Operating instructions

09
20
KHZ LOWPASS FILTER
2N3SbS
1-------1
I I
I
I
A
I L9 THROUGH Ll2
B
I
AUDIO OUTPUT
I
10 FM DEVIATION
I
I
METER OR
R'I-b
I
C29 I
OSCILLOSCOPE
2.21 K
I
ITHROUGH I
C32 I
AND SPEAKER
I
AMPLIFIER
-
I
-
I
L _______ -1
INPUT TO
DETAIL A
NO MODULATION
AT 100 KHZ
DETAIL B
POSITIVE MODULATION
>100 KHZ
DETAIL C
NEGATIVE MODULATION
<100 KHZ
NOTE:
FILTER ••••• POINT A OUTPUT OF FILTER •••••. POINT B
S \..lSEC
-j f-
3.2 VDC----------
OV----------
-l l-
S \..lSEC
S \..lSEC
>3. 2 VDC----------
-j I-
OV----------
-l f-
< S \..lSEC
S \..lSEC
-l f-
<3. 2 VDC----------
OV----------
-j 1-
> S \..lSEC
1. PULSE AMPLITUDE IS CONSTANT
FOR ALL CONDITIONS.
[
r
[
[
[
[
[
[
[
r
r
[
Figure 4-4. Audio-Output Filter, Simplified Schematic Diagram and Waveforms
4-6
[
5601"0015"1
L