The IF108 is a combination module combining a Chaos Generator ('Cha') with a manually driven Quadrature Oscillator ('QuO').

The main function of this module is as a versatile chaotic signal generator. Chaotic signals are signals that have varying degrees of interesting irregularity without actually becoming random. This chaotic signal generator is an analog electronic simulation of the classical driven double potential-well problem, with the addition of extra gain in the circuit loop, and an extra cross-coupling path to extend the range of the chaotic patterns available.

The double-well system is a "second-order" system and therefore requires an external driving signal. This is provided by the second part of the module, a sinusoidal Quadrature Oscillator (QO).

The two parts of the module may be used together or separately. The CG may be driven by any output of the built-in QO or by any external oscillator. The QO may drive the CG or be used independently as a four phase oscillator for the usual spatial modulation and other applications. Both parts of the module are manually controlled, to provide a compact, cost-effective unit. The QO has a frequency span of ~0.03Hz to ~3kHz in two overlapping ranges.