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Oscillator-Driver
Oscillator-Driver - cont - TM-55-1930-209-14P-12_159

TM-55-1930-209-14P-12 Water Purification Barges (NSN 1930-01-234-2165) Lighting System Manual
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TM 55-1930-209-14&P-12 1.1.3 Continued The  oscillator  (inverter)  is  shown  schematically  on  drawing  M-2194-C.    The  nominal  12  V  DC  input  is connected to + (1) and -(4), and the driver leads to "D" (6) and "D" (7).  Note driver leads receive AC, no polarity (unless signals are stacked and phasing must be retained). The inverter circuit terminal 2 is connected to terminal 1 on the timer board and is the positive supply for the timer board.  Terminal 3 is connected to terminal 2 on timer board and is the negative supply for this board.    Terminal  5  is  connected  to  terminal  4  on  the  timer  board  and  is  the  coding  terminal  for  the oscillator.  (see drawing S-4368-C) The  regulator  is  turned  on  when  it  sees  a  negative  on  terminal  5.    The  oscillator  may  be  keyed  on continuously for testing by connecting a 1000 ohm resistor from terminal 5 to negative A schematic of the FA 390A Oscillator is shown in Drawing M-2194-C. Assume  that  when  the  regulator  is  turned  on  Q7  conducts  first.    The  following  sequence  of  events  will occur, Current will flow through the upper half of the winding of T2.  By transformer action, Q8 will be cut off  (open  switch)  due  to  lowered  net  voltage  on  the  collector,  and  reverse  bias  being  developed  on  the base.  Shortly after current has started to flow Q7 will be driven into saturation (closed switch) placing most of the battery voltage across the upper winding of T2.  The current through this winding will now be Form No.  6310 0238







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