Lamp Control Circuit

TM 32-5865-218-24&P

Countermeasures Control Monitor Circuits

Simplified Schematic Diagram

Lamp Control Circuit. As shown in figure 3-4, resistors

(4)

R20 thru R27, zener diodes VR2 and VR3, amplifier U2, and transistor

Q7 comprise a current-limiting circuit. The lamp control potentio-

meter in the external system equipment is connected to pins J8-S,

The LAMP DIMMER CONTROL input at pin J8-T varies the

J8-T, and J8-U.

transistor Q7 output to power transistor Q1 on the countermeasures

control chassis. The output of transistor Q1 is applied to terminal

stud E2 for distribution to external system equipment at connector

pins J2-g, J7-W, J7-X, and J8-J.

Refer to figure FO-2, sheet 1.

b. RF Coaxial Switch S1.

Switch S1 controls RF input/output signals between external system

During normal operation, the FM

equipments at connectors J4 and J5.

antenna control input from external system equipment is high (logic

1). When the control input goes low, the switch operates to connect

the BITE input from external system equipment at connector J1 to the