Voltage-mode universal filter with one input and five outputs using DDCCTAs and all-grounded passive components. - Orapin Channumsin; Tattaya Pukkalanun; Worapong Tangsrirat (Microelectron. J., 2012)

Single-input four-output voltage-mode universal filter using single DDCCTA. - Orapin Channumsin; Worapong Tangsrirat (Microelectron. J., 2013)

Resistorless realization of electronically tunable voltage-mode SIFO-type universal filter. - Worapong Tangsrirat; Orapin Channumsin; Tattaya Pukkalanun (Microelectron. J., 2013)

Compact electronically tunable quadrature oscillator using single voltage differencing gain amplifier (VDGA) and all grounded passive elements. - Orapin Channumsin; Worapong Tangsrirat (Turkish J. Electr. Eng. Comput. Sci., 2017)

Electronically tunable floating lossy series-type inductance simulator using VDBAs. - Orapin Channumsin; Tattaya Pukkalanun; Worapong Tangsrirat (IEEA, 2019)

Automatic Monitoring and Controlling System for Hydroponics Greenhouse Environments Through Smartphone Application. - Orapin Channumsin; Jirasin Trancharoen; Sarut Sonchaiyaphum; Jirapun Pimpol; Worapong Tangsrirat (ISPACS, 2022)