AudioDIWHY
UNITED STATES OF AMERICA • + Follow
Tools, APP Software Used etc.
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KiCad 8.0KiCad
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Description
LFO2 From "Electronics For Musicians"
Analog LFO with variable frequency and lots of modulation options based on an EFM ("Electronics for Music") schematic found here:
http://www.modular.fonik.de/files/EFMforum/orgEFMfiles/lfo2.pdf
The module requires 3 PCB's: main board, jacks board and front panel.
The jacks board can be found in the community project here:
https://www.pcbway.com/project/shareproject/3_5mm_4_jack_PCB_a13faf65.html
For the front panel I recommend using black mask with white silk; choose the $1.50 option to not print project name to the board.
The modular synthesizer format used for this module is PAIA FRAC.This is a different size module and power bus vs. Eurorack.
If there is enough interest in this project I will port this EFM design to Euro; I can also see using a small MCU for the random voltage generation, and a monolithic VCA IC instead of the OTA's, like the 3364: https://audiodiwhy.blogspot.com/2025/03/as3364-experimenters-board-low-parts.html.
More info about this LFO in this blog post:https://audiodiwhy.blogspot.com/2024/12/efm-lfo2-old-skool-fun-build.html
Code
Falstad simulations of OTA current sources
https://github.com/cslammy/efm-lfo2
Schematic and Layout
kicad files for main board
LFO2 10-27-24A main board KICAD.zip
Kicad files for Front Panel
LFO2 FP 11-3-24 FRAK KICAD FRAK FRONT PANEL.zip
wiring diagrams
LFO2 wiring.pdf
BOM
lfo2-bom.csv
Custom Library as of 12-31-24
charhead-lib.pretty 12-31-24.zip
Dec 31,2024
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LFO2 From "Electronics For Musicians"
Cool Roland-101 esque analog LFO Module--Frak format
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Published: Dec 31,2024
Download Gerber file 4
BOM(Bill of materials)
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File Last Updated: 2025/01/02 (GMT+8)
File update record
2025-01-0209:13:54
Parts List (BOM) is updated.
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