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DIY SMR4P-MULTI  VCF  Eurorack  modul   with  black  panel 

DIY experience =middle/ hard

 black edition

Overview

 

The SMR4P-Multi contains the best from 2 worlds .  First , it sounds warm  like  the  SMR4  and second -  

15 different filtertypes  like the 4PM.

While  doing sounddesign it is very helpfull to have  a ' swiss knive' VCF.  So we implement  15 different filtertypes  like

6+12+18+24dB LP       6+12+18 dB HP          6+12 dB BP        HP2LP, HP3LP     Notch,Phaser, Notch+LP1, Phaser+LP1.

 

What else  we have build in ?

There is also a FM  posibility, an inbuild VCA  , and you can  switch the different filtertypes a:) manual   or b:)  voltage controlled.

 

What does the FM function do?

With filter FM, the audio signal is decoupled at the first filter pole and controls the filter cutoff via the FM potentiometer. Thus we have a filter frequency modulation. This gives the audio signal additional overtones. 

 

Inputs: Audio in, Res= resonance contol (0..10 V),Gain(VCA control 0..10V) , Mod (extern) and Cut(V/OCT0..10V)

Outputs : VCA  and  VCF    ***  VCA, the  output singal is contolled  in its amplitude by Gain  0..10 v

VCF  is the direct signal without  VCA controll

DIY scills :  good soldering knowledge , high integrated parts -  through hole , no SMT

 

More Informations and downloads, klick  on the text

below

 

Changes due to component shortage.

1:) styroflex capacitors 330pF instead of WIMA 330 pF

2:) Atmega 168 instead of Atmega 328

Due to the current component shortage, components may change. This does not change the functions or the sound. 

 

Technical changes 09.06.22

 

Quickstart manual SMR4P-multi

 

Assembly guide

 

SMR4P-BOM

 

SMR4P-Schematics

 

SMR4P-layout

 

Shipping-BOM

 

block diagramm

 

trouble shooting

Attention , you can order  it also ready build - special for you .This means, on request i can build one for you .

And you can choose the LED color  , green, blue , red.   

SMR4P-MULTI  - black  EDITION  out now !

available as small DIY kit, full DIY kit and assembled

Buy it , go to the shop

Some comments on MUFF  >>>> HERE

SMR4P-multi DIY kit - see please shipping BOM

Technical specs:

 

  • multimode 4 pole filter
  • 20 Hz.. 22kHz  (res 24dB)
  • max signal amp input  5V p
  • resonance control intern/ext. 0..10 v
  • cutoff control intern/ext 0..10v  V/OCT
  • modulation   ext.  0..10 v
  • inbuild filter FM
  • inbuild VCA , ext. control 0..10 v
  • 15 filtermodes available ,6+12+18+24dB LP,  6+12+18 dB HP, 6+12 dB BP, HP2LP, HP3LP,Notch,Phaser, Notch+LP1, Phaser+LP1.    voltage controlled  0..10 V
  • current  30 mA  on -12 V, 50 mA on + 12 V
  • dimensions : 50,5mmx128,5mm = 10TEx3HE  eurorack format
  • available as a DIY kit

Soundexamples/Video  SMR4P-multi

LP 6,..24 dB , no resonacy , no FM

LP 6...24 dB  FM 

HP ,  Cutoff-FM 6,12,18 dB

BP 6...12 dB  +comb Filter

Notch and Phaser

Video 1: DIY kit and sound examples

Video 2:  control different filter with  MODE in 

SMR4P-multi

side view

PCB and Pannel

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national:02368 57164

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