untitled

VR1

Relay 1

Q1 Relay 4 Q5

Relay 2

Q2

Relay 3

Q3 Q4

Figure 13-19:
Place the
RB5-5-S
relays,
LM7805
voltage
regulator,
and 2N3904
transistors
on the
breadboard.

Chapter 13: Sensitive Sam Walks the Line 323