Stereo Plasma Speaker - PWM

This is the final, completed version of the plasma speaker system. To get the highest audio reproduction, PWM was used (PWM is linear). The setup is powered directly off of rectified, filtered mains (170 V DC) and draws about A. The music output is true stereo as there are two separate modulation and driver stages. PWM is achieved with the TL494, and a modified two switch forward/flyback topology was used for the driver. Frequency response is from about 100 Hz to 20 kHz; the design allows a conven