{"product_id":"doepfer-a-188-1av-bbd-delay-512-stages-vintage-edition-b-stock","title":"DOEPFER A-188-1AV BBD DELAY 512 STAGES VINTAGE EDITION : B-STOCK","description":"\u003ctable border=\"0\" cellpadding=\"4\" bgcolor=\"#FFFFFF\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eModule A-188-1 is a so-called \u003cspan style=\"text-decoration: underline;\"\u003eB\u003c\/span\u003eucket \u003cspan style=\"text-decoration: underline;\"\u003eB\u003c\/span\u003erigade \u003cspan style=\"text-decoration: underline;\"\u003eD\u003c\/span\u003eevice module (abbr. BBD). BBDs have been used to delay audio signals before digital delays dethroned the BBD based effect units. But BBDs have some very unique advantages (or disadvantages dependent on the point of view) over the digital counterpart which result from the special properties of the BBDs. BBD circuits can be treated as a chain of Sample\u0026amp;Hold units (S\u0026amp;H) which pass on their voltages to the next S\u0026amp;H in the chain at each clock pulse. A more detailed explanation – including the different types of BBDs – can be found in following chapter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"Bodytext\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIn any case the sounds generated by module A-188-1 are very special. Typical applications are: Flanger, Chorus, Analog Delay or Karplus\/Strong synthesis. But as the A-188-1 has a lot of very unique features (voltage controlled clock rate \/ delay time with extreme range, polarity switches for the CV inputs, feedback and BBD out\/mix, clock and CV output of the high speed VCO, BBD clock input, feedback insert, feedback up to self-oscillation) a lot of unusual applications can be realized with the module (e.g. delay controlled by ADSR, envelope, random or sequencer with positive or negative effect). The A-188-1 also has no built-in anti-alisaing filter in order not to limit the possibilities of the module. For this the CV out is intended.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"Bodytext\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eA more detailed description of the module can be found in the user's manual  \u003ca href=\"http:\/\/www.doepfer.de\/a100_man\/A1881_man.pdf\"\u003eA1881_man.pdf\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eOriginally A-188-1 was developed for BBD curcuits with 1024 or 2048 stages as these circuits are still in production. Bur \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan style=\"font-size: small;\"\u003ew\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003ee found a limited quantity of normally obsolete BBD devices with 128, 256, 512 and 4096 stages (MN3006, MN3009\/3209, MN3204, MN3005). These are more expensive than the two standard circuits with 1024 and 2048 stages. Therefore the module versions with 128, 256, 512 or 4096 stages are more expensive and available only while stocks last. The BBD type used in the module is indicated by a dot at the front panel. These are the names of the different versions:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003eA-188-1\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eX\u003c\/strong\u003e\u003c\/span\u003e with\u003cspan style=\"color: #ff0000;\"\u003e 128\u003c\/span\u003e stages BBD (MN3006\/MN3206), available only as long as quantities of MN3006\/MN3206 last\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003eA-188-1\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eY\u003c\/strong\u003e\u003c\/span\u003e with\u003cspan style=\"color: #ff0000;\"\u003e 256\u003c\/span\u003e stages BBD (MN3009\/MN3209), available only as long as quantities of MN3009\/MN3209 last\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003eA-188-1\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eA\u003c\/strong\u003e \u003c\/span\u003ewith\u003cspan style=\"color: #ff0000;\"\u003e 512\u003c\/span\u003e stages BBD (MN3004\/MN3204), available only as long as quantities of MN3004\/MN3204 last\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003eA-188-1\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eB\u003c\/span\u003e\u003c\/strong\u003e with \u003cspan style=\"color: #ff0000;\"\u003e1024\u003c\/span\u003e stages BBD (MN3007\/MN3207\/BL3207), \u003cstrong\u003estandard version\u003c\/strong\u003e, no delivery limitations \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003eA-188-1\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eC\u003c\/span\u003e\u003c\/strong\u003e with \u003cspan style=\"color: #ff0000;\"\u003e2048\u003c\/span\u003e stages BBD (MN3008\/MN3208\/BL3208), \u003cstrong\u003estandard version\u003c\/strong\u003e, no delivery limitations \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003eA-188-1\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eD\u003c\/span\u003e\u003c\/strong\u003e with \u003cspan style=\"color: #ff0000;\"\u003e4096\u003c\/span\u003e stages BBD (MN3005\/MN3205), available only as long as quantities of MN3005\/MN3205 last\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eFor the BBD circuits with 128 and 4096 stages the first version of the A-188-1 cannot be used without modifications (additional electronic parts and wires, interrupted pcb tracks). The revised version of the module is delivered since about June 2006 and contains several jumpers to select the desired BBD circuit. If desired we are able to modify the first version of the module for the BBD with 4096 or 128 stages (additional charge).