Live in Chiangmai ,Thailand. Graudated from King Mongkut Institue of Technology Ladkrabang Campus .I Study in Electrical Engineering since 1980. Spicialist in Audio circuit design . Use spice simulation circuit program from 1990 and on. Now I have a pre phono amplifier project. a DAC project. My focus is how to design a musical alike amplifier and pre amplifier phono amplifier etc.