ER-ADSR-555-01

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Tindie-mediums.png

Eurorack ADSR Module[edit]

ER-ADSR-555-01 Set.png

Features[edit]

  • 3U tall, 6 HP wide Eurorack module
  • Attack-Decay-Sustain-Release ADSR Module
  • Takes in Gate signal, generates CV to VCA
  • Attack, decay, and release pots control speed
    • Attack, decay, and release times can range from 200ms to 16s
  • Sustain pot sets the sustain voltage level
  • LED dims to level
  • 555 Based design

Credits[edit]

  • Benjie Jiao MiniADSR
    • Original was based on Barry Klein design
    • As built by schmitzbits design - "The Fastest Envelope in the West"
  • Benji's build has a three card stack-up and is 4 HP wide
  • This card is wider but uses 2 cards

Rev 1 Checkout[edit]

  • Ordered wrong (earlier) version of the board
    • Missing 1M decay fix resistor
    • Pots are backwards
  • Annotated schematic with Rev 1 reference designators

Adsr3 ann.png

  • Drive IN jack with Erica Synths EDU Sequencer
    • GATE Out output
  • My schematic symbols are Schottky but installed 1N4148 like schmitzbits schemati
    • A, D, R need to be log (Type A) pots
  • All of the pots are backwards (rework below)
    • A, D, S pots should be CCW for no delay
    • S pot should be CW for full output
  • ADR series resistors are 220 Ohms but should be 100 Ohms per schmitzbits note
  • Attack overshoots
  • May need > 100 ohms
  • C3 s/b 1 uF for the pots to have a good range
  • Updated Pl for above
  • Log pot curves

LOGPOT.jpeg

  • Scope capture

ER-ADSR-555 CAP 006.png

Schematics[edit]

Benjie Jiao - DIY Modular Video[edit]

Issues[edit]

Rev 2[edit]

ER-ADSR-555-01 Set REV2-720pxV.png

  • Fixed pot ends (swapped ends)
  • Added 1M decay resistor "fix" (dashed lines on Schmitz schematic)
  • Moved up S, R pots to space them up from jacks
    • Updated controls card and front panel
  • Added LEVEL legend to front panel silkscreen
  • Re-sequenced reference designators
  • Change transistor footprints to offset pins/re-oriented
  • Better spacing between parts in upper left of controls card
  • Added power supply bypass caps (1 per power pin)
  • Added URL, Rev 2 marking to rear of card

ER-ADSR-555-01 front-3d Rev1 vs Rev2-720pxV.png

Rev 1 Issues[edit]

ER-ADSR-555-01 SET P1080636-720px.jpg

  • Silkscreen has "DELAY" should be "DECAY"
  • A, D, S, R pots ends are all backwards
  • A, D, R pots should be Type A, 1M Ohms (log pots)

Cuts[edit]

  • Perform cuts before installing parts on card
  • Cut at RV1 (pins 2-3) top side

RV1 CUT.PNG

  • Cut at RV2 (pins 2-3) bottom side

RV2 CUT.PNG

  • Cuts at RV3 (pins 1, 3) top side

RV3 CUT.PNG

  • Cuts at RV4 (pins 2-3 and pin 1)

RV4 CUT.PNG top side

Change Pot Series Resistor Values[edit]

  • 220 Ohms on A, D, R pots s/b 100 Ohms (PL below is updated already for this)
    • Change R7 to 100 Ohms (A pot)
    • Change R8 to 100 Ohms (D pot)
    • Change R10 to 100 Ohms (R pot)

ER-ADSR-555 SERIES RES.png

Add wires[edit]

  • Add wires to rear of card
  • Mirrored images below (back side)
  • Add wire RV1-2 to RV1-1 (back side view)

RV1 JUMPER.png

  • Add wire RV2-2 to RV2-1 (back side view)

RV2 JUMPER.png

  • Add wire R9 left side to Sustain pot, RV3-1
  • Add wire U2-7 to Sustain pot, RV3-3

RV3 JUMPER.png

  • Add wire D3-K to RV4-3 (back side view)
  • Add wire RV4-1 to RV4-2 (back side view)

RV4 JUMPER.png

Add Release Resistor[edit]

  • Add 1M resistor top side of card

ER-ADSR-555 RELEASE RES.png

Assembly Sheet[edit]