The card simply plugs directly into the 8 pins Jones “keyboard” socket and is powered by the Synthi, no cables no connector, it’s plug and play, easy and hassle free.
For use with a VCS3, the Jones plug can be mounted onto the top side of the PCB but an adapted umbilical cable with swapped connections is requested, the standard cable won’t work.
Warning : the card’s power consumption is 155mA on the Synthi’s +12V power rail, which is too much load for a MK1 PSU.
It should never be plugged into a MK1 unit, this would fry its PSU. I assume no liability in case of problem (anyway, it can be repaired, no worries).
In several MKI units (including my own one) I added an extra PSU to power a KS, it is ok for the SQ-1 Card and I’m happy to share the how to if needed.
Another solution is to power the SQ-1 via its USB port and omit the power circuitry on the card.
– The SQ-1’s CV outputs A and B are routed respectively to the Synthi’s input channel 1 and 2. Thanks to a multiturn trimmer, the CV can be scaled to get equal temperament when the Synthi’s input level pot is set to 10, therefore no more tricky adjustment is needed to control the Synthi 1V/oct. A good working and properly calibrated Synthi tracks in tune over 5 octaves with the SQ-1 Card.
– The SQ1’s ins and outs minijack sockets are still working, the SQ-1 can control and sync with other synths together with the Synthi.
– Other CV scaling such as the Buchla 1.2V/oct is possible.
The SQ-1 mounting to the SQ-1 Card is not difficult and can be performed by any person with basic soldering skills and tools.
Available as DIY PCB + alu panel set (€95 shipped) and pre-built (€350 + shipping).