In {TAIL ~ such a construction}, {HEAD ~ the control signal} is applied to the digital to analog converter 
In { TAIL ~ such a construction } , { HEAD ~ the control signal } is applied to the digital to analog converter
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH