AMT Analoger ADG-1, User Manual

Page 1: ...100 Analog Bucket Brigade Delay User Manual Revision B Last Revision 5 03 2021 ...

Page 2: ... We then added a special blend of two tightly tuned 5th order anti alias and reconstruction filters VCA feedback control a unique 5 amp high current BBD driver and an analog clock with exponential modulation technology to obtain unprecedented sound richness clean tails and true fractional delay in a compact footprint This is the first in what we hope to be a long line of time phase and frequency c...

Page 3: ...ameras still do this today for the same reason Now they are used for audio in delays chorus and flangers The ADG 1 uses a recreation of the Matsushita Panasonic MN3005 PMOS BBD from Xvive The MN30xx series BBDs use a higher voltage for more clarity lower noise more headroom and lower distortion than the MN320x NMOS types usually found in most stomp boxes however they have lower range of delay time...

Page 4: ...ignal 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 time domain merger and mixing of the signals slightly out of time Other components also affect the sound The design of the companding and emphasis de emphasis network designed to improve the signal to noise ratio affects the animation breathing overshoot and ti...

Page 5: ... by Geoff have a historical background In the 1990s Panasonic released an applications note and data sheet book for their BBDs and Digikey used in their marketing On the cover and back of this book was a picture of firemen in a bucket brigade line This represents the BBDs function of passing the sound from one capacitor or bucket to another 4096 times before it goes out 8192 times for us by varyin...

Page 6: ...knobs Feel free to peel this off if artifacts from its presence show on the knob top The ADG 1 has an input level control and flexible bypass making it able to be used in various configurations for guitar synthesizer or line level applications including Standard pedal use ADG 1 connected into an amplifier input with or without other pedals You may use the pedal in either Buffered or True bypass mo...

Page 7: ...damage your speakers or headphones Note If not using the expression input be sure the expression switch is NOT SET TO THE TIME POSITION to start We recommend setting it to AMT if not using this feature To start set the ADG 1 to the Home position as shown in the graphics to the right Set TIME MIX TONE straight up 12 00 Set FEEDBACK RATE AMOUNT switch fully counter clockwise 7 00 Set DRIVE slightly ...

Page 8: ...ravels through 1 or 2 BBDs 4096 or 8192 stages and so halves or doubles the delay time 17 350mS vs 35mS 700mS While there clearly is some overlap in the settings as you can often get the same delay time from either setting the tone is slightly different in each so you may prefer one position over the other In general use the down position for long reverberant delays Use the up position for more sp...

Page 9: ...ob easier to adjust and dial in an exact MIX Note If you are applying a sustained steady pitch to the ADG 1 and have the MIX knob set near 12 00 you may find that the direct and delayed signals alternately reinforce and cancel each other in rapid succession 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 an...

Page 10: ...E The RATE knob adjusts the speed or rate of modulation from about 0 08Hz to 40Hz wider range via control voltages Lower settings provide a slow whoosh or a rhythmic pitch shift Medium speeds are a chorus like effect while faster rates provide a gargle bubble or vibrato sounds AMOUNT The AMOUNT knob controls the range of pitch movement at the speed of the LFO or the amount of effect Use low amount...

Page 11: ...itch will reduce the minimum knob setting slightly The FEEDBACK RATE AMOUNT control voltages are additive CV is offset from knob position This means that the knob position is added to the expression position For full control voltage range set the knob to the most Counter Clock Wise CCW setting TIME behaves differently as it is bi polar This means that as the TIME level is decreased around a 2 5V m...

Page 12: ...your ADG 1 you will see 2 switches underneath the jack board on the edges of the PCB These are the ONLY user accessible options on your ADG 1 They select two functional options for the pedal s behavior Do not adjust any of the carefully calibrated factory set trim pots TRUE BYPASS BUFFERED BYPASS Use this switch on the left side of the jack board to select true bypass Default or buffered bypass In...

Page 13: ...lifier consists of a discrete high impedance JFET input stage that can be used as an always on buffer The preamplifier circuit provides gain and impedance matching or can be used to overdrive the delay line and mixer section for unique artifacts and character that only an analog delay can provide The analog clock generation modulation oscillator and even the switch logic are all fully analog Our V...

Page 14: ... 44dB dry Tone 605Hz center tilt like filter Center Flat to 0 25dB High 5dB 12dB Low 4dB 7dB Bucket Toggle 1 or 2 BBDs 4096 or 8192 buckets LFO toggle Rounded Triangle slewed Square wave or OFF Bypass Footswitch effect on off user selectable True Bypass or JFET Buffered Tails Mod Footswitch User selectable modulation kill or engage tails bypass sometimes called Spillover Expression Switch 4 positi...

Page 15: ...V range is 0 5V Ring supplied current limited 5V output Control input on Tip Delay Time 35mS 700mS Dual BBD mode 17mS 350mS single bucket mode 24mS 900mS with LFO or Control Voltages Input impedance 1MΩ Output impedance 1KΩ Max 5k max for buffered bypass Max input level 15dBµ 4 3V RMS Max output level 14dBµ 3 9V RMS Maximum drive 23dB covers attenuation to gain Noise Reduction 2 1 broadband with 1...

Page 16: ...an even more aggressive sound or dial it back and try it with arpeggios Cavernous Hallway Hello Hello Hello Is there anybody in there Do we have an echo in here Reverberant echoes Try dialing up some modulation for more fun Modulation off Fold Under low pass Delay Long repeat delay where each echo slowly becomes less and pronounced as it fades out Each repeat loses detail and folds under your mix ...

Page 17: ...k your parents about 16mm school projectors Faux Flanger Phased hollow delay with peaky and present movement It is similar to a Flanger yet with longer delay times Adjust the FEEDBACK to find that sweet spot right before oscillation and the AMOUNT to bring out the tone the best Wet Pseudo Chorus A long drippy lush chorused sound with longer than average delay times Dial in RATE and AMOUNT until yo...

Page 18: ...end of a tunnel talking through an old telephone Modulation off Square Jumps Tune this by ear using AMOUNT and TIME controls for a bouncy whimsical octave echo or a chaotic atonal warble Tape Wash Bright repeats fade away into the ether No motor repair necessary Wow others with the flutter Modulation off ...

Page 19: ... off Alternatively try a hair of modulation with RATE around 12 00 and just a hair on the AMOUNT knob Lofi Vibes Take advantage of the ADG 1 s lush filter to construct a lo fi vibrato evocative of vintage recordings Slap Back Delay Short delay doubling Chicken Pickin and finger licken good Modulation off ...

Page 20: ...a Changelog Revision Date Notes Rev B 4 30 2021 Small updates and clarifications for Rev B PCB Rev A1 12 28 2020 Production Web Release Small formatting and typo fixes Rev A 12 12 2020 Pre Production Release Rev 1 11 20 2020 Prototype Manual Visit our website for more information mods hacks and presets www AshevilleMusicTools com ...