Difference between revisions of "ER-VCA2-01"
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* [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 | ** 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 == | ||
| Line 60: | Line 61: | ||
== Checkout == | == Checkout == | ||
| − | === Rev 2 === | + | === Rev 2 Daughtercard === |
| + | |||
| + | * Works | ||
| + | |||
| + | === Rev 2 Controls card === | ||
* Updated Controls card | * Updated Controls card | ||
| Line 73: | Line 78: | ||
** Add 510K on back side U2-4 to U2-5 | ** Add 510K on back side U2-4 to U2-5 | ||
** Works much better, no clipping | ** Works much better, no clipping | ||
| + | * Created rev 2 daughtercard that incorporates resistors | ||
=== Rev 1 === | === Rev 1 === | ||
| Line 83: | Line 89: | ||
** Use female headers on bottom of daughtercard | ** Use female headers on bottom of daughtercard | ||
** Use right angle pin header pins to connect to pads (remove plastic) | ** 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]] | [[FILE:ER-VCA2-01-CTRLS_CONN_RWK.png]] | ||
Latest revision as of 00:25, 31 January 2023
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
- Based on HAGIWO's LM13700 Dual VCA - Modular Synth Made for 550 Yen
Connectors
J1 - Daughtercard Pots
- POT1 = RV1 = Modulation Adjust Channel 1
- POT2 = RV2 = Modulation Adjust Channel 2
J2 - Daughtercard Eurorack Power
J3 - Daughtercard Control Card Jacks
- 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
- Dual Log/Linear VCA - Article by Ray Wilson
- Has adjustment procedure
- Design a Eurorack “Vintage VCA” with the LM13700 - Electric Druid
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
- 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)
- Fix on Controls card
- Not shipping this version on Tindie
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
- ER-VCA2-01 Rev 2 Controls Card Interactive BOM
- 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
- ER-VCA2-01 Rev 2 Controls Card Interactive BOM
- 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
- ER-VCA2-01 Rev 1 Daughtercard Interactive BOM - Requires rework to add resistors
