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Doepfer A-188-1 BBD Module Bucket Brigade Delay

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Switched On Music Electronics
Austin, TX, United States
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About This Listing

This 4096 stage A-188-1 is fully functional and in good condition with some rack rash.  

The A-188-1 is a versitle multifunction BBD module.  It very flexible in it's raw open ended design and can be utlized as a classic analog delay, flanger, or chorus effect, as well as for Karplus/Strong synthesis.

  • High speed VCO (HSVCO) section:
    • manual delay control
    • delay CV input (CV1) without attenuator (about 1V/oct) and polarity switch (negative/off/positive)
    • delay CV input (CV2) with attenuator and polarity switch (negative/off/positive)
    • turning the manual delay knob clockwise or an increasing the external CV with polarity switch in positive position increases the clock and consequently decreases the delay time (similar to a VCF or VCO, especially because of Karplus-Strong synthesis applications)
    • clock output (e.g. to control another BBD, SC-Filter or delay module)
    • CV output (e.g. to control a VCF that follows the BBD clock), this voltage is composed of the manual delay control, CV1 and CV2
  • BBD/audio section:
  • standard versions of the module: 1024 or 2048 stage BBD (choice at order, a mark at the front panel identifies the type of BBD, similar to A-138a/b)
  • special versions of the module: 128, 256, 512 or 4096 stage BBD (additional charge, available only while stocks of these special BBD chips last)
  • delay range for 1024 stage BBD module: ~ 2.5 ms to ??? (corresponds to max. a clock frequency of ~ 200 kHz)
  • delay range for 2048 stage BBD module: ~ 7 ms to ??? (corresponds to max. a clock frequency of ~ 150 kHz)
  • the delay ranges for the 128, 256, 512 and 4096 stage versions can be found in the user's manual .
  • the max. delay time (???) is not specified as it depends upon the desired quality of the delayed audio signal. The signal becomes more and more poor as the clock frequency is reduced (please refer to the corresponding note below and listen to the audio examples for details)
  • external clock input (used to control the module e.g. from an external HSVCO or from another BBD module). The socket is normalled to the output of the internal clock oscillator.
  • two audio inputs (connected as a miniature multiple) with attenuator
  • BBD output (raw delayed output without original signal, e.g. for external feedback control via other A-100 modules, e.g VCA or VCF), the BBD output is affected by the feedback polarity switch to obtain the polarity function even for external feedback loops
  • manual feedback control
  • feedback polarity switch (positive/off/negative), affects even the BBD output socket
  • external feedback input (the socket is normalled to BBD output)
  • BBD signal polarity switch (positive/off/negative)
  • mix control (relation between original signal and positive or negative BBD signal)
  • mixed audio output
  • Width: 14 HP
  • Depth: 60 mm
  • Current:  +80mA (+12V) / -50mA (-12V)

Product Specs

Listed4 years ago
ConditionVery Good (Used)
Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.learn more

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