Basic 10-step sequencer based on CD4017 decade counter
Bill of materials
One of the most popular and popular means of creating control signals in block-modular sound synthesis systems are sequencers. They allow you to quickly solve the problem of creating repetitive rhythmic patterns based on pulsed clock signals. This project will serve as a lesson for those who are going to understand the essence of this type of modules and how they are arranged. The project is based on a five-step Johnson CD4017 divider counter, with ten decoded outputs, which will allow you to create the simplest 10-step sequencer.
The sequencer circuit was developed by Sergey Cherepnin and was released as a Serge system module under the “R16 Sequencer” index since 1973. Its various options can be found in collectors and fans in the form of originals and remakes. An unpleasant feature of this module is the lack of an internal clock source, however, you need to understand that, historically, this module went along with the Serge programmer under the “PRG” index.
This module used a single +6 V power bus, effectively setting the output voltage to about 5 V. The output of this module from the Serge product line was probably related to the failure of the +6 Volt power bus in later devices using only +12 and - 12 volts.