Difference between revisions of "ER-ADSR-555-01"

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* Using 1 M linear pots instead of 2.2M log pots
 
* Using 1 M linear pots instead of 2.2M log pots
 
** A, D, R pots should have been log pots
 
** A, D, R pots should have been log pots
*** [http://tomjewell.com/Technical/logpot/logpot.html#:~:text=Pots%20used%20for%20controlling%20quantities%20that%20we%20perceive,%28even%20though%20they%27re%20referred%20to%20as%20%27log%20pots%27%29. FAKING A LOG POT]
+
* All of the pots are backwards (rework below)
** Controls are are "touchy"
+
* A, D, S pots should be CCW for no delay
** Sustain pot is linear as it should be and "works" but is backwards
+
* S pot should be CW for full output
** 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
 
* ADR series resistors are 220 Ohms but should be 100 Ohms per schmitzbits note
* C3 is 4.7 uF
+
* Attack overshoots
 +
* May need > 100 ohms
 +
* C3 s/b 1 uF for the pots to have a good range
 
* Log pot curves
 
* Log pot curves
  
 
[[file:LOGPOT.jpeg]]
 
[[file:LOGPOT.jpeg]]
  
* Does not have 1M that is dashed line on schmitzbits schemati
+
* Scope capture
* ADSR controls
 
** A pot full CW
 
** D pot full CW
 
** S Pot mid
 
** R pot full CW
 
  
[[FILE:ER-ADSR-555_CAP_001.png]]
+
[[FILE:ER-ADSR-555_CAP_005.png]]
 
 
* Back off Attack just a tiny bit from CCW
 
* Rounds over the attack like it should but it is very "touchy"
 
 
 
[[FILE:ER-ADSR-555_CAP_002.png]]
 
  
 
== Benjie Jiao - DIY Modular Video ==
 
== Benjie Jiao - DIY Modular Video ==

Revision as of 00:59, 6 November 2022

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
  • 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
  • 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