TM 9-4931-294-15/2
maintains a constant 6.8 volts which is filtered by C107
is described. The ac input is applied to fullwave rectifier
and applied to BIAS VOLTS ADJUST control R115,
diodes CR301 and CR302. The rectified output voltage
when adjusts the output voltage from 0 to6 volts.
is filtered by capacitor C301 and fed to the collector of
pass transistor Q301. Voltage divider network R306,
(3) 22.5Volt Local Supplies. Two secondary
R307, and R308 feeds a sample of the power supply
windings of T701 provide the input ac for the 22.5volt
output voltage to the base of difference amplifier Q303.
Since the emitter of Q303 is held at a fixed level by
supplies (figure 28). One secondary feeds the positive
Zener diode VR306, the collector output reflects the load
supply; the other feeds the negative supply. Since both
supplies are almost identical, only the 22.5volt supply
Figure 2-8. "22.5Volt Power Supply, Block Diagram
2-10
