Difference between revisions of "ER-VCA2-01"

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[[FILE:ER-VCA2-01-CTRLS_REV1_SET-3d-720PX.png]]
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[[File:tindie-mediums.png|link=https://www.tindie.com/products/28610/]]
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[[FILE:ER-VCA2-01_SET_P1080800-720PX.jpg]]
  
 
== Features ==
 
== Features ==
  
−
* Dual VCA
+
* Eurorack card
−
* Adjust between VCA and Mod
+
** 3U tall
−
* 3U tall
+
** 6HP wide
−
* 6HP wide
+
** 3 card set
−
* 3 card set
+
* Dual Voltage Controlled Amplifier (VCA)
 
* LM13700 based
 
* LM13700 based
−
* Eurorack
+
** [https://www.mouser.com/ProductDetail/926-LM13700N-NOPB LM13700 Operational Transconductance Amplifier]
 +
* Pots adjust between input and Mod jacks
 +
** CW - output is fully controlled by MOD jack
 +
** CCW - output is not controlled by MOD jack
 
* +/- 12V Power, 10-pin power connector
 
* +/- 12V Power, 10-pin power connector
 +
 +
=== Credits ===
 +
 +
* Based on HAGIWO's [https://note.com/solder_state/n/n3357199504d8 LM13700 Dual VCA - Modular Synth Made for 550 Yen]
 +
 +
== Connectors ==
 +
 +
=== J1 - Daughtercard Pots ===
 +
 +
[[file:ER-VCA2-01-DB_J1.PNG]]
 +
 +
* POT1 = RV1 = Modulation Adjust Channel 1
 +
* POT2 = RV2 = Modulation Adjust Channel 2
 +
 +
=== J2 - Daughtercard Eurorack Power ===
 +
 +
[[file:ER-VCA2-01-DB_J2.PNG]]
 +
 +
=== J3 - Daughtercard Control Card Jacks ===
 +
 +
[[file:ER-VCA2-01-DB_J3.PNG]]
 +
 +
* Controls card J3 = OUT1 (bottom left jack)
 +
* Controls card J4 = OUT2 (bottom right jack)
 +
* Controls card J5 = MOD1 (middle left jack)
 +
* Controls card J6 = MOD2 (middle right jack)
 +
* Controls card J7 = IN1 (top left jack)
 +
* Controls card J8 = IN2 (top right jack)
  
 
== Reference ==
 
== Reference ==
  
 
* [http://musicfromouterspace.com/analogsynth_new/DUALVCA/DLLVCA001.html Dual Log/Linear VCA] - Article by Ray Wilson
 
* [http://musicfromouterspace.com/analogsynth_new/DUALVCA/DLLVCA001.html Dual Log/Linear VCA] - Article by Ray Wilson
 +
** Has adjustment procedure
 +
* [https://electricdruid.net/design-a-eurorack-vintage-vca-with-the-lm13700/ Design a Eurorack “Vintage VCA” with the LM13700] - Electric Druid
 +
 +
== Video ==
 +
 +
<video type="youtube">RrAa7nboG-o</video>
 +
 +
<video type="youtube">AVIHLjFpuUA</video>
 +
 +
<video type="youtube">oj0CkBRADpY</video>
 +
 +
== Checkout ==
 +
 +
=== Rev 2 Daughtercard ===
 +
 +
* Works
 +
 +
=== Rev 2 Controls card ===
 +
 +
* Updated Controls card
 +
* Using Rev 1 Analog daughtercard
 +
* Headers line up
 +
* Tested as set
 +
* View from rear side
 +
 +
[[file:ER-VCA2-01_SET_P1080806-720PX.jpg]]
 +
* Output clipping below 0V, missing 510K resistors between LM13700 out and Transistors set
 +
** Add 510K on back side U2-12 to U2-13
 +
** Add 510K on back side U2-4 to U2-5
 +
** Works much better, no clipping
 +
* Created rev 2 daughtercard that incorporates resistors
 +
 +
=== Rev 1 ===
 +
 +
* Headers between cards do not line up
 +
** Fix on Controls card
 +
*** Make Rev 2 Controls card
 +
*** Move down bottom header J2 to match daughtercard
 +
** Cut off 0.1" of controls card using vice/hacksaw
 +
** Use female headers on bottom of daughtercard
 +
** Use right angle pin header pins to connect to pads (remove plastic)
 +
* Not shipping this version on Tindie
 +
 +
[[FILE:ER-VCA2-01-CTRLS_CONN_RWK.png]]
  
 
== Assembly Sheet ==
 
== Assembly Sheet ==
  
−
* [[ER-VCA2-01 Rev 1 Assembly Sheet]]
+
* Two revs of Daughtercard
 +
** Rev 1 shipping (ships on Tindie starting 2022-11)
 +
** Rev 2 future version which will incorporate resistor rework
 +
* Two revs of Controls card
 +
** Rev 2 ships (Tindie)
 +
 
