Figure 5-5. Timing and synchrony diagram (sheet 1 of 3).

TM 11-6625-444-14-1

particular balanced position required by the input

voltage.

p. The master +7 volts reference for the

voltmeter is derived using reference amplifier U9

as a reference element. The reference voltage is

produced using operational amplifier U10 and

emitter follower Q25, which presents a low source

impedance at the reference point. Transistor Q24

disables the +7 volts reference if the ratio mode is

used and an external reference voltage is applied.

Transistor Q23, coupled with the Zener in the

reference amplifier, produces a reference voltage

for the +18 volts regulator in the power supply

(A1).

. .Timing and synchrony diagram (sheet 1 of 3).