The Abacus is a recreation of the Sequencer Drum (no relation to the 8 step program), converted to use an LM13700 in place of the original?s 2 x rare CA3094, and with an on-board charge pump to provide the required 15V supply. An 8-step sequencer capable of creating exciting rhythms, bleeps, bloops, controlling external devices and much more.
This kit contains the PCB and all necessary parts. The enclosure can be selected, please select 10 knobs for a diameter up to 15mm, for 6,3mm shaft separately.
Here is the bill of material: bill of material
This project is by Lectric-fx, in cooperation with Musikding. If you have any problems with the contents of the kit, please contact Das Musikding (Klaus). Since this project is rather complex, it is more for the experienced builder. For technical problems here is the link to the support-forum: Lectric-fx Support.
Here is the direct link to the manual with layout and schematic: