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Four current-tunable chaotic oscillators are presented in a set of two diode-reversible pairs. The first pair employs a floating-diode technique whereas the second pair employs a virtually-grounded-diode technique. Two chaotic attractors of a pair are 1808-rotated images of each other. Each oscillator consists of six basic electronic components which are minimal in a category of chaotic oscillators that exploit a capacitorinductor-capacitor network, opamp(s), diode(s) and resistor(s). Current-tunable bifurcations are demonstrated.Introduction: Studies of chaotic circuits have attracted great attention owing to a variety of applications in science and technology, e.g. chaos-based secure communications [1,2]. Existing 3D chaotic oscillators include a category that employs six types of basic electronic components, i.e. a capacitor-inductor-capacitor (CLC) network, opamp(s), diode(s) and resistor(s). Such a category is of particular interest as most components, except the nonlinear diode, are linear building blocks commonly found in classical sinusoidal oscillators. Although six minimum numbers of components are desirable if each type is reduced to one component, most chaotic oscillators in this category have employed more than six components [3][4][5], but never been demonstrated clearly using a current-tunable technique. In this Letter, four current-tunable chaotic oscillators are presented in a set of two diodereversible pairs. Each oscillator consists of six minimal components in the category and is capable of current-tunable bifurcations.

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