Meter Illumination Circuit.

TM 11-6665-209-40

f. Meter Illumination Circuit.

The meter illumination circuit consists of pushbutton

switch S101, glow discharge lamp DS101 and resistor R111. Illumination voltage for the

lamp is taken from tap 11 on the secondary winding of transformer T101, rectified by

CR101 and filtered by C102 The other side of the circuit is grounded. Rectifying the AC

voltage eliminates any possibility of hum coupling from the illumination circuit wiring in-

to other wiring in the cable harness. When switch S101 is depressed, lamp DS101 ig-

nites. Resistor R111 limits the lamp current to its operating value.

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