Sect. 111 Page 8
of the sync pulse amplifier, V17, through RC an 3-7 POWER SUPPLY
coupling which lowers the average voltage on the
grid B-. to In the absence of pulses, V17 is biased The Power Supply is a full wave rectifier and regula-
to cut-off by the bleeder to B+. When a positive tor which supplies + 375 volts. The + 75 volt and
pulse appears the at grid, it momentarily turns + 225 volt regulated outputs are taken from a voltagc
V17 "on", thus, inducing a large voltage swing in divider across the + 375 volt supply. The main
the pulse transformer primary. The resistor and requirement on the three regulated voltages is very
diode in the secondary remove the excursion, positive low impedance at low frequencies. Reasonable vari-
resulting in a negative pulse at the SYNC OUT ter- ations in the actual voltages do not affect the output
minals. frequency or waveform. |
ACEC
HEWLETT-PACKARD
