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