Data Output Circuit

TM 11-6130-385-34

modulator circuit and square wave 6.4 kHz input

from the oscillator board. The signal is augmented

by a + 5v-source from the +5v-regulator circuit and

transmitted to the base drive circuit on the power

switch board.

3-35. Base Drive Circuit

(fig. FO-9)

The base drive circuit is shown as a typical half

circuit for clarity. Darlington pairs (one mounted on

the PCB and the other on the A7 chassis) deliver a 7-

to 8.5v-push-pull signal to the driving transformer

3.4-voltage regulator.

Figure 3-24.

(T701) which produces a 4V peak-to-peak secondary

3-34. Data Output Circuit

signal (12.8 kHz) for the power switch base input

(fig. 3-25)

rectifiers.

The data output drive receives phase data from the

Figure 3-25. Data output driveC phase.

Section

VIII.

POWER

SWITCH

PRINTED

CIRCUIT

BOARD

3-37. Power Switch Circuit

3-36. Base and Current Sense Circuits

(fig. 3-27)

(fig. 3-26)

The power switch circuit also includes the recovery

The base and current sense circuits are located on the

c i r c u i t and pulser inductor L701. The phase data

c h a s s i s part of the A7 module. The driving trans-

f r o m the summing diodes is applied to the power

f o r m e r (T701) output is received by the summing

switches (Q708, Q709) and then to the pulser-

diodes (CR708, CR715) in the base circuit and

i n d u c t o r (L701). The recovery circuit receives 400-

d e l i v e r e d to the power switch circuit. The current

Hz phase input from its driving transformer (T901)

sense circuit applies the inductor L701 signal

on the A9 module. Output is directed to power

through terminal E 1 to the overcurrent circuit on

t r a n s f o r m e r T1 from pulser-inductor L701-7.

PCB A2.

3-46