993 Trigger & Env Voltages


AMSynths 993 Panel

Introduction In August 2020 I bought a set of Behringer System 55 modules, as my first journey into Moog modular. My plan is to recreate the Klaus Schulze IIIP synthesizer and Dual Sequencer setup that Klaus bought on 22nd December 1975, and used successfully for many years. Whilst the Behringer modules cover most of the Moog modules I need, there are a few additional modules and changes I have made.

AMSynths 993 Module This is a replica of the original Moog design but without the colour illuminated slide switches. Even Moog could not find these when they re-issued the System 55 and had to have them 3D printed. I have used black DPDT slide switches, which switch on the circuits as well as an indicator LED. I have used red LED’s for the Trigger Inputs, warm white LED’s for the trigger routing, and green LED’s for the 911 to 902 routing. They are cylindrical LED’s mounted on standoffs, which match the Behringer SMD LED’s.

A new AM993 PCB has been designed with a 12V power inlet socket, the switches and LED’s and Molex connectors to the 911’s, 911A and 902’s. Rather than hand wiring to each jack socket I have used a more robust cabling system that uses Molex “latching” 2 and 3 pin connectors. A small daughter PCB sits on the back of the 902, 911A and 911 modules. Molex connectors are used to provided the inter module cabling, with wires soldered to the various Behringer jack sockets from the daughter PCB’s. The jack sockets are not normalised, so no PCB traces need to be cut on the Behringer modules.

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