Experimental Setup
Coil-less Shinriki-type Oscillator
During a student's project a coil-less chaotic oscillator operating at a single 5V supply has been designed and realized. The non-linearity consist of two anti-parallel diodes, thus the I-V behaviour is well described by a hyperbolic sine function. The rest of the circuit is linear, which allows for a simple mathematical description and makes numerical simulations is easy. Parameters of the oscillator are the resistors R1 and R2, which are implemented as digitally programable integrated circuits. Thus, fully automated measurements of attractors using an USB DAC device are possible. Furthermore, chaos-control experiments in real-time can be performed, using a programmable (fix-point) DSP device in conjunction with ADCs and DACs.
Block Diagram
Block Diagram for Controlled Shinriki Oscillator
Principle block diagramm of controlled Shinriki oscillator. Note that the inductivity is replaced by an OP-amp circuit in our modification.
Schematic of modified Shinriki Oscillator including I/O buffering
Block Diagram
Block Diagram for Real Time Chaos Control
Hardware Realization
Complete System including DSP
ADC DAC Unit (c C. Reil)
Modified Shinriki Oscillator and I/O drivers (c T. Lamecker)