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The LEVIN is an LED Voltage Indicator with a seemingly simple function: show an input voltage on a large LED bargraph. It provides a 21-LED bargraph display showing positive and negative voltages, with full-scale ranges of 500mV, 1V, 5V and 10V, and suitable for showing control voltages and audio signals from DC to in excess of 10kHz. Support for the CESYG Bus5, the Eurorack Power Bus CV line, and a front panel input, together with a separate monitor output, ensures LEVIN can monitor many signals in a synthesizer with ease.



The Bus5 introduces a new concept into the Eurorack modular synthesizer: the expandable routing bus. It provides 5 passive signal busses that can handle both audio and CV signals. Using standard 10-way IDC ribbon cable multiple Bus5s can be placed anywhere in the Eurorack system.

At only 4 HP wide, and with a rack depth of only 29mm (excluding bus headers) ensures the Bus5 can be used in the shallowest of systems. And being entirely passive there is no need to quote power consumption figures!

BUS5X Expander


With the BUS5X expansion adaptor one can expand the reach of the BUS5 system using common SVGA computer monitor cables. The BUS5X can be easily mounted on standard SVGA wallplates or on custom panels.



The DuaLFO is a dual voltage-controlled Low-Frequency Oscillator, offering two versatile slow modulation sources:

  • The main LFO provides three sine waves 120 degrees apart (0, 120, 240 degrees). Frequency range is 45Hz down to around 90 minutes per cycle (about 180 micro-Hz). CV control is normalised to the auxiliary LFO sine or the CV bus (link-selectable).
  • The auxiliary LFO is a triangle-core oscillator with a similar frequency range to the main LFO, and includes a diode sine shaper. In addition to CV control, its shape is fully adjustable from saw to ramp, and is also CV controlled. Finally, the auxiliary LFO is syncable, with push button selection of rising or falling edge sensitivity.

Both LFOs have bipolar LED indicators, especially useful at slower speeds. Knobs are high-quality spun-aluminium with knurled sides for comfortable but positive grip. All jacks are the same high-quality Cliff ones we sell. Finally, the 18HP-wide 2mm aluminium front panel is produced in MetalPhoto giving crisp graphics and a hardwearing finish.

Power consumption is typically 40mA per rail, and can run on both 12V and 15V systems. Reverse-voltage and missing-rail protection is included as standard.

The blog posting about the DuaLFO has a couple more pictures of the completed unit.

DIY Downloads:

A professionally printed and bound version of the user manual can be downloaded from Lulu.com.

PCBs and front panels can be purchased from Paul at Krisp1. Please contact him for latest pricing and availability. Also please note that Paul is unable to provide any support for this project - if you have any questions please use the Contact form.