Q1 = MPSA42 or equivalent

R1 = 1.5MΩ, 1/4W (Reference Figure 2)

R2 = 180kΩ, 1/4W

R3 = 12kΩ

R4 = 4.7MΩ

R5 = 91kΩ

C7 = 0.001uF, 25V (Reference Figure 2)

C8 = 50µF, 25V (Reference Figure 2)

Z1 = 15V, 5%, 1/2W (Reference Figure 2)

Z2 = 5.6V, 10%, 1/4W

The AC current drawn from Earth Ground is regulated to remain virtually constant

as the AC Mains Voltage varies from 120VRMS to 277VRMS

FIGURE 7. Earth Ground Current Regulator

6506R-042308-11

D1

Q1

R2

R3

R4

Z2

Z1

C8

R1

SW3

LS6506R

AC

5

8

C7

AC

MAINS

P

N

Earth Gnd

R5