EFM Electronics For Music ARCHIVES
EFM Synthesizers was located in Houston, Texas USA. EFM had been on the web since 1996 selling boards and kits to the DIY synthesizer community. The site includes schematics for ARP, Moog, Oberheim, Korg, and EMS-type voltage controlled filters, oscillators, amplifiers, and everything else you might need to build a modular synth. This an archive keeping Tom Gamble's EFM work evolving. EFM Users is for people that use electronics for making music. Synthesizers, computers, software, midi keyboards, midi modules, DIY electronics, guitar amps, stompboxes, transistor radios.ect are all legitimate topics. EFM projects are for experienced DIY builders, because project often require mods to the PCBs, and documentation assumes a high level of electronics experience.
KBD 2A
keyboard converter
LFO 5A
vc lfo/s&h/noise
RMP 1B
ring mod/lfo/preamp
RXCV
midi to cv converter
RXCVpro
midi to cv converter
VCA 5B
hybrid vca/mixer
VCA 6B
OB 2pole HP/BP/LP
dual vca/crossfader
VCF 1E
VCF 2E
with modifications
VCF 2F
moog ladder/vca
VCF 2F schematic mod
VCF 6C
ems diode ladder
VCF 7
arp 4075
R-ADSR/LFO
MS20 VCF
VC RADSR
VCF 2F buffer
VCF 8E
VCF 8E schematic mod
(harry bissell)
VCF 12A
Scott Bernardi mods
4P sallen-key VCF
VCO 4D
VCO 3D
VCO (Prodigy)
dual VCO (Rogue)
VCO 4E
VCO (Rogue)
VCO 4E mods
(jay schwichtenberg)
WAV 1B
Waveshaper/Sub osc
WILDCAT
Modular Midi Synth
I just ordered the last available Wildcat PCBoard! One called it a Gnom on stereoids, we will see... The plan is to lay it out as an semimodular synth (prepatched/normalled) with keyboard.
So here is the 28 pages thread about the widcat from the old forum. The most findings/mods/fixes come from
TOMCAT
DBop II Programmable Drummachine
Copy of the original EFM DBop site from 1998. DBop: a simple 2 pattern 8 -step drummachine with kick, snare & hihat, cell powered.
it could be built as a 16-step version too.
Moog HP VCF
orig. pdf
forum txt
orig. pdf
forum txt
EG LFO 1A
Mono Midi Synth
Block Diagramm 16-step mod
ADSR/LFO
Single Board Modular
Pitch2Voltage Converter
e-m-forum:
Bob Moog Etherwave (Harry Bissell PCB)
org pdf
EGs
old efm forum:
VCF1
org pdf
old efm forum:
org pdf
DEG 2A
3500 Series
4600 Series
dual ADSR
BASSACE
Midi Bass Synth
org pdf
old efm forum:
Mad Mouse Pro
Mono Midi Synth
org pdf
Sequencer2
16step Sequencer
MidiGate
Vref mod
org pdf
org pdf
pre 1900 Series
S6 VCO
770 VCF
CEM3374/72
synthvoice
3046 VCO
Analog Drum
3046 EG
ADC flash
LFO1A
LFO2
Seq1 sequencer
1900 Series
additional info
additional info
VCF 1F
Dave Kendall mods
Midi2gate converter
Oberheim
Frontpanel Artworks Database
VCF6 (+9V)
Mini1cv
VCO1C
VCO1D
VCO2B
VCO2D
VCO4B
VCO7C
3501
PSU
3506
Lag
3521
VCF1
3503 MidiPort
3508
ADSR
3534
Noise/S/H
3504
RXPro
3510
VC ADSR
3541
VCO
3512
Gated LFO
3542
VCO
marjan's mad mouse mods
intense modifications
(scott bernardi)
3531
VCA
3522
VCF2
3528
VCF2
3505 MidiGate
3529
VCF9
last update 1 FEB 2018