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe above pictures shows the front panel (version 2) and the scheme of the BBD module. These controls and in\/outputs are available:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eHigh speed VCO (HSVCO) section:\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003emanual delay control\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003edelay CV input (CV1) without attenuator (about 1V\/oct) and polarity switch (negative\/off\/positive)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003edelay CV input (CV2) with attenuator and polarity switch (negative\/off\/positive)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eturning 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)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eclock output (e.g. to control another BBD, SC-Filter or delay module)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eCV output (e.g. to control a VCF that follows the BBD clock), this voltage is composed of the manual delay control, CV1 and CV2\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD\/audio section:\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003estandard 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) \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003especial versions of the module: 128, 256, 512 or 4096 stage BBD (additional charge, available only while stocks of these special BBD chips last)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003edelay range for 1024 stage BBD module: ~ 2.5 ms to ??? (corresponds to max. a clock frequency of  ~ 200 kHz)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003edelay range for 2048 stage BBD module: ~ 7 ms to ??? (corresponds to max. a clock frequency of  ~ 150 kHz)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-family: Arial; font-size: small;\"\u003ethe delay ranges for the 128, 256, 512 and 4096 stage versions can be found in the \u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003euser's manual \u003ca href=\"http:\/\/www.doepfer.de\/a100_man\/A1881_man.pdf\"\u003eA1881_man.pdf\u003c\/a\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003ethe 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)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eexternal 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.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003etwo audio inputs (connected as a miniature multiple) with attenuator\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD 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\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003emanual feedback control\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003efeedback polarity switch (positive\/off\/negative), affects even the BBD output socket\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan style=\"font-size: small;\"\u003eexternal feedback input (the socket is normalled to BBD output)\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD signal polarity switch (positive\/off\/negative)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003emix control (relation between original signal and positive or negative BBD signal)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003emixed audio output\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan style=\"font-size: small;\"\u003eLinks to some audio examples are available \u003ca href=\"http:\/\/www.doepfer.de\/A1881.htm#audio%20examples\"\u003ebelow\u003c\/a\u003e (with 2048 and 1024 stage BBD devices). The main difference between the two types of BBDs is the delay time range. The maximum clock frequency mentioned in the data sheet of the 2048 stage BBD is 100kHz. This leads to a minimum delay time of about 10ms. But we found that the device is able to operate even a bit beyond this spec (up to ~ 150kHz) causing a minimum delay time of about 7ms. The maximum clock frequency mentioned in the data sheet of the 1024 stage BBD is 200kHz. This leads to a minimum delay time of about 2,5ms. Overclocking is not possible for the 1024 stage BBD.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe maximum (useful) delay time is hard to define. The output becomes more and more crunchy as the clock frequency goes down because the number of samples per second taken from the original signal decreases as the clock frequency is reduced. But this is only one aspect. Indeed several effects occur simultaneously:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003ekind of bit crunching because of the increasing time between samples taken from the audio signal\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003ealiasing effect as the sample rate becomes less than twice the max. audio frequency\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD losses: the BBDs are not specified for clock frequencies less than 10 kHz (this value is valid for both 1024 and 2048 stage BBDs). The BBDs can be treated like a chain of sample\u0026amp;hold units with very small capacitors (the capacitors are integrated on the BBD chip). Clock frequencies below 10kHz cause voltage losses as the holding times of the S\u0026amp;Hs are no longer sufficient to pass on the voltages to the succeeding stage without errors\/losses.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan style=\"font-size: small;\"\u003eThe sound effects of low clock frequencies can be heard in the audio examples \u003ca href=\"http:\/\/www.doepfer.de\/A1881.htm#audio%20examples\"\u003ebelow\u003c\/a\u003e.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e\u003chr size=\"1\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe \u003cstrong\u003efirst section\u003c\/strong\u003e of MP3 examples is made with a \u003cstrong\u003e2048 stage BBD\u003c\/strong\u003e device. The maximum clock frequency mentioned in the data sheet of the 2048 stage BBD is 100kHz. This leads to a minimum delay time of about 10ms. But we found that the device is able to operate even a bit beyond this spec (up to ~ 150kHz) causing a minimum delay time of about 7ms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eTwo different audio sources are used for the examples:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Source_1.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Source_1.mp3\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e: a short sample recorded with the A-112 (original signal #1 without BBD effect for reference)\u003cbr\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Source_2.mp3\"\u003eBBD_Source_2.mp3\u003c\/a\u003e: an 8 note sequence made with A-100 modules: A-110 + A-105 + A-140 controlled by a MAQ16\/3 (original signal #2 without BBD effect for reference)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eFor both audio signals a standard flanger appication was made: triangle output of a LFO is used to control the clock CV input of the BBD module, short delay time\/high clock rate, medium resonance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Flange_LFO_1.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Flange_LFO_1.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Flange_LFO_2.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Flange_LFO_2.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eFor the first audio signal an example with an envelope follower was made. The A-112 output is processed by an A-119. The envelope output of the A-119 is used to control the clock CV input of the BBD module. In addition the manual clock rate is reduced by hand during the example. At the end of the example the sound becomes more and more \"destroyed\" as the clock rate goes below the value that is specified for the BBD circuit. In addition at the end of the example the clock frequency can be heard as it is now in the audible range (the input signal is scanned with the audible clock rate):\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Envelope_1.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Envelope_1.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIn the last example the second audio source is used and the clock rate is changed manually over the whole range and back again. Additionally the resonance\/feedback is lowered a bit by hand during the delay times.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Manual_2.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Manual_2.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe next mp3's show some examples of the \u003cstrong\u003eKarplus-Strong\u003c\/strong\u003e synthesis. The patch is the same for all examples:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\"\u003e \u003c\/p\u003e\n\u003cp align=\"center\"\u003e\u003cstrong\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eKarplus-Strong patch\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe digital noise signal of the A-117 is processed by a VCA (A-131) that gets it's envelope from an envelope generator (A-140). The output of the VCA is the audio input of the BBD module. A sequencer MAQ16\/3 that is used to generate a simple sequence. The gate output of the MAQ16\/3 is triggering the gate input of the A-140, the CV output of the MAQ16\/3 is controlling the CV clock of the BBD module.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe first three examples show the patch at different settings of the manual clock control of the BBD module (no parameter is changed during the example in question):\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Karplus_1.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Karplus_1.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Karplus_2.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Karplus_2.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Karplus_3.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Karplus_3.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIn the next example the \u003cem\u003eResonance (or feedback)\u003c\/em\u003e control of the BBD module is increased manually (all other parameters remain unchanged):\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Karplus_Resonance.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Karplus_Resonance.