One-O-Six Chorus

One-O-Six Chorus

A box based on Roland Juno Chorus circuit with Rate and Depth controls.

Use MN3009 or MN3007 and a DC-DC step up inverter to get genuine Rolandish tone.

History :

It all started with this in 2011 : a Roland Juno Chorus board inside a 1U rack with a potentiometer to change the LFO rate + a dedicated dual power supply section + a Line level input stage.

The front panel and PCB we designed in April 2019 to fit a Hammond 1590XX enclosure :

Compare genuine Roland Juno Chorus to the Stereo One-O-Six Chorus :

background-noise-one-o-six

Technical specs :

  • Full analogue signal path !
  • use genuine MN3009 or MN3007 PMOS BBDs
  • true Stereo Chorus effect (180° phase rotation)
  • Modulator LFO Rate/Depth controls
  • LFO rate based on Juno 106 I & II position
  • external source to replace LFO
  • Direct Mute to use the One-O-Six as an AUX effect with a mixer
  • 15dB range VU Meter
  • Input level control for optimal signal
  • Line level input : 0dBu
  • Mono 1/4″ TS Jack input
  • Line level Output : 0dBu
  • Stereo 1/4″ TS Jack outputs
  • S/N : 85dB
  • genuine 3W DC/DC step-up inverter inside to achieve similar voltage of the Juno
  • power : typically 9VDC 2.1mm barrel center negative (7-12VDC compatible, similar to stompbox )
  • power consumption on 220V AC : 2.9 W (all LEDs lit and Roland PSU-1U)
  • +15V rail : 190 mA
  • -15V rail : 90mA
  • weight : 0.410 Kg (no battery)

You can order your kit here

 

Assemble and solder your unit following this method.

Theory of operation regarding the chorus.

 

 

 

 

 

 

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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