Trigger-Timing Notes

From Erik T 22 Aug 16

x  ICSP 10k pullup and diode from +5V to VPP/MCLR_N not needed
  
x  Add diode from +5V to ICSP pin 2
  
x  Opto - Isolator outputs rise time too slow for drivers
    Schmidt Triggers on Opto outputs ?]
  
x  DG14 Rx Tx Channel C hook - up to Iridium

From Hans Thomas 22 Aug 16

xI  GPS 5V should come from Iridium Board or PC-104 ( Jumper is OK )

x  Serial Port C goes to the Iridium

x  U1A Opto Isolator not required  
    SMCe not isolated ??
  
x  Driver chip not needed for 1 PPS out to MVC
    Schmidt Trigger drive sufficient
	
x  Safety capacitors around U5 and U7 DC/DC Converters
	
  U9A +5V_DVL_T circled
x   Needs to be "+5V_K_PPS"
x   and ... +5V_MB_T needs to be "+5V_MB_PPS"  
  
  Trig Out Sheet
x   To Doppler Velocity Log ... Can use same 5V as Kft 1 PPS
x	To MultiBeam ... Can use same 5V as MB 1 PPS
	
x  Pulse Width ~ 1 mSec

x  Pull Downs on schmidt trig inputs ( optional load )

x  Add a 1pps spare channel

  Smaller connector for J10 ( ICSP )

  Perhaps SM connectors, top and bottom