TM 5-6675-316-14
(10) To supply the high voltage required to fire the xenon flash tube, an
oscillator (A) produces a triangular wave shape which the Schmitt Trigger (B)
divides into alternating pulses displaced in time from one another.
(11) These pulses are applied alternately through the power drivers to the
30:1 transformer at 50 V (C), producing a high voltage alternating wave. This high
voltage is fed to the rectifiers and filter capacitors of the voltage doubler
circuit (D). The voltage doubler circuit provides charging voltage (75 V) for the
trigger pack capacitor and control feedback to the regulator (E). The regulator
determines the triggering point (in B) and, therefore, the width of the pulses going
to the power drivers.
(12) When the high voltage capacitors are fully charged (approximately 1500
V), the regulator moves the triggering point beyond the peak of the oscillator
output, stopping the pulse output and the production of high voltage. Production is
resumed when the voltage across the capacitors falls below the level set by the
regulator.
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