There are disclosed a stencil printing ink having an ink thread-forming length when a 15 mm diameter chrome steel ball is pulled out of the ink at 150 mms of 30 mm or longer at 23\xb0 C. An active layer is situated between the first and second electrodes. The microphone system includes a power supply that provides a supply voltage to the microphone electronics, a polarization voltage to the microphone capsule and a supply voltage to the audio amplifier.