In accordance with another feature of the invention, {TAIL ~ a Schmitt trigger} can be used to generate pulses from {HEAD ~ the alternating current control voltage} 
In accordance with another feature of the invention , { TAIL ~ a Schmitt trigger } can be used to generate pulses from { HEAD ~ the alternating current control voltage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD