{TAIL ~ A strobe firing circuit} 20 and a switch 22 are coupled to the input 27 of {HEAD ~ a low pass filter} 23 
{ TAIL ~ A strobe firing circuit } 20 and a switch 22 are coupled to the input 27 of { HEAD ~ a low pass filter } 23
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH