AMT Analoger ACV-1, User Manual

Page 1: ...Analoger ACV 1 100 Analog Bucket Brigade Chorus Vibrato Time Warping Modulator User Manual Revision A Last Revision 8 3 2022 ...

Page 2: ...pedal grade BBDs found in most stompboxes We powered it with a clean high voltage 15V power supply Next we coupled it with a special blend of two tightly tuned high Q 5th order anti alias and reconstruction filters a compandor with emphasis de emphasis VCA feedback control a unique 5 amp high current BBD driver and an analog clock with exponential modulation technology to obtain unprecedented soun...

Page 3: ...o this today for the same reason Today they are used almost exclusively for audio processing in delay chorus and flanger effects The ACV 1 uses a recreation of the Matsushita Panasonic MN3007 PMOS BBD from Xvive The MN300x series BBDs use a higher voltage for superior clarity noise headroom and distortion compared to the MN320x NMOS types typically found in most stompboxes However the MN320x BBDs ...

Page 4: ...o do not put out the entire signal at the same time Half the signal is a clock behind the rest of the signal yet combined at the same time making for a strange smeared mixing of the signal samples slightly out of time Other components in a BBD circuit are also responsible for the signature sound of analog delays BBDs require companding and emphasis de emphasis networks to improve the signal to noi...

Page 5: ...o the left and then time will be fleeting Let s do it again The schematic drawing was adapted from the original Panasonic sketch of the BBD internals It shows the bi phase clock and capacitor storage to the output The careful observer will note that each clock pulse moves only half the buckets forward preventing them from colliding with the next stage and hence the two clocks fire at different tim...

Page 6: ... Series Pedal ships with a clear plastic protector over each of the knobs Feel free to peel it off if its presence shows on the knob top The ACV 1 has a flexible bypass making it able to be used in various configurations for guitar synthesizer or line level applications including Standard pedal use ACV 1 connected into an amplifier input with or without other pedals You may use the pedal in either...

Page 7: ...op and the potential to damage your speakers or headphones To start set the ACV 1 to the Home position and take a step to the left This will produce a basic chorus sound shown in the graphics to the right Set TIME RATE AMOUNT MIX TONE to be straight up 12 00 position Set FEEDBACK knob fully counterclockwise 7 00 Set the EXP switch clockwise to RATE and set the PHASE and LFO switches to the up posi...

Page 8: ...und mixes and feeds back in phase or out of phase This difference is most pronounced with shorter settings of the time knob or higher amounts of feedback With shorter time and lots of feedback this can produce a very vocal like quality similar to a talk box It is also more pronounced on bass notes than higher pitch notes FEEDBACK The FEEDBACK knob affects how much post TONE signal is fed back into...

Page 9: ...ditional modulation devices RATE The RATE knob adjusts the speed or rate of modulation from about 0 10Hz to 15Hz wider range via control voltages Lower settings provide a slow whoosh or a rhythmic pitch shift Medium speeds provide a chorus or vibrato effect while faster rates provide a gargle or bubble sound AMOUNT The AMOUNT knob controls the depth or range of pitch movement at the speed of the L...

Page 10: ...l reinforce or cancel each other as the DELAY TIME is varied This is a normal result of mixing a steady pitch with a delayed replica of itself This phase cancelation is the chorus delay equivalent of standing waves in a reverberant room TONE The TONE knob is a continuation of Hawker s highly acclaimed ADG 1 tone control that has been re voiced slightly higher for the ACV 1 It is a modified non sym...

Page 11: ...ontrol setting selected by the EXPression switch will reduce the knob range and setting slightly Think of it as turning the knob to 1 The EXP controls are additive with their corresponding knob in that the EXP input is added to the knob For full control voltage range set the knob to the most counterclockwise CCW setting however using both you may get delay times feedback amounts LFO rate or amount...

Page 12: ... accessible option on your ACV 1 Do not adjust any of the carefully calibrated factory set trim pots Use the switch on the left side of the jack board to select true bypass Default switch to the outside of the enclosure or buffered bypass switch towards the inside of enclosure In true bypass when the effect is not engaged the input is coupled directly to the output and does not pass through any el...

Page 13: ...screte high impedance JFET input stage that can also be used as an always on buffer When engaged the preamplifier circuit provides impedance matching and gain for optimal signal to noise ratio It contains some limiting to provide character from hot signals and prevent transients from overloading the delay section The analog clock modulation oscillator and even the switch logic are all fully analog...

Page 14: ...selects Time Feedback Rate or Amount external control All controls are additive to the front panel knob adding extended range TRS jack usable with CV or Expression pedal CV range is 0 5V Ring supplied current limited 5V output Control input on Tip Bypass Footswitch effect on off user selectable True Bypass or JFET Buffered Accessible by removing ACV 1 Cover Power 9VDC 150mA 70 90mA typical Up to 2...

Page 15: ...bs except feedback near 12 00 Phase and LFO switches up Adjusting the time knob to the right will achieve a more drippy 80s chorus try adding some feedback to this Or stepping to the left a more 90s tight shimmery chorus sound Now from there It s just a tweak to the left As we dial the time to the left the chorus gets tighter and more shimmery Add some tone to enhance the sparkle Adjust the time t...

Page 16: ... flanging tones You might even be able to find that Big ol jet airliner to carry you far away Sounds awesome with some fuzz before the ACV 1 It s the LFO s thrust that really drives you insane Now it s time to go crazy on the LFO and waveshape and see what you can come up with until you re spaced out on sensation like you re under sedation Let s tweak the time warper again Keep going with it See w...

Page 17: ...slap back sound and maybe even add some feedback for a drippy meandering dance Use an expression pedal to get crazy long ring mod delays Drippy Reverberant Chorus Let s try that original chorus sound again but this time we add some feedback muted sounds to take a walk down the path to ambiance With this preset time meant nothing never would again Clouds of Mercury And for our final number this dea...

Page 18: ...ufactured Machined Assembled in the mountains of Western North Carolina Changelog Revision Date Notes Rev A 08 03 2022 Production release Rev 1 05 25 2022 Prototype manual Visit our website for more information mods hacks and presets www AshevilleMusicTools com ...