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