Circumference Circuits; Clock Pulse Generator; Remote Control Circuit; Shaping Circuit And Filter - Radio Shack TRS-80 26-3650 Service Manual

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-