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIn the following example the \u003cem\u003eDecay\u003c\/em\u003e of the Envelope generator (A-140) is increased manually (all other parameters remain unchanged)::\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Karplus_Decay.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Karplus_Decay.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIn the last example the \u003cem\u003eClock rate \u003c\/em\u003eof the digital noise (A-117) is increased manually (all other parameters remain unchanged)::\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_Karplus_Source_Clock.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_Karplus_Source_Clock.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eWith suitable modules all the manually changed parameters can be voltage controlled too (e.g. external VCA in the feedback loop of the BBD module, A-141 or A-142 instead of A-140, external clock for the A-117, e.g. from an A-110 or A-111). And of course another sound source can be used (e.g. \"analog\" blue\/red noise from A-118, \"2 oscillators\" or \"6 oscillators\" signal of A-117, VCO, external signal, looped A-112 sample and so on).\u003c\/span\u003e\u003c\/p\u003e\n\u003chr size=\"1\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eFor the \u003cstrong\u003esecond section\u003c\/strong\u003e of examples the module has been modified so that a \u003cstrong\u003e1024 stage BBD\u003c\/strong\u003e device could be used. The maximum clock frequency mentioned in the data sheet of the 1024 stage BBD is 200kHz. This leads to a minimum delay time of about 2,5ms. One of the audio sources of the above examples (BBD_Source_1.mp3) is also used for the examples with the 1024 stage BBD module\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe first two examples show again kind of a flanger application (triangle output of a LFO is used to control the delay CV input of the BBD module). In the beginning only the original signal appears. Then the delayed signal is added manually without feedback (mix control is changed from 0% to 50%, feedback control = 0). Then the feedback is increased manually. The only difference between the two examples is the feedback polarity:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_1024_Flange_LFO_Feedback_1.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_1024_Flange_LFO_Feedback_1.mp3\u003c\/span\u003e\u003c\/a\u003e \u003cspan style=\"font-family: Arial; font-size: small;\"\u003e(feedback switch set to \"+\")\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_1024_Flange_LFO_Feedback_2.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_1024_Flange_LFO_Feedback_2.mp3\u003c\/span\u003e\u003c\/a\u003e \u003cspan style=\"font-family: Arial; font-size: small;\"\u003e(feedback switch set to \"-\")\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe next example shows the full delay range of the 1024 stage BBD module that is possible with the internal HSVCO. The delay time is changed manually from minimum to maximum (manual delay control is changed from ccw to cw by hand). Feedback is set to medium.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_1024_fullrange_manual.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_1024_fullrange_manual.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIn the last example the delay time is controlled by an analog sequencer (2xA-155 + A-154). Feedback is set to medium. Same audio source as for the other examples.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/www.doepfer.net\/A100_sounds\/BBD_1024_sequenced_flange.mp3\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBBD_1024_sequenced_flange.mp3\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e\u003chr size=\"1\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"top\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e(Non-) Linearity of the high speed VCO used in the BBD module\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eThe \u003cspan style=\"color: #008000;\"\u003egreen line\u003c\/span\u003e shows the behaviour of a \u003cspan style=\"color: #008000;\"\u003eperfect HSVCO\u003c\/span\u003e, the \u003cspan style=\"color: #ff0000;\"\u003ered line\u003c\/span\u003e the \u003cspan style=\"color: #ff0000;\"\u003e\"real\" HSVCO\u003c\/span\u003e of the BBD module\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e\u003chr size=\"1\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" align=\"left\" valign=\"top\"\u003e\n\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eBreite\/Width: 14 TE \/ 14 HP \/ 70.8 mm\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: small;\"\u003eTiefe\/Depth: 60 mm (gemessen ab der Rückseite der Frontplatte \/ measured from the rear side of the front panel)\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eStrombedarf\/Current: 80 mA\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"DOEPFER","offers":[{"title":"Default Title","offer_id":46819703619757,"sku":null,"price":207.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/3449\/7197\/products\/a-188-1av.jpg?v=1645045934","url":"https:\/\/www.detroitmodular.com\/products\/doepfer-a-188-1av-bbd-delay-512-stages-vintage-edition-b-stock","provider":"Detroit Modular","version":"1.0","type":"link"}