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