CV Trigger Section

Jack J1 : Analog Trig IN (connect to trig out of a vintage drum machine)

Jack J2 : Analog Clock IN (24ppqn, SYNC24)

 

The CV trigger section allows you to connect the TRIG OUT of a vintage drum machine in order to control the arpeggiator clock. You access the trigger on the front panel through Jacks J1 & J2. Then a circuit made of Zener diodes limits voltage to +5.1V to protect the inputs of the arduino board.

The trigger must be an electrical short pulse signal between +5V and +15VDC (typical output of a TR808 or TR707). You can try with analogue audio but the envelop is certainly too long (even on rimshot or clave) ; you need a dirac.

 

 

 

 

 

On PCB prior to rev1.4 you need to use Dupont wires to connect the trigger circuit to the arduino.

 

 

With PCB rev1.4 you simply set jumpers on CV1 and CV2 to connect the Jacks J1 & J2 to the arduino (faster and easier).

 

 

 

 

 

 

Recent Posts

Matrix Ctrlr 1.38 update

There is a long time we have published some news !

We (or should say “I” as alpesmachines is a single guy project) have been focused on daily life things and a regular job but some prototyping projects should be exposed in the next weeks …

We have also invest some time to enhance the Matrix Ctrlr and you can find the latest revisions 1.38 on Github here :

  • One major improvement is a faster display librarian : all the micro delays induced by printing on the display have disappeared. You can trigger very short notes and move all the parameters together now : beware to the musical results !
  • ARP Menu : now you can set the split point in between the arpegiated section and the sequenced one with a midi learn : simply press KEY2 under SPLT and send a midi note to define the split point. A customer request !
  • We have also improved the ADC stability by using a moving average method to filter power supply noise and thus having a more stable reading of the potentiometers. It can be access under the CFG/MISC/JTR parameter. A lower value uses lots of filtering (drawback the calculus is longer so the printed value is a little delayed) while a higher value is more responsive and sensitive to noise. The value can be set by pressing KEY4 and saved with PAGE. Now you can use a very bad quality power supply if you like.

We still have a few kits in stock and you need to order a Matrix Ctrlr ECO kit + assembly service to have a ready to use unit.

We recommend to have firmware 1.20 or 2.15 inside your Matrix 1000 or Matrix 6 : we provide Oberheim EPROM if necessary.

 

 

There are also Stereo One-O-Six Chorus kits in stock, a nice companion to add wide stereo effect to a mono synthesizer !

We wish you all the best and enjoy the unlockdown freedom !

 

julien

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