Tom Oberheim is proud to reissue the classic SEM monophonic analog synthesizer expander module. The return of huge, juicy analog synth tone at an affordable price!
Originally released in 1974, the SEM is one of the classic discrete analog synths, with a huge, three-dimensional "fat" tone that must be heard to be believed. Tom's reissue cuts no corners- the circuitry is almost identical to original units. The only component changes were made due to unavailable parts, but the great tone has not been affected. No digital voice circuits, or thin-sounding analog "voice chips" here- only genuine hi-fi fat analog goodness.
This version includes a panel with 33 direct-access patch points on 1/8" jacks, transforming the SEM into a powerful "mini-modular" synthesizer. Not only does this allow tremendous voicing flexibility when used standalone, it allows easy interfacing with modular synthesizers or additonal SEM modules for limitless potential.
Specifications:
Single-Voice Monophonic Analog Synthesizer
Two oscillators, each with sawtooth and variable-pulse wave, pulse width and frequency modulation amount, ext envelope and LFO modulation select switches
Oscillator sync
12db/oct multimode filter with continuously variable lowpass, bandpass, and highpass modes, ext envelope and LFO modulation select switches.
Filter input mixer with continuously variable saw to pulse wave mix for each oscillator and external input amount for processing external sources.
Two attack/decay/sustain envelope generators
Sine wave low frequency oscillator with speed control
Patch Panel Connections
connection pin |
function |
direction |
A1 |
VCO 1 - External Modulation |
input |
A2 |
VCO 1 - Sawtooth Waveform |
output |
A3 |
VCO 1 - Sawtooth Waveform |
output |
B1 |
VCO 1 - Control Voltage #1 |
input |
B2 |
Ground |
- |
B3 |
VCO 1 - Control Voltage #2 |
input |
C1 |
VCO 1 - Sync Output |
output |
C2 |
Ground |
- |
C3 |
VCO 1 - Sync Input |
input |
D1 |
VCO 2 - Control Voltage #1 |
input |
D2 |
Ground |
- |
D3 |
VCO 2 - Control Voltage #2 |
input |
E1 |
VCO 2 - External Modulation |
input |
E2 |
VCO 2 - Sawtooth Waveform |
output |
E3 |
VCO 2 - Pulse Waveform |
output |
F1 |
VCO 2 - Sync Output |
output |
F2 |
VCA - Control Input |
input |
F3 |
VCO 2 - Sync Input |
input |
G1 |
LFO Trigger |
input |
G2 |
Ground |
- |
G3 |
LFO Waveform |
output |
H1 |
VCF - Control Voltage #1 |
input |
H2 |
VCF - Control Voltage #2 |
input |
H3 |
VCF - External Modulation |
input |
I1 |
VCA Output |
output |
I2 |
Ground |
- |
I3 |
Unused |
- |
J1 |
VCF - Highpass Signal |
output |
J2 |
Ground |
- |
J3 |
VCF - Bandpass Signal |
output |
K1 |
Selected VCF Response |
output |
K2 |
Ground |
- |
K3 |
Ground |
- |
L1 |
External Audio Input #1 |
input |
L2 |
Ground |
- |
L3 |
(duplicate of L1 - not used) |
- |
M1 |
External Audio Input #2 |
input |
M2 |
Ground |
- |
M3 |
(duplicate of M1 - not used) |
- |
X1 |
ENV 1 - Output |
output |
X2 |
ENV 1 - Gate |
input |
X3 |
ENV 1 - Trigger |
input |
Y1 |
ENV 2 - Output |
output |
Y2 |
ENV 2 - Gate |
input |
Y3 |
ENV 2 - Trigger |
input |
Complete electrical specs provided in the User's Manual.
Dimensions: 11.50" x 8.375" x 5.25"
Weight: 6 lbs
Power: External 24v wall transformer
