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