 +
=== Rev 2 Daughtercard, Rev 2 Controls Card ===
 +
 
 +
* Future version
 +
* [http://land-boards.com/ER-VCA2-01/ER-VCA2-01-CTRLS_Rev2_ibom.html ER-VCA2-01 Rev 2 Controls Card Interactive BOM]
 +
* [http://land-boards.com/ER-VCA2-01/ER-VCA-01-DB_Rev2_ibom.html ER-VCA2-01 Rev 2 Daughtercard Interactive BOM]
 +
* [[ER-VCA2-01 Rev 2 Assembly Sheet]] - Includes rework to add resistors
 +
 
 +
=== Rev 1 Daughtercard, Rev 2 Controls Card ===
 +
 
 +
* Current version on Tindie
 +
** Requires 2 additional resistor on rear of daughtercard
 +
* [http://land-boards.com/ER-VCA2-01/ER-VCA2-01-CTRLS_Rev2_ibom.html ER-VCA2-01 Rev 2 Controls Card Interactive BOM]
 +
* [http://land-boards.com/ER-VCA2-01/ER-VCA-01-DB_Rev1_ibom.html ER-VCA2-01 Rev 1 Daughtercard Interactive BOM] - Requires rework to add resistors
 +
* [[ER-VCA2-01 Rev 2 Assembly Sheet]] - Includes rework to add resistors
 +
 
 +
=== Rev 1 Daughtercard, Rev 1 Controls Card ===
 +
 
 +
* [[ER-VCA2-01 Rev 1 Assembly Sheet]] - Requires rework to add resistors
 +
* [http://land-boards.com/ER-VCA2-01/ER-VCA-01-DB_Rev1_ibom.html ER-VCA2-01 Rev 1 Daughtercard Interactive BOM] - Requires rework to add resistors

Latest revision as of 00:25, 31 January 2023

Tindie-mediums.png

ER-VCA2-01 SET P1080800-720PX.jpg

Features

  • Eurorack card
    • 3U tall
    • 6HP wide
    • 3 card set
  • Dual Voltage Controlled Amplifier (VCA)
  • LM13700 based
  • Pots adjust between input and Mod jacks
    • CW - output is fully controlled by MOD jack
    • CCW - output is not controlled by MOD jack
  • +/- 12V Power, 10-pin power connector

Credits

Connectors

J1 - Daughtercard Pots

ER-VCA2-01-DB J1.PNG

  • POT1 = RV1 = Modulation Adjust Channel 1
  • POT2 = RV2 = Modulation Adjust Channel 2

J2 - Daughtercard Eurorack Power

ER-VCA2-01-DB J2.PNG

J3 - Daughtercard Control Card Jacks

ER-VCA2-01-DB J3.PNG

  • Controls card J3 = OUT1 (bottom left jack)
  • Controls card J4 = OUT2 (bottom right jack)
  • Controls card J5 = MOD1 (middle left jack)
  • Controls card J6 = MOD2 (middle right jack)
  • Controls card J7 = IN1 (top left jack)
  • Controls card J8 = IN2 (top right jack)

Reference

Video

Checkout

Rev 2 Daughtercard

  • Works

Rev 2 Controls card

  • Updated Controls card
  • Using Rev 1 Analog daughtercard
  • Headers line up
  • Tested as set
  • View from rear side

ER-VCA2-01 SET P1080806-720PX.jpg

  • Output clipping below 0V, missing 510K resistors between LM13700 out and Transistors set
    • Add 510K on back side U2-12 to U2-13
    • Add 510K on back side U2-4 to U2-5
    • Works much better, no clipping
  • Created rev 2 daughtercard that incorporates resistors

Rev 1

  • Headers between cards do not line up
    • Fix on Controls card
      • Make Rev 2 Controls card
      • Move down bottom header J2 to match daughtercard
    • Cut off 0.1" of controls card using vice/hacksaw
    • Use female headers on bottom of daughtercard
    • Use right angle pin header pins to connect to pads (remove plastic)
  • Not shipping this version on Tindie

ER-VCA2-01-CTRLS CONN RWK.png

Assembly Sheet

  • Two revs of Daughtercard
    • Rev 1 shipping (ships on Tindie starting 2022-11)
    • Rev 2 future version which will incorporate resistor rework
  • Two revs of Controls card
    • Rev 2 ships (Tindie)

Rev 2 Daughtercard, Rev 2 Controls Card

Rev 1 Daughtercard, Rev 2 Controls Card

Rev 1 Daughtercard, Rev 1 Controls Card

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