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).
