View source for ER-VCF-02

[[FILE:ER-VCF-02_f-b_720px.jpg]]

== Features ==

* This is a diode ladder VCF - original design by Moritz Klein, with a couple of small adaptions made by [https://github.com/tkilla64/eurorack/tree/main/diode-vcf T Killa]
* There are two CV inputs
** CV1 with an attenuator to control the amount
** CV2 with an attenuverter so it's possible to invert the signal as well as controlling the amount of modulation
* The filter is a low-pass filter only
* 3U tall
* 6 HP (30mm) wide
* Uses [[ER-PROTO-02]] controls cards

=== Credits ===

* [https://github.com/tkilla64/eurorack/tree/main/diode-vcf Tommy Killander Design]

== Pots/Connectors ==

=== Front Panel Pots ===

* POT RV1 - CV1 Attenuator adjustment
* POT RV2 - CV2 Attenuaverter adjustment
* POT RV3 - Not used
* POT RV4 - Not used
* POT RV5 - Resonance adjustment
* POT RV6 - Cutoff Frequency adjustment

==== POT RV1 - CV1 Attenuator adjustment ====

==== POT RV2 - CV2 Attenuaverter adjustment ====

==== POT RV5 - Resonance adjustment ====

==== POT RV6 - Cutoff Frequency adjustment ====

=== Front Panel External Connectors ===

* J3 - Audio In
* J4 - CV Amount
* J5 - Attenuaverter input
* J6 - Audio Out

==== J3 - Audio In ====

* 3.5mm mono connector
* Tip - signal

==== J4 - CV Amount ====

* 3.5mm mono connector
* Tip - signal

==== J5 - Attenuaverter input ====

* 3.5mm mono connector
* Tip - signal

==== J6 - Audio Out ====

* 3.5mm mono connector
* Tip - signal

=== Analog Card Connectors ===

==== J1 - Eurorack Power ====

[[file:ER-VCF-02-DB_J1.PNG]]

==== J2 - POT (from Controls card) ====

[[file:ER-VCF-02-DB_J2.PNG]]

==== J3 - Jacks (to/from Controls card) ====

[[file:ER-VCF-02-DB_J3.PNG]]

== Schematics ==

[http://land-boards.com/ER-VCF-02/ER-VCF-02_REV1_Schematic.pdf ER-VCF-02 REV 1 Schematic]

== Issues ==

=== Rev 1 ===

* No issues, working

== Videos ==

<video type="youtube">GX_bh88I6nM</video>

* Design base on Low Pass only version of Moritz Klein's design

<video type="youtube">jvNNgUl3al0</video>

<video type="youtube">tWKLFcc_BJM</video>

* Not Voltage controlled, but interesting
** Chapter 11.7 of [http://www.dissidents.com/resources/OperationalAmplifiersAndLinearICs_3E.pdf Op Amps Textbook]

<video type="youtube">esKrrjFJyuk</video>

<video type="youtube">cJORc8inK9Q</video>

== Assembly Sheet ==

* Three card set
** Front Panel
** [[ER-PROTO-02]] Controls card
*** RV1, RV2, RV5, RV6 (No RV3, RV4)
*** J3-J5
** Analog card

* [http://land-boards.com/ER-VCF-02/ER-VCF-02-DB_REV1_ibom.html ER-VCF-02 Rev 1 Interactive BOM]
* [[ER-VCF-02 Rev 1 Assembly Sheet]]