These are eurorack reproductions of rarer Moog (early and custom) modules.
As with my other "Moog" eurorack modules, these complement the Behringer "System 55".
The general design philosophy behind these is:
- "Moog Modular", but in eurorack format.
- Modify the Moog designs only to correct errors.
- Support the Moog Modular workflow
- Panel aesthetic matches the Behringer “System 55” modules.
- Use of through-hole components (where possible) and the standard eurorack power supply.
I can supply panels for all of the modules below. These are 2mm aluminium, anodised black with natural aluminium graphics (all production panels include the vertical side "stripe" to match the Behringer System 55 modules) and are manufactured in the UK.
I try and keep a stock of the more popular panels - see below for current stock levels. Some panels are "made-to-order", the lead time for producing these is normally 2-3 weeks.
See page "Moog Modules" for the more common modules.
901C "Output Stage"
The 901C provides waveform amplification to allow a 901B (or 901) Oscillator to be used as a modulation source. It also generates positive-going and negative-going pulse waveforms (for "trills" etc.). There are two complementary outputs.
8HP, single PCB design with easily obtainable through-hole parts.
The original Moog module is rare - only about 15 were made.
The Moog module used a 3-pole 6-way switch, which is expensive and not suited to the smaller Eurorack format. My design substitutes an electronic switch for the output switching, all other parts of the circuit are as the Moog original.
Can also be used with Behringer 921B or 921 Oscillators!
901C Build document
995A Reversible Attenuators
This module is a Eurorack implementation of the Moog 995A reversible attenuators, or “attenuverters” in modern terminology.
As far as I am aware, this module was produced as a “special” for the Keith Emerson Moog Modular, and therefore included in the recent reproductions.
The module uses my interpretation of the Moog op-amp based attenuverter circuit based on the CP3A PCB.
The following build options exist when building this module:
- Normalising of the lower two circuits to the input above.
- Normalising the top circuit to a reference voltage, with various reference voltage options.
995A PCB Price GBP 8.00 (10 in stock)
995A 8HP panel GBP 20.00 (5 in stock)
Triggered Controller
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| 964 Triggered Controller |
The module generates three controllable output voltages actuated by either push buttons or V-trigger inputs.
This design is derived from pictures of an original module on the modularsynthesis.com website. The Moog PCB for this specific module had been modified to provide negative output voltages; the assumption being that as originally designed it generated positive voltages.
In my implementation, the output range for each potentiometer can be configured using jumpers.
964 PCB Price GBP 8.00 (7 in stock)
964 8HP panel GBP 20.00 (1 in stock)
"Emerson" LFO
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| Emerson LFO |
However, Keith Emerson’s custom Moog system did include three simple triangle/square LFOs, which is the inspiration for this module.
As in the original, the panel represents a “converted” 902 VCA panel, complete with “dymo” style labelling.
- Outputs:
o Triangle: ± 3V
o Square: ± 4V
- Typical Frequency ranges:
o Low range: 0.06 to 2.5 Hz
o High range 0.2 to 17Hz
o Use of the CV inputs will extend these up to approx 35Hz
LFO 8HP panel GBP 20.00 (1 in stock - panel cut-out is for APEM toggle switch).
902-A Bandpass Filter Adaptor
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| 902-A Adaptor |
It is not known whether this is an accurate reproduction of the original Moog filter, as it is based on photos of a single module, and no original Moog schematics are currently available. As such, the module should be considered “experimental”.
902-A PCB GBP 8.00 each (10 in stock)
902A PCB + Daughter PCB for 902 GBP 12.00 (10 in stock)
902-A 8HP panel GBP 20.00 (made to order)
963 Sequencer Utility
963 Sequencer Utility
This module is based on the 963 modules that R.A .Moog built
for the State University of New York CEMS system. It is designed to be used
with the Behringer 960 Sequential Controller and the 962 Sequential Switch.
The 963 provides four functions:
-
Direct connection of 960 outputs A,B,C to 962
inputs 1,2,3 (optional).
-
Switchable “Auto On” – selecting 960 channel 1
will automatically start the 960 oscillator.
-
Switchable “Auto Shift” – direct connection of
960 channel 1 “out” to 962 “shift in”.
-
Switchable “Multicycle” – enables the 960/962
combination to run through a single cycle, then automatically stop.
Note that the first three functions can be achieved without
the 963 using just front panel patching, however the “Multicycle” function
cannot.
The 960 will need connections to be soldered to the PCB. The 962 ideally needs to be modified with the addition of a
2/3 step select switch, and optionally to free up switch connections on several
input jack sockets to allow the front panel connections to override the 963 if
required.
963 PCB GBP 6.00 each (9 in stock) 963 6HP panel GBP 15.00 (made to order)
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| 963 Sequencer Utility |
This module is based on the 963 modules that R.A .Moog built for the State University of New York CEMS system. It is designed to be used with the Behringer 960 Sequential Controller and the 962 Sequential Switch.
The 963 provides four functions:
- Direct connection of 960 outputs A,B,C to 962 inputs 1,2,3 (optional).
- Switchable “Auto On” – selecting 960 channel 1 will automatically start the 960 oscillator.
- Switchable “Auto Shift” – direct connection of 960 channel 1 “out” to 962 “shift in”.
- Switchable “Multicycle” – enables the 960/962 combination to run through a single cycle, then automatically stop.
Note that the first three functions can be achieved without the 963 using just front panel patching, however the “Multicycle” function cannot.
The 960 will need connections to be soldered to the PCB.The 962 ideally needs to be modified with the addition of a 2/3 step select switch, and optionally to free up switch connections on several input jack sockets to allow the front panel connections to override the 963 if required.
Frequency Divider
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| Frequency Divider |
The divider gives a 25% pulse wave output that can be switched from /2 to /16. It will work with a variety of input waveforms, and while primarily intended for audio use it works at sub-audio frequencies.
Frequency Divider Build Manual (PDF)
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