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====== EASY CV ======

Test Equipment: CV-Destination MB33 MAM:
{{:phatline:easy-cv-testequipmentv1.jpg?300|}}


===== Introduction =====
Digital created LFO+ENV with CV-Output.
No Displays, No Menues, Minimal buttons, much Scopes, much Led-Ring-Rotarys (Planed for LRE-8x2CS), one big UI with complete functions for one LFO+ENV Voice... switching between the UI-Voices is done from the BREAKOUTMODULES...to this later

LFO+ENV are mixed together softwareside, to use only one CV-Output\\
8xCV-Outputs (VOICES) are supported > if u are on a VCF+VCA-Setup = 4 Voices on the Analog-Side (4xFilterbank)\\
Copy Paste for LFOs and ENVelopes between the Voices\\
Copy Paste for a Songa aka Preset aka Bank aka Program(change)\\
Jam Style Pattern load (next Preset Display) + Preset Morph between Current-Preset and Next-Preset\\

A Breakoutmodule for each CV-Output, with Depth-rotary, Focusswitch (Pushrotary), 2x Scopes (LFO+ENV) and LFO/ENV-Switch to show on one Display the Mixed Waveform & to switch the Rotary to "ENV" or "LFO" Mode (there is only space for one Encoder - maybe just make PAN Style, instead of 2 individual level -maybe more live feel?, how ever when using an 3Stage switch, i could disable MIX-View, or display it on ENV or LFO...maybe a good choise ;) )
The Depth-rotary has no Ledring, want to display it as a bar or as Value in the scope...

Whole thing will not be compatible on MB-CV concepts... i will copy code snippets and so on, but i have to understand it from scratch... anyhow this is not generic
===== FrontPanel =====
==== Brain ====
__THE **LEFT** SIDE of the BRAIN  >  Preset-Management:__
**Save** & **Load** the PROGRAM, can be done by Midi-ProgramChange -or With the LOAD-**PRESET**-Encoder\\
then press **LOAD** -or **Morph** to the next Program slowly with the MORPH-Encoder\\
-Another option is to take a **PUSH-ENCODER** for **LOAD** & **STORE** > and load and store it by pushing it... would free 2 buttons for other functions.\\
MORPH?:  \\
-The Upper 7 Segment LED- Display: is the **LOAD Display** indicate the new Program with ENV+LFO
-The downer7 Segment LED- Dsipaly: is the **STORE Display** it indicates also the current Program with ENV+LFO\\  
--with morph you crossfade between both Presets (be carefull, first Store the current Preset\\
**Paste** & **Copy** do their job @ the whole PROGRAM Memory\\     
**ENV-PASTE** & **ENV-COPY** do their job @ the selected Envelope > (ENV-Voice selection is done by the breakout Modules) ... LFO..same\\

Midi-Channel Note NR or Number of Envelope is a real programmer job (C), with usb-upload from computer
.... this is a individual device, and once set, it has to play > and it just should do LFOs and Envelopes
Fixed routed, no generic, special  > in my case for a filterbank.
{{ :phatline:Easy-CV-BRAIN.png?direct&900 |}} 
__THE **RIGHT** SIDE of the BRAIN  >  LFO + ENV Settings (one Voice):__
ADSR with:\\
**CURVE** Paremter which give exponentially to it (no straight lines While Fall and Rise)\\
**Short:** just shorten the Maximal lenght of a Envelope, haveing more Feeling on Encoders
should change Scope Display also... \\
**LFO:** get synced with Midi, and there is a retrigger by Notes...\\
**Phase:** offsets the start-Phase \\
**Delay:** simple delay (nte-Trig)\\
**Rate:** clear from 8 wholes to 128th or so\\
**Wave:** access to the Waveforms\\
**Duration:** interpret Midisync in trippled, whole notes or whatever...\\ 

**DEPTH:** is the maximal Value of FALL and RISE and SUSTAIN, i know i loose resolution with this...but i have to have a memory filterbank,...doing depth instead with Potentiometers on Filtermodules... would give no memory...

==== BreakOut ====
1. Discharged UserInterface for the Brain in "Island mode" (Scopes + Digital-CV-Amount)\\
2. CV-Breakout EuroModule to be located near the CV-Destination (example: a Filter).\\
2 Waveforms (ENV+LFO) are mixed together softwareside\\
that bring 2 advanteges:\\
1.save one CV-Output\\
2. the Amplitude of each Waveform is saved in the patch, so the CV-Amount to a Filter is saved in the Patch\\
That bring 2 disadvanteges:\\
1.LFO or ENV cant get patched to individual destination\\
2.the Resulution gets lower 2 very low, and the code has to be adptet much... or have to be made from scratch
Because I use the device for a Memory-Filterbox (VCF+VCA), i am ok with the pros and cons, so  i call it EASY-CV\\
{{ :phatline:Easy-CV-BREAKOUT.png?direct&130 |}} 
**Envelope Scope:** show the ENV-Waveform \\
or the Mixed-CV-Output-Waveform (when Switch is in LFO Mode)\\ 
and show the Envelope-Amount with a BAR or as numeric Value?\\
**MIXED CV Plug:** CV-Output > Mixed Waveform ENV+LFO\\
**Switch @ ENV:**\\
  -Depth-Encoder change ENV Amount of the CV-MIX\\
  -ENV Scope will show ENV Wave\\
  -LFO Scope will Show CV-Mix\\
**Switch @ LFO:** visa versa ENV\\
Press the Encoders built in **ENCODER-BUTTON**:\\
will switch the BRAIN-A-D-S-R and L-F-O ENCODER to the Page for THIS Module...\\ 
workflow, see what you have with a Scope, over a filter, and edit exact this selected CV on the brain in full detail...

