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