ER-ADSR-555-01

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Eurorack ADSR Module

ER-ADSR-555-01 Set.png

Features

  • Attack-DeCay-Sustain-Release Eurorack 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
  • 3U tall, 6 HP wide
  • 555 Based design
  • 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

  • Ordered wrong (earlier) version of the board
    • Missing 1M decay fix resistor
  • Re-create ordered board in Rev 1 folder
  • Annotated schematic

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 005.png

Benjie Jiao - DIY Modular Video

Issues

Rev 1 Issues

  • Silkscreen has "DELAY" should be "DECAY"
  • A, D, S, R pots are all backwards
  • A, D, R pots should be A1M
  • Made 2nd card

Cuts

  • Cuts before assembling parts on card
  • Cuts to RV1 (pins 2-3)

RV1 CUT.PNG

  • Cuts to RV2 (pins 2-3)

RV2 CUT.PNG

  • Cut to RV3 (pins 1, 3)

RV3 CUT.PNG

  • Cuts to RV4 (pins 2-3 and pin 1)

RV4 CUT.PNG

Change Pot Series Resistor Values

  • 220 Ohms on A, D, R pots s/b 100 Ohms
    • 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

  • 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

  • Add 1M resistor

ER-ADSR-555 RELEASE RES.png

Assembly Sheet

ER-ADSR-555-01 Rev 1 Assembly Sheet