Radio Shack TRS-80 26-3650

4.
CIRCUMFERENCE
CIRCUITS
4-1.
Clock
Pulse
Generator
32,768
Hz
signal is generated
by the crystal
oscillator and is shaped
by
the inverters.
D
^
®
. ©
'•
—
*y-
^Dr-
7>7
4-2.
Remote
Control
Circuit
wv
—
wv*
—
1
Q1
4T
6
-3V
RY
ON
OFF
Q2
REMOTE
When
signal C1
is
HIGH, transistors
Q1 and
Q2
turn on
causing relay
RY
to
be
switched
on so
that the
REMOTE
terminal
becomes
active.
4-3.
Shaping
Circuit
and
Filter
© ®
)MIC
)EAR
-
18-