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