as the MN3011 circuit is specified only for
clock frequencies between 10kHz and 100kHz. But the A-188-2 is able to generate even clock frequencies below 10kHz
and above 100kHz. From our experience the MN3011 cannot be damaged if it is operated with frequencies out of spec. This
is why we decided to include out-of-spec frequencies to obtain special audio effects – especially for clock frequencies below
10kHz. But the regular circuit behaviour is no longer guaranteed (especially increasing voltage losses at lower frequencies).
As the clock frequency falls below ~ 15 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.
(= 1/2 clock input)
[kHz]
396
0,5
396,00
1
198,00
2,5
79,20
5
39,60
10
19,80
25
7,92
50
3,96
100
1,98
150
1,32
200
0,99
250
0,79
System A-100
tap/stage output
662
1194
662,00
1194,00
331,00
597,00
132,40
238,80
66,20
119,40
33,10
59,70
13,24
23,88
6,62
11,94
3,31
5,97
2,21
3,98
1,66
2,99
1,32
2,39
BBD Module A-188-2
MN3011
1726
2790
1726,00
2790,00
863,00
1395,00
345,20
558,00
172,60
279,00
86,30
139,50
34,52
55,80
17,26
27,90
8,63
13,95
5,75
9,30
4,32
6,98
3,45
5,58
3328
3328,00
1664,00
665,60
332,80
166,40
66,56
33,28
16,64
11,09
8,32
6,66
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