Tools, APP Software Used etc.

Eagle

Description

SEM attenuverter--FRAC format synthesizer module

Large Format synthesizer "attenuverter" based on a classic Oberheim design. Photo shows it in PAIA frac format, but any synth that provides +/-15V power will work.

Allows you to fine tune modulation control voltages: amplitude, phase (0 degrees, 180 degrees), and offset bias.

Github for latest build can be found here: https://github.com/cslammy/SEM_ATTENUVERTER

Github repo includes board layouts, eagle files, gerbers etc.

The project only includes the main PCB; no front panel.

For more information, please see the blog posts about this:

Improved buffers/current design as of 9-22-22

http://audiodiwhy.blogspot.com/2022/09/again-few-years-ago-i-designed-laid-out.html

Skiff build:

http://audiodiwhy.blogspot.com/2019/09/skiff-to-my-leiu-my-first-skiff.html

Initial design on perf:

http://audiodiwhy.blogspot.com/2019/08/attenuverter-part-i-prototyping-sem-way.html

Schematic and Layout

Schem, layout etc.

board schem drawings etc.pdf

Download Gerbers Download BOM(Bill of materials)

Sep 24,2022

615 views

SEM attenuverter--FRAC format synthesizer module

A modular synthesizer attenuverter PCB inspired by Tom Oberheim's legendary SEM design. Like the SEM, it uses an usual center tap pot.

615

Published: Sep 24,2022

Download Gerber file 8

BOM(Bill of materials)

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Only PCB

PCB+Assembly

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