Radio Shack TRS-80 26-3650 Service Manual page 20

Filter
waveforms
approx.
I
~*l
1.2
kHz
r*
|<
sj
approx. 2.4
kHz
-3V
@
-3V
©
-3V
Data output
C2
from the LSI
is
integrated
(waveform
(§) )
and shaped
into
an
AC
waveform (waveform
©
)
by
capacitor
d
and
resistor r1.
©
®
<B>
Input
signal
from
tape recorder
®
is
integrated
by capacitor c2
and
resistors
r2
and
r3
(waveform
(|)).
The waveform
(§)
is
cramped between
—
3V
and
OV
by
diodes d1
and
d2.
-
19-