12
EFT/ Burst Generator PEFT Junior
3.3 Power supplies
the PEFT Junior must be supplied from a single phase supply of either 230 V / 50 Hz or 115 V /
60 Hz. Supply voltage changeover is accomplished by use of the manual switch on the rear
panel.
115/230
L
N
PE
Filter
Main switch
Mains voltage
control
HV supply
(Main PCB)
Supply
+24 V
Power
Main PCB
Manual
switch
Fig. 3.3
3.4 High voltage circuit
The high voltage circuit is mounted on the main PCB and comprises, the high voltage source, an
earth safety relay, high voltage switch and the energy storage capacitors.
These capacitors, 11 in series, are a charge reservoir loaded from and regulated by the high
voltage source. They provide energy for the impulse, which is released by the high voltage
switch.
Generator
control
Earth relay
Fig. 3.4