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
  • Re-create ordered board in Rev 1 folder
  • Annotated schematic

Adsr3 ann.png

  • Drive with Erica Synths EDU Sequencer
    • GATE Out output
    • At slowest speed, ~2Hz
  • My schematic symbols are Schottky but installed 1N4148 like schmitzbits schemati
  • Using 1 M linear pots instead of 2.2M log pots
    • A, D, R pots should have been log pots
    • Controls are are "touchy"
    • Sustain pot is linear as it should be and "works" but is backwards
    • All of the pots are backwards
      • A, D, S pots should be CCW for no delay
  • ADR series resistors are 220 Ohms but should be 100 Ohms per schmitzbits note
  • C3 is 4.7 uF
  • Log pot curves

LOGPOT.jpeg

  • Does not have 1M that is dashed line on schmitzbits schemati
  • ADSR controls
    • A pot full CW
    • D pot full CW
    • S Pot mid
    • R pot full CW

ER-ADSR-555 CAP 001.png

  • Back off Attack just a tiny bit from CCW
  • Rounds over the attack like it should but it is very "touchy"

ER-ADSR-555 CAP 002.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 new build

Cuts

  • Cuts before build
  • Cuts to RV1 (pins 2-3)

RV1 FIX.PNG

  • Cuts to RV2 (pins 2-3)

RV2 FIX.PNG

  • Cut to RV3

RV3 FIX.PNG

  • Cut to RV4

RV4 FIX.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)

Add wires

  • Add wire R10 left side to Sustain pot, RV3 right side
  • Add wire U2-7 to Sustain pot, RV3 left side
  • Add wire RV1-2 to RV1-1
  • Add wire RV2-2 to RV2-1
  • Add wire R10 to RV4-3
  • Add wire RV4-1 to RV4-2

Assembly Sheet

ER-ADSR-555-01 Rev 1 Assembly Sheet