Sequential Switch: Front view

This Module is build around the counter 4017. It provides you with with 8 bidirectional toggle switches. The active switch is signaled with a LED. All switches are brought out to the front panel, so you can patch this module with maximum flexibility. Audio signals are switched as well as control voltages. This module is clocked external and can be clocked with high frequencies. Way above the audio range if needed. You can select the stepped sequence length between 2..8 steps with a rotary switch. The reset input is brought out as well.
Specs and features
• Sequential switch with 2..8 steps
• Bidirectional toggle switches
• Audio and control voltages switchable
• External clock way above audio range
• Runs on +/-15V and +/-12V

The documentation for download can be found in my website.

Sequential Switch: Schematic

The 4017 is clocked through the clock input with IC5C and IC5D. RS1 selects the sequence length. The DG419 toggle switches are successive toggled with the every active step of the 4017. The LED signals the active step.

Sequential Switch: Populated PCB

Sequential Switch: Back view