Description
The GS1-L is an LFO module, using the design of the LFO provided by Roland within the System 100M. The module provides a single selectable LFO with ranges from 0-10v and -5v to +5v depending on the waveform.
The GS1-L outputs Sine and Triangle waves that oscillate from -5v to +5v. In addition a square, ramp and sawtooth wave can be selected which all output between 0 and 10v. If these outputs are too hot, you can use the level toggle switch to reduce to roughly 1/10th the output voltage ranges.
By using the range toggle switch the LFO can be switched between L, M and H frequency ranges. The LFO does not go into audio range, but can go as low as approx 2s.
The partial DIY kits come with the BA6110 op amps, as well as RC4558 op amp, all transistors and the 2P5T rotary switch.
Inspired by the BA662 IC used in classic Roland analog synths, the Ge0sync (GS) series 1 is a DIY option to get small hp equivalents to some of the Roland System 100M into your Eurorack. Making use of the BA662 clone available from Open Music Labs (OML) or in some cases the almost equivalent BA6110 IC which is not yet un-obtainium. The GS series 1 provides everything you need to build a classic analogue synth voice including utility and modulation modules including VCO, VCF, VCA, ENV and LFO. The VCO make use of the CEM3340 VCO IC as many of the original parts used in the 100M VCO are long since discontinued. The series also adds a simple mixer than can average or sum the inputs (so works for both CV and audio). All partial kits include a bonus passive multiple panel/pcb set.
GS1-L Features:
- Waveform selection and Frequency controls
- Toggle switch between L,M,H freq ranges
- Toggle switch between L,H output levels
- CV Inputs: Frequency
- CV Output: LFO Out
- Bonus passive multiple panel/pcb set included
- Width: 8HP
This Panel & PCB set includes the following rare parts (Green in BOM):
- 2 x 2SK30A-GR
- 2 x 2SA1015-GR
- 2 x 2SC1815-GR
- 2 x BA6110
- 1 x RC4558
- 1 x 2P5T Rotary Switch
GS1-L – BOM & Build Guide
