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GS1-O
The GS1-O is based on the classic Curtis CEM3340 VCO IC. The circuit can use either a CEM3340 (the Rev G re-release is readily available, and of course if you have some older NOS you can use those also) or the Alfapar AS3340 clone IC. The IC provides Triangle, Square and Sawtooth right from the…
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TB-Valhalla
TB-Valhalla – 303 Inspired Desktop December 2023 – New firmware available… August 2023 – DIY kits are available to order from synthesizer.nz and as pre-built systems built to order. The TB-Valhalla combines the modules available in the TB- range of eurorack modules into a single stand-alone desktop synthesiser. Not just another 303 clone, the TB-Valhalla…
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GS1-NR
The GS1-NR is a simple utility module that provides two functions. The first is a ring/cross modulator function using the same LM1496 balanced modulator/demodulator IC as found in the Roland System 100M circuits. The second provides a transistor noise generator which can output both white and pink noise. The module ring modulation circuit allows for…
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GS1-E
The GS1-E is a simple CV envelope generator. Based on the design used in the Roland System 100M, this envelope would be classed as “fast” or fairly “snappy”. The module provides pots for the usual Attack, Decay, Sustain, Release phases of the envelope which can be triggered either using the manual gate momentary push button,…
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GS1-L
The GS1-L is a simple utility LFO module, using the design of the LFO provided by Roland within the System 100M. The generation of the waveforms and output stage make use of the BA662 differential op amp circuit, and as discussed on the GS1-A and GS1-F pages, the BA6110 is a suitable replacement. Due to…
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GS1-F
The GS1-F low pass/high pass filter module is based on Roland’s 4 pole filter design using the BA662 differential op-amp circuit. The classic buttery, self resonating filter sound as present on many of Rolands classic analogue synths of the 70’s and 80’s. As discussed on the GS1-A page, the BA662 has become almost un-obtanium in…
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GS1-A
The GS1-A and its smaller brother the GS1-A2 are based off the design of Roland’s System 100M series of modular synth modules. The heart of these modules is the BA662 differential op-amp that Roland used in just about everything in the late 70’s and into the 80’s. The BA662 is no longer available, but Open…
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TB-Super-O
12hp Manual Tune1,2,3 & PW1,2,3 Gain for Sqr1,2,3 & Saw1,2,3 when combined into the Super-X outputs CV Inputs: V/Oct 1,2,3 Audio Outputs: Super Saw, Super Sqr, Saw1,2,3 & Sqr1,2,3 individually. The TB-Super-O came about by accident. While testing a pair of TB-O modules we stumbled across a beautiful phasing effect with the typical slight detune…
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TB-EFA
The TB-EFA shares the same ‘3 and a bit’ pole filter circuit as the Roland TB-303. It also provides a complete version of the envelope used by the 303 with decay control. Rounding off the module is the BA662 based VCA circuit which is also controlled by the same envelope as the filter. Like the…
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TB-EF
The TB Filter Envelope module is inspired by the filter, envelope and accent circuits of the Roland TB 303. It copies the same 3 and a bit pole low pass filter and most importantly the resonance feedback loop. Like the original it has pots to control the Cutoff Frequency, Resonance and Envelope Modulation. These are…
Ge0sync Synth 