Plasma pen only two kind of working wave. It is plasma sine wave and plasma squre wave. The most popular plasma pen using on the market all plasma sine wave.
plasma pen characteristic
Plasma energy coming from high voltage output and frequency working. Input DC have to transfer by transformer and become available energy for shooting. In case energy waste, PCB design and building is very important issue. What is more, trouble design will cause machine burn.
Plasma sine wave is a intermittent band has waves and troughs as below video display. This wave will not cause machine over heating and turn off.