  A pulsed oscillating power amplifier has been developed for high frequency
biasing\cite{kn:deb1} and real time turbulent feedback experiment in STOR-M
tokamak. It is capable to provide output peak to peak oscillating voltage of
around $\pm60$V and current around 30A within frequency band 1kHz-50kHz without
any distortion of any waveform signal. Overall output power is amplified by two
stages power mosfet op-amp as well as nine identical push-pull amplifiers which
are parallel connected in final stages. The power amplifier input signal,
collected from plasma floating potential during plasma shot, is optically
isolated with tokamak vessel for real time feedback experiment. Here, filtered
floating potential fluctuations having band width between 5kHz-40kHz has been
amplified and fed to an electrode inserted into the plasma edge to study
response of plasma turbulence. It is observed that magnetic fluctuations are
suppressed due to real time feedback of floating potential.