==== VCA-VCF ====
THE VCA and the VCF are controlled with each one CV - each CV has a LFO and a ENVELOPE digitaly mixed... fixed in routing.\\
{{ :phatline:Easy-CV-VCA-VCF.png?direct&260 |}} 
basicly a simple VCA (MS20Like) that drives the input of a Audio transformator 1:3 which is a Neutrik NTE10-3 (9€)\\
this "Tesla" Hi Gain - goes now thru the Post-VCA-Gain-Potentiometer - which then overdrives the 303 Filter (my prototype was a Freebase 383)\\
sound now goes to the Post-VCF-Gain-Potentiometer\\
now sound goes into a OP-Amp - to have the change for a light overdrive\\
From this point a EFX-Send Potentiometer send the Processed Signal to a extra Output (EFX-Send)\\
With the +DRY-Switch,  we switch the orginal Signal additional to this EFX-Send-Potentiometer (or not)\\
Parallel to the EFX-Send Potentiometer is the DRY/WET Potentiometer it Pan between Orginal and Filtered Sound.\\
after DRY/WET come the Volume-knob and the Audio outs...\\

=== Original Schematics 303 - VCA-VCF ===
{{ :phatline:VCA-VCF-303-orginal.png?direct&900 |}} 

=== Mod Sources ===
FIXME Fill with 303 mods
take orginal VCA (have a bunch of this ICS) or make MB33 Style with standart components...

In order to not use those **overprized MATCHED-PAIR-TRANSISTORS** (over 2€ on the cheapest place) i have to use standart Transistors and make a **VBE-MATCH** on my own, i have already a PCB from here - to measure the transistors with a Multimeter:
https://midisizer.com/other/vbe-matching/

==== Example for a Filterbank ====
Here are 8Envelopeś 4xfor VCF 4xfor VCA... in fact there could be used more then this for example 8xVCF and 8xVCA...since the BREAK-OUT-Modules are Modular, and they share the same "Main-UI"...the only limiting factor is the CODE...i am not a C-Guru, and maybe i will still have timing problems with 8x CV-Outs...we will see.
{{ :phatline:Easy-CV-Example.jpg?direct&900 |}} 
**I will use it to filter:**\\
2xGuitar-Loopstations\\
1xGuitar\\
1xPercussion-Master\\

===== General Design =====

The panel size is 3U, Eurorack compliant 

==== FrontPanel ====

==== PCBs ====

The Analog Circuits (VCF+VCA) get sandwitch as normal (not90° angeled) \\

Left-Part of the Brain on Breathboard: \\
7Segment: LTS547AP \\
Button: ShadowSE/ITT \\
{{:phatline:proto-preset.jpg?400|}}

==== 3D View of Sandwitches ====

FIXME make concept

==== 1. UI Parts Listing  ====

=== BRAIN + BREAKOUT ===
  * [[https://www.thonk.co.uk/shop/3-5mm-jacks/| Jacks 3.5mm @ Thonk]]
  * [[http://at.rs-online.com/web/p/kippschalter/7347145|SPDT Switch ON-OFF-ON @ Rs-components]]

^ Value     ^  Type                    ^ Qty  ^
|3.5mm Jack |Vertical PCB-Mount        |13    |
|Switch     |SPDT Vertical PCB-Mount ON-OFF-ON   |1     |
FIXME Fill Table

=== Pots / Knobs ===

  * [[http://www.alps.com/prod/info/E/HTML/Potentiometer/RotaryPotentiometers/RK11K11/RK11K11_list.html|Alps RK11K Series]]
  * [[https://www.thonk.co.uk/shop/alpha-9mm-pots/|Alpha Pots @ Thonk]]
  * [[where_to_order_components#knobs|Knobs Suppliers]]
  * FIXME need special 4gang 50KB potentiometers for a STEREO Resonance (stereo filter, one UI)
  * FIXME need special 4gang xxKB (50?) potis for a Stereo DRY/WET Mix
  * FIXME need special 2gang xxKB (50?) potis for EFX Send Mix Stereo
  * FIXME need special 2gang 50KA       potis for CUT-OFF Stereo
  * FIXME need special 2gang Post Transformator Potentiometer (Value have to look in my prototype which is used)

^ Value   ^  Type          ^ Qty  ^
|5K       |Linear          |x     |
|10K      |Linear          |x     |
|50K      |Linear          |x     |
|50K      |Logarithmic     |x     |
|100K     |Linear          |x     |
|1M       |Linear          |x     |
|2M?      |Linear          |x     |
|Knobs    |Soft/Plastic/Alu|x     |


==== 2. Analog Parts Listing ====

=== VCA-VCF-Board ===

FIXME Fill Table

==== 3.Footprint Making in KiCAD ====

  * ALPS Pots
  * Alpha Pots
  * 3,5mm Jack
  * Switch
  * Momentary Switch
  * 7 Segment LED Display
  * OLED DIsplay
  * Rotary Encoder
FIXME have to be done

==== 4. Schematics in KiCAD ====

FIXME have to be done

==== 5.PCB Making In Kicad ====

=== PCB Making Order ===
- BRAIN PCBs:\\
 a.Left-Brain\\
 b.Right-Brain\\
- LRE8x2CS - is a generic PCB which i already have (fairlightiiś)\\
- BREAKOUT PCBs (maybe have to sandwitch because of shiftregisters and less space)\\
- FILTER PCBs (have to sandwitch)\\
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