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AM2520 Module - Eµ Voltage Source Output Unit (VSOU)
Overview This module is a clone of the Voltage Source Output Unit module in the Eµ Systems Modular Sequencer. It is a very close replica with only minor changes to use
modern components and to add some new features. The VSOU takes a 3-bit binary code and translates it into 8 steps of 4 independent control voltages. It's modular, so the more complex functions are in other modules. This module simply
creates CV's.
Original Circuit The original design dates back to 1974, and the schematics have unfortunately never been located. The original was probably a very simple circuit with no sub-module.
AM Circuit
I have cloned the circuit based on a Thomas Hendry idea of a CMOS 4028 chip buffered with Op Amps. I have cloned the original schematic and added one additional feature.
Front Panel
The front panel is a standard AM design, 90mm wide and 4U high, with black lettering. Controls knobs are standard Eµ Modular designs.
Build History
The schematic was transferred into Eagle CAD in the summer of 2005 when I was on holiday in the Peak District (UK). The circuit has been laid out over 2 sets of PCB's, the main 4028 is on a digital board attached to the front panel. There are then 4 pot PCB's which sum the pots for each channel.. A prototype will be tested in the Spring of 2006.
A programmable version of the VSOU is being designed as the AM2525 (PVSU). This will have a matrix of 8x1 control pots which will have their values stored in a 8-bit NVRAM memory. The PVSU will have 64 memory locations and be
controlled via the 2515 64PAG. It will also have individual outputs, so that it can be used to programme other AM modules, as well as sequence.
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